Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Available-for-sale, amortized cost [Abstract]
Due in one year or less	$ 44,996
Due after one through five years	236,828
Due after five through ten years	275,428
Due after ten years	229,278
Amortized cost	1,534,312	$ 1,461,829
Available for sale, fair value [Abstract]
Due in one year or less	44,674
Due after one through five years	224,810
Due after five through ten years	251,091
Due after ten years	188,928
Fair value	1,402,127	1,455,429
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Without single maturity date	654,315
Amortized cost	654,315	733,467
Available for sale, fair value [Abstract]
Without single maturity date	601,568
Fair value	601,568	730,809
Asset-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Without single maturity date	93,467
Amortized cost	93,467	94,538
Available for sale, fair value [Abstract]
Without single maturity date	91,056
Fair value	$ 91,056	$ 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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