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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Securities available-for-sale [Abstract] |  |
Amortized Cost | $ 6,599,728 | $ 5,787,403
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 18,638 | 16,580
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 206,560 | 221,614
Fair Value | 6,411,806 | 5,582,369
Available-for-sale, Amortized Cost [Abstract] |  |
Due in one year or less | 254,717 |
Due in one year to five years | 153,534 |
Due in five years to ten years | 343,759 |
Due after ten years | 3,163,467 |
Mortgage-backed securities | 2,684,056 |
Asset-backed securities | 195 |
Amortized Cost | 6,599,728 | 5,787,403
Available-for-sale, Fair Value [Abstract] |  |
Due in one year or less | 254,763 |
Due in one year to five years | 148,861 |
Due in five years to ten years | 329,620 |
Due after ten years | 3,060,177 |
Mortgage-backed securities | 2,618,190 |
Asset-backed securities | 195 |
Fair Value | 6,411,806 | 5,582,369
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 2,646,509 | 2,800,606
Gross Unrealized Gains | 1,330 | 2,003
Gross Unrealized Losses | 215,771 | 242,357
Fair Value | 2,432,068 | 2,560,252
Allowance for credit losses - securities held-to-maturity | 1,707 | 1,707
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss | 2,644,802 | 2,798,899
Held-to-maturity, Amortized Cost [Abstract] |  |
Due in one year or less | 19,912 |
Due in one year to five years | 301,156 |
Due in five years to ten years | 69,337 |
Due after ten years | 1,782,718 |
Mortgage-backed securities | 352,571 |
Asset-backed securities | 120,815 |
Amortized Cost | 2,646,509 | 2,800,606
Held-to-maturity, Fair Value [Abstract] |  |
Due in one year or less | 19,464 |
Due in one year to five years | 292,411 |
Due in five years to ten years | 64,814 |
Due after ten years | 1,604,758 |
Mortgage-backed securities | 332,646 |
Asset-backed securities | 117,975 |
Fair Value | 2,432,068 | 2,560,252
U.S. Treasury securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,606,437 | 1,419,727
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 46 | 28
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 12,925 | 14,277
Fair Value | 1,593,558 | 1,405,478
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 1,606,437 | 1,419,727
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 1,593,558 | 1,405,478
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 19,912 | 19,841
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 448 | 954
Fair Value | 19,464 | 18,887
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 19,912 | 19,841
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 19,464 | 18,887
U.S. Government agency securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 219,925 | 238,636
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 18 | 2
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 16,127 | 24,572
Fair Value | 203,816 | 214,066
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 219,925 | 238,636
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 203,816 | 214,066
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 255,676 | 315,286
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 6,440 | 13,719
Fair Value | 249,236 | 301,567
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 255,676 | 315,286
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 249,236 | 301,567
Mortgage-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 2,684,056 | 2,068,950
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 12,604 | 976
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 78,470 | 107,567
Fair Value | 2,618,190 | 1,962,359
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 2,684,056 | 2,068,950
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 2,618,190 | 1,962,359
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 352,571 | 366,029
Gross Unrealized Gains | 530 | 6
Gross Unrealized Losses | 20,455 | 34,573
Fair Value | 332,646 | 331,462
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 352,571 | 366,029
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 332,646 | 331,462
State and municipal securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 1,774,299 | 1,537,910
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 3,994 | 15,382
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 87,755 | 46,735
Fair Value | 1,690,538 | 1,506,557
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 1,774,299 | 1,537,910
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 1,690,538 | 1,506,557
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 1,828,121 | 1,854,942
Gross Unrealized Gains | 778 | 1,956
Gross Unrealized Losses | 181,161 | 178,744
Fair Value | 1,647,738 | 1,678,154
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 1,828,121 | 1,854,942
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 1,647,738 | 1,678,154
Asset-backed securities |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 195 | 45,280
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 85
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 27
Fair Value | 195 | 45,338
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 195 | 45,280
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 195 | 45,338
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 120,815 | 161,957
Gross Unrealized Gains | 22 | 41
Gross Unrealized Losses | 2,862 | 6,920
Fair Value | 117,975 | 155,078
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 120,815 | 161,957
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | 117,975 | 155,078
Corporate notes and other |  |
Securities available-for-sale [Abstract] |  |
Amortized Cost | 314,816 | 476,900
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax | 1,976 | 107
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | 11,283 | 28,436
Fair Value | 305,509 | 448,571
Available-for-sale, Amortized Cost [Abstract] |  |
Amortized Cost | 314,816 | 476,900
Available-for-sale, Fair Value [Abstract] |  |
Fair Value | 305,509 | 448,571
Securities held-to-maturity [Abstract] |  |
Amortized Cost | 69,414 | 82,551
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 4,405 | 7,447
Fair Value | 65,009 | 75,104
Held-to-maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 69,414 | 82,551
Held-to-maturity, Fair Value [Abstract] |  |
Fair Value | $ 65,009 | $ 75,104

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- Definition Represents amount of available-for-sale debt securities at cost, net of adjustment of asset-backed securities. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References No definition available. + Details
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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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