Other Borrowings - Summary of Federal Home Loan Bank Advances Classified as Short Term (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Federal Home Loan Bank, Advances [Line Items]
FHLB advances fixed rate	$ 38,000
1.28% Fixed Rate Advances Due 2017 [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank Advances Maturity Year	2017
FHLB advances fixed rate	$ 5,000
FHLB advances fixed interest rate	1.28%
1.29% Fixed Rate Advances Due 2017 [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank Advances Maturity Year	2017
FHLB advances fixed rate	$ 5,000
FHLB advances fixed interest rate	1.29%
0.84% Fixed Rate Advances Due 2017 [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank Advances Maturity Year	2017
FHLB advances fixed rate	$ 8,000
FHLB advances fixed interest rate	0.84%
0.93% Fixed Rate Advances Due 2017 [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank Advances Maturity Year	2017
FHLB advances fixed rate	$ 10,000
FHLB advances fixed interest rate	0.93%
1.06% Fixed Rate Advances Due 2017 [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank Advances Maturity Year	2017
FHLB advances fixed rate	$ 10,000
FHLB advances fixed interest rate	1.06%

Sunshine Bancorp, Inc. 10-Q