Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
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
Available for Sale, Total debt securities	4,789,259	$ 4,605,954
Fair Value
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	999
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	3,034
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	1,385
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	576
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	5,995
Available for Sale, Total debt securities	$ 4,796,570	4,581,434
Ratio of Fair Value to Amortized Cost, AFS	100.20%
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One	$ 11,023
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five	74,907
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10	216,847
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10	1,347,262
Held to Maturity, Total Debt Securities	1,650,039
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,705,857	3,738,747
Fair Value
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	10,999
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	74,159
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	207,000
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	1,163,656
Held to Maturity, Securities, Debt Securities	1,455,814
Debt Securities, Held-to-Maturity, Fair Value	$ 3,174,170	3,185,494
Ratio of Fair Value to Amortized Cost, HTM	85.70%
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
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	320,057	324,182
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	268,201	266,353
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Amortized Cost
Available for Sale, Total debt securities	105,633	108,319
Fair Value
Available for Sale, Total debt securities	104,774	107,839
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
Available for Sale, Total debt securities	427	495
Fair Value
Available for Sale, Total debt securities	410	471
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-Enterprise Insured Loans \| Residential Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	125,024	120,272
Fair Value
Available for Sale, Total debt securities	118,036	110,928
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	871,331	885,476
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	723,822	721,946
US Government Sponsored-Enterprise Insured Loans \| Commercial Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	18,240	18,332
Fair Value
Available for Sale, Total debt securities	16,959	17,000
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	770,177	772,456
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	640,734	623,595
Government National Mortgage Association (GNMA) [Member] \| Residential Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	4,418,218	4,236,199
Fair Value
Available for Sale, Total debt securities	4,438,964	4,227,727
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	42,972	43,693
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	39,977	39,927
Government National Mortgage Association (GNMA) [Member] \| Commercial Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	115,654	116,275
Fair Value
Available for Sale, Total debt securities	111,433	111,475
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	51,281	52,219
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	$ 45,621	$ 46,032

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