Fair Value Measurements - Narrative (Details)	Jun. 30, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO	$ 2,912,000	$ 585,000
Number of loans in foreclosure process \| loan	3	3
Secured mortgage loan, real estate value	$ 598,000	$ 598,000
(Level 3) Significant Unobservable Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 securities	0	0
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO	2,912,000	585,000
Fair Value, Measurements, Nonrecurring \| (Level 3) Significant Unobservable Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO	$ 2,912,000	$ 585,000
Measurement Input, Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO, measurement input		0.0950
Measurement Input, Discount Rate [Member] \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO, measurement input	0.0669
Measurement Input, Discount Rate [Member] \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO, measurement input	0.2546
Measurement Input, Discount Rate [Member] \| Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO, measurement input	0.0800

TWO RIVER BANCORP 10-Q