Investment Securities (Details) - Unrealized gains on investment securities - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	$ 401,048	$ 419,947
Investment Securities Available-for-Sale, Gross Unrealized Gains	4,875	1,297
Investment Securities Available-for-Sale, Gross Unrealized Losses	(1,222)	(9,210)
Investment Securities Available-for-Sale, Fair Value	404,701	412,034
Federal Agency Obligations [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	27,667	45,509
Investment Securities Available-for-Sale, Gross Unrealized Gains	612	51
Investment Securities Available-for-Sale, Gross Unrealized Losses	(42)	(605)
Investment Securities Available-for-Sale, Fair Value	28,237	44,955
Residential mortgage pass-through securities [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	199,611	189,721
Investment Securities Available-for-Sale, Gross Unrealized Gains	1,528	85
Investment Securities Available-for-Sale, Gross Unrealized Losses	(643)	(4,602)
Investment Securities Available-for-Sale, Fair Value	200,496	185,204
Commercial mortgage pass-through securities [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	4,995	3,919
Investment Securities Available-for-Sale, Gross Unrealized Gains	37
Investment Securities Available-for-Sale, Gross Unrealized Losses	(35)	(45)
Investment Securities Available-for-Sale, Fair Value	4,997	3,874
Obligations of U.S. states and political subdivisions [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	134,500	141,496
Investment Securities Available-for-Sale, Gross Unrealized Gains	2,411	1,091
Investment Securities Available-for-Sale, Gross Unrealized Losses	(392)	(3,402)
Investment Securities Available-for-Sale, Fair Value	136,519	139,185
Corporate Bonds And Notes [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	28,142	26,308
Investment Securities Available-for-Sale, Gross Unrealized Gains	285	45
Investment Securities Available-for-Sale, Gross Unrealized Losses	(45)	(540)
Investment Securities Available-for-Sale, Fair Value	28,382	25,813
Asset-backed Securities [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	5,845	9,685
Investment Securities Available-for-Sale, Gross Unrealized Gains		22
Investment Securities Available-for-Sale, Gross Unrealized Losses	(65)	(16)
Investment Securities Available-for-Sale, Fair Value	5,780	9,691
Certificates of Deposit [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	148	319
Investment Securities Available-for-Sale, Gross Unrealized Gains	2	3
Investment Securities Available-for-Sale, Gross Unrealized Losses
Investment Securities Available-for-Sale, Fair Value	150	322
Other Securities [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	140	2,990
Investment Securities Available-for-Sale, Gross Unrealized Gains
Investment Securities Available-for-Sale, Gross Unrealized Losses
Investment Securities Available-for-Sale, Fair Value	$ 140	$ 2,990