Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Available-for-sale, amortized cost [Abstract]
Due in one year or less	$ 38,956
Due after one through five years	238,514
Due after five through ten years	273,334
Due after ten years	216,660
Amortized cost	1,486,869	$ 1,461,829
Available for sale, fair value [Abstract]
Due in one year or less	38,386
Due after one through five years	219,227
Due after five through ten years	237,002
Due after ten years	165,233
Fair value	1,298,592	1,455,429
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Without single maturity date	626,731
Amortized cost	626,731	733,467
Available for sale, fair value [Abstract]
Without single maturity date	549,039
Fair value	549,039	730,809
Asset-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Without single maturity date	92,674
Amortized cost	92,674	94,538
Available for sale, fair value [Abstract]
Without single maturity date	89,705
Fair value	$ 89,705	$ 94,647

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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