Securities Available-for-Sale (Details) - Unrealized gains on investment securities - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Securities available-for-sale
Securities, Amortized Cost	$ 436,834	$ 477,326
Securities, Gross Unrealized Gains	7,959	11,015
Securities, Gross Unrealized Losses	(2,770)	(386)
Securities, Fair Value	442,023	487,955
Securities, Allowance for Investment Credit Losses
Federal agency obligations [Member]
Securities available-for-sale
Securities, Amortized Cost	40,507	37,015
Securities, Gross Unrealized Gains	1,141	1,508
Securities, Gross Unrealized Losses	(347)	(65)
Securities, Fair Value	41,301	38,458
Securities, Allowance for Investment Credit Losses
Residential mortgage pass-through securities [Member]
Securities available-for-sale
Securities, Amortized Cost	238,406	266,114
Securities, Gross Unrealized Gains	3,628	4,811
Securities, Gross Unrealized Losses	(1,680)	(41)
Securities, Fair Value	240,354	270,884
Securities, Allowance for Investment Credit Losses
Commercial mortgage pass-through securities [Member]
Securities available-for-sale
Securities, Amortized Cost	6,881	6,906
Securities, Gross Unrealized Gains	35	203
Securities, Gross Unrealized Losses	(502)	(187)
Securities, Fair Value	6,414	6,922
Securities, Allowance for Investment Credit Losses
Obligations of U.S. states and political subdivisions [Member]
Securities available-for-sale
Securities, Amortized Cost	127,809	138,539
Securities, Gross Unrealized Gains	2,925	4,269
Securities, Gross Unrealized Losses	(231)
Securities, Fair Value	130,503	142,808
Securities, Allowance for Investment Credit Losses
Corporate bonds and notes [Member]
Securities available-for-sale
Securities, Amortized Cost	17,444	24,925
Securities, Gross Unrealized Gains	221	222
Securities, Gross Unrealized Losses		(52)
Securities, Fair Value	17,665	25,095
Securities, Allowance for Investment Credit Losses
Asset-backed securities [Member]
Securities available-for-sale
Securities, Amortized Cost	3,361	3,521
Securities, Gross Unrealized Gains	8
Securities, Gross Unrealized Losses	(10)	(41)
Securities, Fair Value	3,359	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, Fair Value	150	151
Securities, Allowance for Investment Credit Losses
Other securities [Member]
Securities available-for-sale
Securities, Amortized Cost	2,277	157
Securities, Gross Unrealized Gains
Securities, Gross Unrealized Losses
Securities, Fair Value	2,277	$ 157
Securities, Allowance for Investment Credit Losses