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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Securities available-for-sale [Abstract] |  |
Amortized Cost | $ 5,096,189 | $ 4,548,772
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 26,574 | 26,982
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 213,796 | 258,224
Fair Value | 4,908,967 | 4,317,530
Available-for-sale, Amortized Cost [Abstract] |  |
Due in one year or less | 67,851 |
Due in one year to five years | 233,513 |
Due in five years to ten years | 438,075 |
Due after ten years | 2,727,579 |
Mortgage-backed securities | 1,500,690 |
Asset-backed securities | 128,481 |
Amortized Cost | 5,096,189 | 4,548,772
Available-for-sale, Fair Value [Abstract] |  |
Due in one year or less | 68,485 |
Due in one year to five years | 224,280 |
Due in five years to ten years | 411,348 |
Due after ten years | 2,686,586 |
Mortgage-backed securities | 1,390,181 |
Asset-backed securities | 128,087 |
Fair Value | 4,908,967 | 4,317,530
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 2,975,631 | 3,008,064
Gross Unrealized Gains | 2,550 | 6,716
Gross Unrealized Losses | 258,545 | 239,596
Fair Value | 2,719,636 | 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 | 2,973,924 | 3,006,357
Held-to-maturity, Amortized Cost [Abstract] |  |
Due in one year or less | 121,289 |
Due in one year to five years | 370,914 |
Due in five years to ten years | 66,668 |
Due after ten years | 1,852,172 |
Mortgage-backed securities | 373,826 |
Asset-backed securities | 190,762 |
Amortized Cost | 2,975,631 | 3,008,064
Held-to-maturity, Fair Value [Abstract] |  |
Due in one year or less | 119,182 |
Due in one year to five years | 347,132 |
Due in five years to ten years | 60,431 |
Due after ten years | 1,677,490 |
Mortgage-backed securities | 336,162 |
Asset-backed securities | 179,239 |
Fair Value | 2,719,636 | 2,775,184
U.S. Treasury securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,399,084 | 907,990
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 1 | 2
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 6,877 | 14,580
Fair Value | 1,392,208 | 893,412
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 1,399,084 | 907,990
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 1,392,208 | 893,412
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 90,089 | 90,309
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 2,649 | 3,840
Fair Value | 87,440 | 86,469
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 90,089 | 90,309
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 87,440 | 86,469
U.S. Government agency securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 262,915 | 284,607
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 20 | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 23,880 | 21,877
Fair Value | 239,055 | 262,730
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 262,915 | 284,607
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 239,055 | 262,730
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 365,028 | 364,769
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 19,093 | 19,187
Fair Value | 345,935 | 345,582
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 365,028 | 364,769
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 345,935 | 345,582
Mortgage-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,500,690 | 1,071,963
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 1,308 | 444
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 111,817 | 125,017
Fair Value | 1,390,181 | 947,390
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 1,500,690 | 1,071,963
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 1,390,181 | 947,390
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 373,826 | 382,100
Gross Unrealized Gains | 113 | 637
Gross Unrealized Losses | 37,777 | 34,900
Fair Value | 336,162 | 347,837
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 373,826 | 382,100
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 336,162 | 347,837
State and municipal securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,325,113 | 1,604,874
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 24,795 | 26,129
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 38,108 | 45,108
Fair Value | 1,311,800 | 1,585,895
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 1,325,113 | 1,604,874
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 1,311,800 | 1,585,895
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 1,871,366 | 1,886,459
Gross Unrealized Gains | 2,430 | 6,079
Gross Unrealized Losses | 178,688 | 159,027
Fair Value | 1,695,108 | 1,733,511
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 1,871,366 | 1,886,459
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 1,695,108 | 1,733,511
Asset-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 128,481 | 201,577
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 304 | 338
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 698 | 10,280
Fair Value | 128,087 | 191,635
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 128,481 | 201,577
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 128,087 | 191,635
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 190,762 | 198,418
Gross Unrealized Gains | 7 | 0
Gross Unrealized Losses | 11,530 | 14,228
Fair Value | 179,239 | 184,190
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 190,762 | 198,418
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 179,239 | 184,190
Corporate notes and other |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 479,906 | 477,761
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 146 | 69
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 32,416 | 41,362
Fair Value | 447,636 | 436,468
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 479,906 | 477,761
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 447,636 | 436,468
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 84,560 | 86,009
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 8,808 | 8,414
Fair Value | 75,752 | 77,595
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 84,560 | 86,009
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | $ 75,752 | $ 77,595

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