Securities Available-for-Sale (Details) - Unrealized gains on investment securities - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Securities available-for-sale
Securities, Amortized Cost	$ 436,862	$ 401,048
Securities, Gross Unrealized Gains	11,012	4,875
Securities, Gross Unrealized Losses	(1,136)	(1,222)
Securities, Fair Value	446,738	404,701
Federal agency obligations [Member]
Securities available-for-sale
Securities, Amortized Cost	36,392	27,667
Securities, Gross Unrealized Gains	2,057	612
Securities, Gross Unrealized Losses	(1)	(42)
Securities, Fair Value	38,448	28,237
Residential mortgage pass-through securities [Member]
Securities available-for-sale
Securities, Amortized Cost	232,864	199,611
Securities, Gross Unrealized Gains	5,759	1,528
Securities, Gross Unrealized Losses	(3)	(643)
Securities, Fair Value	238,620	200,496
Commercial mortgage pass-through securities [Member]
Securities available-for-sale
Securities, Amortized Cost	2,032	4,995
Securities, Gross Unrealized Gains	160	37
Securities, Gross Unrealized Losses		(35)
Securities, Fair Value	2,192	4,997
Obligations of U.S. states and political subdivisions [Member]
Securities available-for-sale
Securities, Amortized Cost	134,413	134,500
Securities, Gross Unrealized Gains	2,829	2,411
Securities, Gross Unrealized Losses	(347)	(392)
Securities, Fair Value	136,895	136,519
Corporate bonds and notes [Member]
Securities available-for-sale
Securities, Amortized Cost	25,151	28,142
Securities, Gross Unrealized Gains	207	285
Securities, Gross Unrealized Losses	(620)	(45)
Securities, Fair Value	24,738	28,382
Asset-backed securities [Member]
Securities available-for-sale
Securities, Amortized Cost	5,526	5,845
Securities, Gross Unrealized Gains
Securities, Gross Unrealized Losses	(163)	(65)
Securities, Fair Value	5,363	5,780
Certificates of deposit [Member]
Securities available-for-sale
Securities, Amortized Cost	149	148
Securities, Gross Unrealized Gains		2
Securities, Gross Unrealized Losses	(2)
Securities, Fair Value	147	150
Other securities [Member]
Securities available-for-sale
Securities, Amortized Cost	335	140
Securities, Gross Unrealized Gains
Securities, Gross Unrealized Losses
Securities, Fair Value	$ 335	$ 140