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Securities Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | $ 2,800,606 | $ 3,008,064
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 2,003 | 6,716
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 242,357 | 239,596
Fair Value | 2,560,252 | 2,775,184
Allowance for credit losses - securities held-to-maturity | (1,707) | (1,707)
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss | 2,798,899 |
Securities held-to-maturity, net of allowance for credit losses | 2,798,899 | 3,006,357
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |
Due in one year or less | 72,584 |
Due in one year to five years | 297,748 |
Due in five to ten years | 80,411 |
Due after ten years | 1,821,877 |
Mortgage-backed securities | 366,029 |
Asset-backed securities | 161,957 |
Amortized cost | 2,800,606 | 3,008,064
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |
Due in one year or less | 71,774 |
Due in one year to five years | 280,994 |
Due in five to ten years | 73,611 |
Due after ten years | 1,647,333 |
Mortgage-backed securities | 331,462 |
Asset-backed securities | 155,078 |
Fair Value | 2,560,252 | 2,775,184
Amortized Cost | 5,787,403 | 4,548,772
Gross Unrealized Gain | 16,580 | 26,982
Gross Unrealized Loss | 221,614 | 258,224
Securities available-for-sale, at fair value | 5,582,369 | 4,317,530
US Treasury Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 19,841 | 90,309
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 954 | 3,840
Fair Value | 18,887 | 86,469
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |
Amortized cost | 19,841 | 90,309
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |
Fair Value | 18,887 | 86,469
Amortized Cost | 1,419,727 | 907,990
Gross Unrealized Gain | 28 | 2
Gross Unrealized Loss | 14,277 | 14,580
Securities available-for-sale, at fair value | 1,405,478 | 893,412
U.S. Government Agency Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 315,286 | 364,769
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 13,719 | 19,187
Fair Value | 301,567 | 345,582
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |
Amortized cost | 315,286 | 364,769
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |
Fair Value | 301,567 | 345,582
Amortized Cost | 238,636 | 284,607
Gross Unrealized Gain | 2 | 0
Gross Unrealized Loss | 24,572 | 21,877
Securities available-for-sale, at fair value | 214,066 | 262,730
Mortgage-backed Agency Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 366,029 | 382,100
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 6 | 637
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 34,573 | 34,900
Fair Value | 331,462 | 347,837
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |
Amortized cost | 366,029 | 382,100
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |
Fair Value | 331,462 | 347,837
Amortized Cost | 2,068,950 | 1,071,963
Gross Unrealized Gain | 976 | 444
Gross Unrealized Loss | 107,567 | 125,017
Securities available-for-sale, at fair value | 1,962,359 | 947,390
State and Municipal Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 1,854,942 | 1,886,459
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1,956 | 6,079
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 178,744 | 159,027
Fair Value | 1,678,154 | 1,733,511
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |
Amortized cost | 1,854,942 | 1,886,459
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |
Fair Value | 1,678,154 | 1,733,511
Amortized Cost | 1,537,910 | 1,604,874
Gross Unrealized Gain | 15,382 | 26,129
Gross Unrealized Loss | 46,735 | 45,108
Securities available-for-sale, at fair value | 1,506,557 | 1,585,895
Asset-backed Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 161,957 | 198,418
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 41 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 6,920 | 14,228
Fair Value | 155,078 | 184,190
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |
Amortized cost | 161,957 | 198,418
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |
Fair Value | 155,078 | 184,190
Amortized Cost | 45,280 | 201,577
Gross Unrealized Gain | 85 | 338
Gross Unrealized Loss | 27 | 10,280
Securities available-for-sale, at fair value | 45,338 | 191,635
Corporate Debt Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost | 82,551 | 86,009
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 7,447 | 8,414
Fair Value | 75,104 | 77,595
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |
Amortized cost | 82,551 | 86,009
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |
Fair Value | 75,104 | 77,595
Amortized Cost | 476,900 | 477,761
Gross Unrealized Gain | 107 | 69
Gross Unrealized Loss | 28,436 | 41,362
Securities available-for-sale, at fair value | $ 448,571 | $ 436,468

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