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Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Available-for-sale, amortized cost [Abstract]
Due in one year or less	$ 5,945
Due after one through five years	110,913
Due after five through ten years	288,950
Due after ten years	233,478
Amortized cost	1,524,014	$ 978,774
Available for sale, fair value [Abstract]
Due in one year or less	6,032
Due after one through five years	110,757
Due after five through ten years	288,026
Due after ten years	233,151
Fair value	1,525,738	997,261
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Without single maturity date	784,733
Amortized cost	784,733	640,537
Available for sale, fair value [Abstract]
Without single maturity date	787,507
Fair value	787,507	651,807
Asset-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Without single maturity date	99,995
Amortized cost	99,995	56,443
Available for sale, fair value [Abstract]
Without single maturity date	100,265
Fair value	$ 100,265	$ 56,245

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