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Borrowings (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Debt Instrument [Line Items]
Long-term debt outstanding	$ 84,725	$ 94,600	$ 96,850
FHLB Advances
Debt Instrument [Line Items]
Long-term debt outstanding	$ 74,216	85,000
Weighted average rate percentage	2.35%
Trust preferred subordinated debt
Debt Instrument [Line Items]
Long-term debt outstanding	$ 5,000	5,000
Interest rate percentage	6.39%
Trust preferred subordinated debt issued	$ 5,000
Loan payable to local bank, 4.5% | Loan payable to local bank
Debt Instrument [Line Items]
Long-term debt outstanding	$ 4,509	4,600
Interest rate percentage	4.50%
Period of fixed interest rate	5 years
Loan payable to local bank, 5.25% | Loan payable to local bank
Debt Instrument [Line Items]
Long-term debt outstanding	$ 1,000	$ 0
Loan payable to local bank, 5.25% | Loan payable to local bank | Wall Street Journal Prime Rate
Debt Instrument [Line Items]
Interest rate percentage	5.30%

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