Investment Securities, AFS and HTM Expected Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	$ 1,000
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	3,040
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	1,390
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10	633
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	6,063
Debt Securities, Available-for-Sale, Amortized Cost, Total	4,605,954	$ 3,749,814
Fair Value
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	997
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	3,026
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	1,387
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	585
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	5,994
Total debt securities, AFS Fair Value	$ 4,581,434	3,600,892
Ratio of Fair Value to Amortized Cost, AFS	99.50%
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One	$ 17,800
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five	62,054
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10	187,803
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10	1,393,065
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost	1,660,722
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,738,747	3,860,235
Fair Value
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	17,746
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	61,286
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	179,653
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	1,228,957
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value	1,487,641
Debt Securities, Held-to-Maturity, Fair Value	$ 3,185,494	3,380,624
Ratio of Fair Value to Amortized Cost, HTM	85.20%
Residential Mortgage-Backed Securities [Member] \| US Government Sponsored-Enterprise Insured Loans [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	$ 120,272	1,274,052
Fair Value
Total debt securities, AFS Fair Value	110,928	1,120,794
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	885,476	941,973
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	721,946	804,393
Residential Mortgage-Backed Securities [Member] \| Government National Mortgage Association (GNMA) [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	4,236,199	2,021,242
Fair Value
Total debt securities, AFS Fair Value	4,227,727	2,042,675
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	43,693	48,979
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	39,927	46,170
Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	0
Fair Value
Total debt securities, AFS Fair Value	0
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	324,182	345,083
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	266,353	289,507
Commercial Mortgage-Backed Securities [Member] \| US Government Sponsored-Enterprise Insured Loans [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	18,332	18,691
Fair Value
Total debt securities, AFS Fair Value	17,000	16,937
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	772,456	780,995
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	623,595	632,914
Commercial Mortgage-Backed Securities [Member] \| Government National Mortgage Association (GNMA) [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	116,275	161,928
Fair Value
Total debt securities, AFS Fair Value	111,475	154,793
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	52,219	59,733
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	46,032	52,619
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	108,319	135,832
Fair Value
Total debt securities, AFS Fair Value	107,839	133,975
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	0
US Government-sponsored Enterprises Debt Securities [Member]
Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Total	495	1,077
Fair Value
Total debt securities, AFS Fair Value	471	$ 1,051
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	$ 0

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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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