Investment Securities (Details) - Unrealized gains on investment securities - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Securities available-for-sale
Securities, Amortized Cost	$ 460,847	$ 477,326
Securities, Gross Unrealized Gains	5,631	11,015
Securities, Gross Unrealized Losses	(3,594)	(386)
Securities available-for-sale	462,884	487,955
Securities, Allowance for Investment Credit Losses
Federal agency obligations [Member]
Securities available-for-sale
Securities, Amortized Cost	50,016	37,015
Securities, Gross Unrealized Gains	1,032	1,508
Securities, Gross Unrealized Losses		(65)
Securities available-for-sale	51,048	38,458
Securities, Allowance for Investment Credit Losses
Residential mortgage pass-through securities [Member]
Securities available-for-sale
Securities, Amortized Cost	255,488	266,114
Securities, Gross Unrealized Gains	2,640	4,811
Securities, Gross Unrealized Losses	(2,073)	(41)
Securities available-for-sale	256,055	270,884
Securities, Allowance for Investment Credit Losses
Commercial mortgage pass-through securities [Member]
Securities available-for-sale
Securities, Amortized Cost	10,859	6,906
Securities, Gross Unrealized Gains	135	203
Securities, Gross Unrealized Losses	(468)	(187)
Securities available-for-sale	10,526	6,922
Securities, Allowance for Investment Credit Losses
Obligations of U.S. states and political subdivisions [Member]
Securities available-for-sale
Securities, Amortized Cost	129,632	138,539
Securities, Gross Unrealized Gains	1,693	4,269
Securities, Gross Unrealized Losses	(1,051)
Securities available-for-sale	130,274	142,808
Securities, Allowance for Investment Credit Losses
Corporate bonds and notes [Member]
Securities available-for-sale
Securities, Amortized Cost	10,965	24,925
Securities, Gross Unrealized Gains	124	222
Securities, Gross Unrealized Losses		(52)
Securities available-for-sale	11,089	25,095
Securities, Allowance for Investment Credit Losses
Asset-backed securities [Member]
Securities available-for-sale
Securities, Amortized Cost	2,718	3,521
Securities, Gross Unrealized Gains	6
Securities, Gross Unrealized Losses	(2)	(41)
Securities available-for-sale	2,722	3,480
Securities, Allowance for Investment Credit Losses
Certificates of deposit [Member]
Securities available-for-sale
Securities, Amortized Cost	149	149
Securities, Gross Unrealized Gains	1	2
Securities, Gross Unrealized Losses
Securities available-for-sale	150	151
Securities, Allowance for Investment Credit Losses
Other securities [Member]
Securities available-for-sale
Securities, Amortized Cost	1,020	157
Securities, Gross Unrealized Gains
Securities, Gross Unrealized Losses
Securities available-for-sale	1,020	$ 157
Securities, Allowance for Investment Credit Losses