Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Amortized Cost
Available for Sale, Due in one year or less	$ 2,000
Available for Sale, Due after one year through five years	51,062
Available for Sale, Due after five years through ten years	45,931
Available for Sale, Due after ten years	26,868
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	125,862
Available for Sale, Total debt securities	4,102,470	$ 3,749,814
Fair Value
Available for Sale, Due in one year or less	1,983
Available for Sale, Due after one year through five years	45,997
Available for Sale, Due after five years through ten years	42,937
Available for Sale, Due after ten years	26,201
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	117,118
Available for Sale, Total debt securities	$ 3,912,730	3,600,892
Available for Sale, Ratio of Fair Value to Amortized Cost	95.40%
Amortized Cost
Held to Maturity, Due in one year or less	$ 6,288
Held to Maturity, Due after one year through five years	61,651
Held to Maturity, Due after five years through ten years	175,169
Held to Maturity, Due after ten years	1,426,386
Held to Maturity, Total Debt Securities	1,669,494
Held to Maturity, Amortized Cost	3,799,119	3,860,235
Fair Value
Held to Maturity, Due in one year or less	6,240
Held to Maturity, Due after one year through five years	60,374
Held to Maturity, Due after five years through ten years	166,153
Held to Maturity, Due after ten years	1,265,882
Held to Maturity, Securities, Debt Securities	1,498,648
Held to Maturity, Total debt securities at fair value	$ 3,246,952	3,380,624
Held to Maturity, Ratio of Fair Value to Amortized Cost	85.50%
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Amortized Cost
Available for Sale, Total debt securities	$ 0
Fair Value
Available for Sale, Total debt securities	0
Amortized Cost
Held to Maturity, Amortized Cost	335,148	345,083
Fair Value
Held to Maturity, Total debt securities at fair value	273,892	289,507
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Amortized Cost
Available for Sale, Total debt securities	123,720	135,832
Fair Value
Available for Sale, Total debt securities	122,765	133,975
Amortized Cost
Held to Maturity, Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities at fair value	0
US Government-sponsored Enterprises Debt Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	667	1,077
Fair Value
Available for Sale, Total debt securities	640	1,051
Amortized Cost
Held to Maturity, Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities at fair value	0
US Government Sponsored-Enterprise Insured Loans \| Residential Related Securities
Amortized Cost
Available for Sale, Total debt securities	1,224,824	1,274,052
Fair Value
Available for Sale, Total debt securities	1,064,318	1,120,794
Amortized Cost
Held to Maturity, Amortized Cost	916,966	941,973
Fair Value
Held to Maturity, Total debt securities at fair value	753,657	804,393
US Government Sponsored-Enterprise Insured Loans \| Commercial mortgage-related securities
Amortized Cost
Available for Sale, Total debt securities	18,513	18,691
Fair Value
Available for Sale, Total debt securities	17,283	16,937
Amortized Cost
Held to Maturity, Amortized Cost	776,717	780,995
Fair Value
Held to Maturity, Total debt securities at fair value	630,783	632,914
Government National Mortgage Association (GNMA) [Member] \| Residential Related Securities
Amortized Cost
Available for Sale, Total debt securities	2,450,628	2,021,242
Fair Value
Available for Sale, Total debt securities	2,440,808	2,042,675
Amortized Cost
Held to Maturity, Amortized Cost	46,392	48,979
Fair Value
Held to Maturity, Total debt securities at fair value	42,536	46,170
Government National Mortgage Association (GNMA) [Member] \| Commercial mortgage-related securities
Amortized Cost
Available for Sale, Total debt securities	158,257	161,928
Fair Value
Available for Sale, Total debt securities	149,799	154,793
Amortized Cost
Held to Maturity, Amortized Cost	54,403	59,733
Fair Value
Held to Maturity, Total debt securities at fair value	$ 47,436	$ 52,619

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