Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	$ 48,590	$ 51,403
State and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	11,774	20,255
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	6,054	6,371
Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	30,762	24,777
Quoted Prices in Active Markets for Identical Assets Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	0	0
Significant Other Observable Inputs Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	48,590	51,403
Significant Unobservable Inputs Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	0	0
Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	48,590	51,403
Recurring basis \| State and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	11,774	20,255
Recurring basis \| Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	6,054	6,371
Recurring basis \| Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	30,762	24,777
Recurring basis \| Quoted Prices in Active Markets for Identical Assets Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	0	0
Recurring basis \| Quoted Prices in Active Markets for Identical Assets Level 1 \| State and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	0	0
Recurring basis \| Quoted Prices in Active Markets for Identical Assets Level 1 \| Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	0	0
Recurring basis \| Quoted Prices in Active Markets for Identical Assets Level 1 \| Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	0	0
Recurring basis \| Significant Other Observable Inputs Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	48,590	51,403
Recurring basis \| Significant Other Observable Inputs Level 2 \| State and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	11,774	20,255
Recurring basis \| Significant Other Observable Inputs Level 2 \| Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	6,054	6,371
Recurring basis \| Significant Other Observable Inputs Level 2 \| Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	30,762	24,777
Recurring basis \| Significant Unobservable Inputs Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	0	0
Recurring basis \| Significant Unobservable Inputs Level 3 \| State and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	0	0
Recurring basis \| Significant Unobservable Inputs Level 3 \| Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	0	0
Recurring basis \| Significant Unobservable Inputs Level 3 \| Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in available-for-sale securities (at fair value)	$ 0	$ 0

Provident Bancorp, Inc. 10-Q