Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	$ 5,007,880	$ 4,605,954
Debt Securities, Available-for-Sale	5,036,508	4,581,434
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(14,370)	(30,213)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	42,999	5,693
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,672,161	3,738,747
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	38,157	42,653
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	(569,986)	(595,906)
Debt Securities, Held-to-Maturity, Fair Value	3,140,331	3,185,494
US Treasury Securities
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	994	1,000
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	18	0
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	0	(1)
Debt Securities, Held-to-Maturity, Fair Value	1,013	999
US Treasury Securities | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	994	1,000
Debt Securities, Held-to-Maturity, Fair Value	1,013	999
US Treasury Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Fair Value	0	0
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	3,063	3,063
Debt Securities, Available-for-Sale	2,993	3,005
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(71)	(58)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,643,021	1,659,722
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	578	1,122
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	(201,630)	(174,202)
Debt Securities, Held-to-Maturity, Fair Value	1,441,969	1,486,642
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	2,993	3,005
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,642,962	1,659,662
Debt Securities, Held-to-Maturity, Fair Value	1,441,910	1,486,582
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	2,993	3,005
Debt Securities, Held-to-Maturity, Fair Value	1,441,910	1,486,582
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	0
Debt Securities, Available-for-Sale	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	313,439	324,182
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	7,387	8,135
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	(58,290)	(65,963)
Debt Securities, Held-to-Maturity, Fair Value	262,536	266,353
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	102,177	108,319
Debt Securities, Available-for-Sale	100,489	107,839
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(1,689)	(604)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	0	123
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Debt Securities, Held-to-Maturity, Fair Value	0
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	100,489	107,839
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	100,489	107,839
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	394	495
Debt Securities, Available-for-Sale	377	471
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(17)	(24)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0
Debt Securities, Held-to-Maturity, Fair Value	0
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	377	471
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	377	471
Other Debt securities
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	3,000	3,000
Debt Securities, Available-for-Sale	2,998	2,989
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(2)	(11)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	0	0
US Government Sponsored-Enterprise Insured Loans | Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	126,138	120,272
Debt Securities, Available-for-Sale	119,914	110,928
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(6,725)	(9,534)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	500	190
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	854,777	885,476
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	20,900	22,934
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	(168,381)	(186,464)
Debt Securities, Held-to-Maturity, Fair Value	707,296	721,946
US Government Sponsored-Enterprise Insured Loans | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	119,914	110,928
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	854,777	885,476
Debt Securities, Held-to-Maturity, Fair Value	707,296	721,946
US Government Sponsored-Enterprise Insured Loans | Residential Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	119,914	110,928
Debt Securities, Held-to-Maturity, Fair Value	707,296	721,946
US Government Sponsored-Enterprise Insured Loans | Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	18,147	18,332
Debt Securities, Available-for-Sale	16,937	17,000
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(1,210)	(1,332)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	768,503	772,456
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	9,063	10,217
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	(133,145)	(159,078)
Debt Securities, Held-to-Maturity, Fair Value	644,422	623,595
US Government Sponsored-Enterprise Insured Loans | Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	16,937	17,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	768,503	772,456
Debt Securities, Held-to-Maturity, Fair Value	644,422	623,595
US Government Sponsored-Enterprise Insured Loans | Commercial Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	16,937	17,000
Debt Securities, Held-to-Maturity, Fair Value	644,422	623,595
Government National Mortgage Association (GNMA) [Member] | Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	4,640,079	4,236,199
Debt Securities, Available-for-Sale	4,682,415	4,227,727
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(162)	(13,851)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	42,498	5,379
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	42,028	43,693
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	12	9
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	(2,904)	(3,774)
Debt Securities, Held-to-Maturity, Fair Value	39,136	39,927
Government National Mortgage Association (GNMA) [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	4,682,415	4,227,727
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	42,028	43,693
Debt Securities, Held-to-Maturity, Fair Value	39,136	39,927
Government National Mortgage Association (GNMA) [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	4,682,415	4,227,727
Debt Securities, Held-to-Maturity, Fair Value	39,136	39,927
Government National Mortgage Association (GNMA) [Member] | Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost	114,881	116,275
Debt Securities, Available-for-Sale	110,386	111,475
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(4,495)	(4,800)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	49,399	52,219
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain	197	236
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss	(5,637)	(6,424)
Debt Securities, Held-to-Maturity, Fair Value	43,959	46,032
Government National Mortgage Association (GNMA) [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	110,386	111,475
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	49,399	52,219
Debt Securities, Held-to-Maturity, Fair Value	43,959	46,032
Government National Mortgage Association (GNMA) [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-Sale	110,386	111,475
Debt Securities, Held-to-Maturity, Fair Value	$ 43,959	$ 46,032