Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Available-for-sale, amortized cost [Abstract]
Due in one year or less	$ 4,702
Due after one through five years	88,689
Due after five through ten years	222,741
Due after ten years	186,585
Amortized cost	1,346,551	$ 978,774
Available for sale, fair value [Abstract]
Due in one year or less	4,765
Due after one through five years	88,977
Due after five through ten years	223,840
Due after ten years	189,690
Fair value	1,357,597	997,261
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Without single maturity date	751,580
Amortized cost	751,580	640,537
Available for sale, fair value [Abstract]
Without single maturity date	757,750
Fair value	757,750	651,807
Other Debt Securities [Member]
Available-for-sale, amortized cost [Abstract]
Without single maturity date	92,254
Amortized cost	92,254	56,443
Available for sale, fair value [Abstract]
Without single maturity date	92,575
Fair value	$ 92,575	$ 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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