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Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Debt Securities, Available-for-Sale, Amortized Cost | $ 5,193,828 | $ 4,605,954
Debt Securities, Available-for-Sale | 5,217,278 | 4,581,434
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (12,346) | (30,213)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 35,796 | 5,693
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 3,636,139 | 3,738,747
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 37,331 | 42,653
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | (491,077) | (595,906)
Debt Securities, Held-to-Maturity, Fair Value | 3,182,394 | 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 | 995 | 1,000
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 19 | 0
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | 0 | (1)
Debt Securities, Held-to-Maturity, Fair Value | 1,014 | 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 | 995 | 1,000
Debt Securities, Held-to-Maturity, Fair Value | 1,014 | 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 | 3,019 | 3,005
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (45) | (58)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 1 | 0
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 1,637,318 | 1,659,722
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 1,640 | 1,122
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | (153,562) | (174,202)
Debt Securities, Held-to-Maturity, Fair Value | 1,485,396 | 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 | 3,019 | 3,005
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 1,637,318 | 1,659,662
Debt Securities, Held-to-Maturity, Fair Value | 1,485,396 | 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 | 3,019 | 3,005
Debt Securities, Held-to-Maturity, Fair Value | 1,485,396 | 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 | 307,569 | 324,182
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 7,019 | 8,135
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | (53,549) | (65,963)
Debt Securities, Held-to-Maturity, Fair Value | 261,038 | 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 | 98,889 | 108,319
Debt Securities, Available-for-Sale | 98,198 | 107,839
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (731) | (604)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 39 | 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 | 98,198 | 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 | 98,198 | 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 | 363 | 495
Debt Securities, Available-for-Sale | 348 | 471
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (15) | (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 | 348 | 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 | 348 | 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 | 3,000 | 2,989
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 0 | (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 | 128,541 | 120,272
Debt Securities, Available-for-Sale | 123,560 | 110,928
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (5,888) | (9,534)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 907 | 190
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 836,619 | 885,476
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 19,924 | 22,934
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | (150,818) | (186,464)
Debt Securities, Held-to-Maturity, Fair Value | 705,725 | 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 | 123,560 | 110,928
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 836,619 | 885,476
Debt Securities, Held-to-Maturity, Fair Value | 705,725 | 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 | 123,560 | 110,928
Debt Securities, Held-to-Maturity, Fair Value | 705,725 | 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 | 18,054 | 18,332
Debt Securities, Available-for-Sale | 16,999 | 17,000
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (1,055) | (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 | 766,482 | 772,456
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 8,503 | 10,217
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | (125,634) | (159,078)
Debt Securities, Held-to-Maturity, Fair Value | 649,352 | 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 | 16,999 | 17,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 766,482 | 772,456
Debt Securities, Held-to-Maturity, Fair Value | 649,352 | 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 | 16,999 | 17,000
Debt Securities, Held-to-Maturity, Fair Value | 649,352 | 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 | 4,827,672 | 4,236,199
Debt Securities, Available-for-Sale | 4,862,225 | 4,227,727
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (295) | (13,851)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 34,848 | 5,379
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 40,301 | 43,693
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 60 | 9
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | (2,490) | (3,774)
Debt Securities, Held-to-Maturity, Fair Value | 37,871 | 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 | 4,862,225 | 4,227,727
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 40,301 | 43,693
Debt Securities, Held-to-Maturity, Fair Value | 37,871 | 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 | 4,862,225 | 4,227,727
Debt Securities, Held-to-Maturity, Fair Value | 37,871 | 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 | 114,247 | 116,275
Debt Securities, Available-for-Sale | 109,930 | 111,475
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (4,317) | (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 | 46,855 | 52,219
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain | 166 | 236
Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | (5,023) | (6,424)
Debt Securities, Held-to-Maturity, Fair Value | 41,998 | 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 | 109,930 | 111,475
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 46,855 | 52,219
Debt Securities, Held-to-Maturity, Fair Value | 41,998 | 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 | 109,930 | 111,475
Debt Securities, Held-to-Maturity, Fair Value | $ 41,998 | $ 46,032

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