Securities, Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Available for sale, amortized cost [Abstract]
Due in one year or less	$ 6,324
Due after one through five years	110,782
Due after five through ten years	284,727
Due after ten years	231,991
Amortized cost	1,461,829	$ 978,774
Available for sale, fair value [Abstract]
Due in one year or less	6,379
Due after one through five years	109,433
Due after five through ten years	282,233
Due after ten years	231,928
Fair value	1,455,429	997,261
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available for sale, amortized cost [Abstract]
Without single maturity date	733,467
Amortized cost	733,467	640,537
Available for sale, fair value [Abstract]
Without single maturity date	730,809
Fair value	730,809	651,807
Asset-backed Securities [Member]
Available for sale, amortized cost [Abstract]
Without single maturity date	94,538
Amortized cost	94,538	56,443
Available for sale, fair value [Abstract]
Without single maturity date	94,647
Fair value	$ 94,647	$ 56,245

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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