Securities Available-for-Sale (Details) - Unrealized gains on investment securities - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Securities available-for-sale
Securities, Amortized Cost	$ 443,859	$ 401,048
Securities, Gross Unrealized Gains	10,054	4,875
Securities, Gross Unrealized Losses	(898)	(1,222)
Securities, Fair Value	453,015	404,701
Federal agency obligations [Member]
Securities available-for-sale
Securities, Amortized Cost	44,431	27,667
Securities, Gross Unrealized Gains	1,768	612
Securities, Gross Unrealized Losses	(54)	(42)
Securities, Fair Value	46,145	28,237
Residential mortgage pass-through securities [Member]
Securities available-for-sale
Securities, Amortized Cost	238,193	199,611
Securities, Gross Unrealized Gains	4,166	1,528
Securities, Gross Unrealized Losses	(135)	(643)
Securities, Fair Value	242,224	200,496
Commercial mortgage pass-through securities [Member]
Securities available-for-sale
Securities, Amortized Cost	6,176	4,995
Securities, Gross Unrealized Gains	213	37
Securities, Gross Unrealized Losses	(142)	(35)
Securities, Fair Value	6,247	4,997
Obligations of U.S. states and political subdivisions [Member]
Securities available-for-sale
Securities, Amortized Cost	124,790	134,500
Securities, Gross Unrealized Gains	3,649	2,411
Securities, Gross Unrealized Losses	(43)	(392)
Securities, Fair Value	128,396	136,519
Corporate bonds and notes [Member]
Securities available-for-sale
Securities, Amortized Cost	24,916	28,142
Securities, Gross Unrealized Gains	256	285
Securities, Gross Unrealized Losses	(369)	(45)
Securities, Fair Value	24,803	28,382
Asset-backed securities [Member]
Securities available-for-sale
Securities, Amortized Cost	5,023	5,845
Securities, Gross Unrealized Gains
Securities, Gross Unrealized Losses	(155)	(65)
Securities, Fair Value	4,868	5,780
Certificates of deposit [Member]
Securities available-for-sale
Securities, Amortized Cost	149	148
Securities, Gross Unrealized Gains	2	2
Securities, Gross Unrealized Losses
Securities, Fair Value	151	150
Other securities [Member]
Securities available-for-sale
Securities, Amortized Cost	181	140
Securities, Gross Unrealized Gains
Securities, Gross Unrealized Losses
Securities, Fair Value	$ 181	$ 140