Investment Securities - Amortized Costs, Gains and Losses, Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Amortized cost and fair value of debt securities available-for-sale
Total Amortized Cost	$ 181,354	$ 222,578
Gross Unrealized Gains	797	123
Gross Unrealized Losses	(881)	(4,496)
Fair value	181,270	218,205
U.S. Treasury
Amortized cost and fair value of debt securities available-for-sale
Total Amortized Cost	985	1,984
Gross Unrealized Gains	10	0
Gross Unrealized Losses	0	(32)
Fair value	995	1,952
U.S. government and federal agency obligations
Amortized cost and fair value of debt securities available-for-sale
Total Amortized Cost	8,495	10,235
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(30)	(269)
Fair value	8,465	9,966
Government sponsored enterprises
Amortized cost and fair value of debt securities available-for-sale
Total Amortized Cost	22,786	43,784
Gross Unrealized Gains	50	23
Gross Unrealized Losses	(38)	(472)
Fair value	22,798	43,335
Obligations of states and political subdivisions
Amortized cost and fair value of debt securities available-for-sale
Total Amortized Cost	29,341	40,859
Gross Unrealized Gains	144	28
Gross Unrealized Losses	(61)	(501)
Fair value	29,424	40,386
Mortgage-backed securities
Amortized cost and fair value of debt securities available-for-sale
Total Amortized Cost	115,261	121,230
Gross Unrealized Gains	542	72
Gross Unrealized Losses	(569)	(3,110)
Fair value	115,234	118,192
Other debt securities
Amortized cost and fair value of debt securities available-for-sale
Total Amortized Cost	3,000	3,000
Gross Unrealized Gains	51	0
Gross Unrealized Losses	0	0
Fair value	3,051	3,000
Bank issued trust preferred securities
Amortized cost and fair value of debt securities available-for-sale
Total Amortized Cost	1,486	1,486
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(183)	(112)
Fair value	$ 1,303	$ 1,374