Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 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	5,193,828	$ 4,605,954
Fair Value
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	1,000
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	1,391
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	594
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value	6,019
Available for Sale, Total debt securities	$ 5,217,278	4,581,434
Ratio of Fair Value to Amortized Cost, AFS	100.50%
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One	$ 4,384
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five	93,085
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 5 through 10	220,964
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10	1,319,880
Held to Maturity, Total Debt Securities	1,638,313
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,636,139	3,738,747
Fair Value
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	4,385
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	93,182
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	217,504
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	1,171,339
Held to Maturity, Securities, Debt Securities	1,486,410
Debt Securities, Held-to-Maturity, Fair Value	$ 3,182,394	3,185,494
Ratio of Fair Value to Amortized Cost, HTM	87.50%
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
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	307,569	324,182
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	261,038	266,353
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Amortized Cost
Available for Sale, Total debt securities	98,889	108,319
Fair Value
Available for Sale, Total debt securities	98,198	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	363	495
Fair Value
Available for Sale, Total debt securities	348	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	128,541	120,272
Fair Value
Available for Sale, Total debt securities	123,560	110,928
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	836,619	885,476
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	705,725	721,946
US Government Sponsored-Enterprise Insured Loans \| Commercial Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	18,054	18,332
Fair Value
Available for Sale, Total debt securities	16,999	17,000
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	766,482	772,456
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	649,352	623,595
Government National Mortgage Association (GNMA) [Member] \| Residential Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	4,827,672	4,236,199
Fair Value
Available for Sale, Total debt securities	4,862,225	4,227,727
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	40,301	43,693
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	37,871	39,927
Government National Mortgage Association (GNMA) [Member] \| Commercial Mortgage-Backed Securities [Member]
Amortized Cost
Available for Sale, Total debt securities	114,247	116,275
Fair Value
Available for Sale, Total debt securities	109,930	111,475
Amortized Cost
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	46,855	52,219
Fair Value
Debt Securities, Held-to-Maturity, Fair Value	$ 41,998	$ 46,032

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