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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Securities available-for-sale [Abstract] |  |
Amortized Cost | $ 4,613,823 | $ 4,548,772
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 27,657 | 26,982
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 262,762 | 258,224
Fair Value | 4,378,718 | 4,317,530
Available-for-sale, Amortized Cost [Abstract] |  |
Due in one year or less | 27,863 |
Due in one year to five years | 241,765 |
Due in five years to ten years | 506,600 |
Due after ten years | 2,511,647 |
Mortgage-backed securities | 1,095,839 |
Asset-backed securities | 230,109 |
Amortized Cost | 4,613,823 | 4,548,772
Available-for-sale, Fair Value [Abstract] |  |
Due in one year or less | 29,143 |
Due in one year to five years | 236,003 |
Due in five years to ten years | 462,247 |
Due after ten years | 2,459,445 |
Mortgage-backed securities | 970,212 |
Asset-backed securities | 221,668 |
Fair Value | 4,378,718 | 4,317,530
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 2,994,837 | 3,008,064
Gross Unrealized Gains | 3,007 | 6,716
Gross Unrealized Losses | 264,785 | 239,596
Fair Value | 2,733,059 | 2,775,184
Allowance for credit losses - securities held-to-maturity | 1,708 | 1,707
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss | 2,993,129 | 3,006,357
Held-to-maturity, Amortized Cost [Abstract] |  |
Due in one year or less | 95,418 |
Due in one year to five years | 372,318 |
Due in five years to ten years | 91,872 |
Due after ten years | 1,859,490 |
Mortgage-backed securities | 378,228 |
Asset-backed securities | 197,511 |
Amortized Cost | 2,994,837 | 3,008,064
Held-to-maturity, Fair Value [Abstract] |  |
Due in one year or less | 92,840 |
Due in one year to five years | 347,867 |
Due in five years to ten years | 84,791 |
Due after ten years | 1,683,161 |
Mortgage-backed securities | 339,269 |
Asset-backed securities | 185,131 |
Fair Value | 2,733,059 | 2,775,184
U.S. Treasury securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 877,149 | 907,990
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 21 | 2
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 4,379 | 14,580
Fair Value | 872,791 | 893,412
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 877,149 | 907,990
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 872,791 | 893,412
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 90,199 | 90,309
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 3,415 | 3,840
Fair Value | 86,784 | 86,469
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 90,199 | 90,309
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 86,784 | 86,469
U.S. Government agency securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 316,289 | 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 | 27,476 | 21,877
Fair Value | 288,833 | 262,730
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 316,289 | 284,607
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 288,833 | 262,730
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 364,898 | 364,769
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 20,355 | 19,187
Fair Value | 344,543 | 345,582
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 364,898 | 364,769
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 344,543 | 345,582
Mortgage-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,095,839 | 1,071,963
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 544 | 444
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 126,171 | 125,017
Fair Value | 970,212 | 947,390
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 1,095,839 | 1,071,963
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 970,212 | 947,390
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 378,228 | 382,100
Gross Unrealized Gains | 175 | 637
Gross Unrealized Losses | 39,134 | 34,900
Fair Value | 339,269 | 347,837
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 378,228 | 382,100
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 339,269 | 347,837
State and municipal securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,620,208 | 1,604,874
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 26,568 | 26,129
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 53,993 | 45,108
Fair Value | 1,592,783 | 1,585,895
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 1,620,208 | 1,604,874
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 1,592,783 | 1,585,895
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 1,878,776 | 1,886,459
Gross Unrealized Gains | 2,783 | 6,079
Gross Unrealized Losses | 180,516 | 159,027
Fair Value | 1,701,043 | 1,733,511
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 1,878,776 | 1,886,459
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 1,701,043 | 1,733,511
Asset-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 230,109 | 201,577
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 452 | 338
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 8,893 | 10,280
Fair Value | 221,668 | 191,635
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 230,109 | 201,577
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 221,668 | 191,635
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 197,511 | 198,418
Gross Unrealized Gains | 49 | 0
Gross Unrealized Losses | 12,429 | 14,228
Fair Value | 185,131 | 184,190
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 197,511 | 198,418
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 185,131 | 184,190
Corporate notes and other |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 474,229 | 477,761
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 52 | 69
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 41,850 | 41,362
Fair Value | 432,431 | 436,468
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 474,229 | 477,761
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 432,431 | 436,468
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 85,225 | 86,009
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 8,936 | 8,414
Fair Value | 76,289 | 77,595
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 85,225 | 86,009
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | $ 76,289 | $ 77,595

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