Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Available-for-sale, amortized cost [Abstract]
Due in one year or less	$ 47,754
Due after one through five years	245,157
Due after five through ten years	280,613
Due after ten years	230,442
Amortized cost	1,588,129	$ 1,461,829
Available for sale, fair value [Abstract]
Due in one year or less	47,673
Due after one through five years	235,839
Due after five through ten years	263,396
Due after ten years	207,485
Fair value	1,503,165	1,455,429
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Without single maturity date	690,098
Amortized cost	690,098	733,467
Available for sale, fair value [Abstract]
Without single maturity date	655,213
Fair value	655,213	730,809
Asset-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Without single maturity date	94,065
Amortized cost	94,065	94,538
Available for sale, fair value [Abstract]
Without single maturity date	93,559
Fair value	$ 93,559	$ 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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