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Securities - Schedule of Fair Value and Amortized Cost of Available-for-sale and Held-to-maturity Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | $ 3,470,337 | $ 2,541,107
Available-for-sale, Gross Unrealized Gains | 14,127 | 384
Available-for-sale, Gross Unrealized Losses | (216,448) | (295,419)
Available-for-sale, Fair Value | 3,268,016 | 2,246,072
Held-to-maturity, Amortized Cost | 1,150,520 | 1,152,906
Held-to-maturity, Gross Unrealized Gains | 1,442 | 164
Held-to-maturity, Gross Unrealized Losses | (109,459) | (146,253)
Held-to-maturity securities, Fair value | 1,042,503 | 1,006,817
Total debt securities, Amortized Cost | 4,620,857 | 3,694,013
Total debt securities, Gross Unrealized Gains | 15,569 | 548
Total debt securities, Gross Unrealized Losses | (325,907) | (441,672)
Total securities, Fair Value | 4,310,519 | 3,252,889
U.S. Treasury [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 195,716 | 146,113
Available-for-sale, Gross Unrealized Gains | 200 | 63
Available-for-sale, Gross Unrealized Losses |  | (63)
Available-for-sale, Fair Value | 195,916 | 146,113
U.S. Government Sponsored Entities and Agencies [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 241,932 | 224,944
Available-for-sale, Gross Unrealized Gains | 338 |
Available-for-sale, Gross Unrealized Losses | (21,980) | (30,702)
Available-for-sale, Fair Value | 220,290 | 194,242
Held-to-maturity, Amortized Cost | 2,559 | 2,988
Held-to-maturity, Gross Unrealized Losses | (157) | (260)
Held-to-maturity securities, Fair value | 2,402 | 2,728
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 2,677,573 | 1,850,284
Available-for-sale, Gross Unrealized Gains | 12,144 | 245
Available-for-sale, Gross Unrealized Losses | (188,892) | (257,088)
Available-for-sale, Fair Value | 2,500,825 | 1,593,441
Held-to-maturity, Amortized Cost | 28,369 | 32,803
Held-to-maturity, Gross Unrealized Gains | 1 |
Held-to-maturity, Gross Unrealized Losses | (1,713) | (2,754)
Held-to-maturity securities, Fair value | 26,657 | 30,049
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 145,807 | 235,873
Available-for-sale, Gross Unrealized Gains | 212 | 51
Available-for-sale, Gross Unrealized Losses | (3,182) | (4,142)
Available-for-sale, Fair Value | 142,837 | 231,782
Asset-Backed Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 70,799 |
Available-for-sale, Gross Unrealized Gains | 104 |
Available-for-sale, Gross Unrealized Losses | (143) |
Available-for-sale, Fair Value | 70,760 |
Obligations of State and Political Subdivisions [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 79,147 | 1,098,957
Available-for-sale, Gross Unrealized Gains | 289 | 164
Available-for-sale, Gross Unrealized Losses | (2,208) | (143,130)
Available-for-sale, Fair Value | 77,228 | 955,991
Held-to-maturity, Amortized Cost | 1,109,543 | 71,919
Held-to-maturity, Gross Unrealized Gains | 1,378 | 25
Held-to-maturity, Gross Unrealized Losses | (107,587) | (3,324)
Held-to-maturity securities, Fair value | 1,003,334 | 68,620
Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 59,363 | 11,974
Available-for-sale, Gross Unrealized Gains | 840 |
Available-for-sale, Gross Unrealized Losses | (43) | (100)
Available-for-sale, Fair Value | 60,160 | 11,874
Held-to-maturity, Amortized Cost | 10,049 | 18,158
Held-to-maturity, Gross Unrealized Gains | 63 |
Held-to-maturity, Gross Unrealized Losses | (2) | (109)
Held-to-maturity securities, Fair value | $ 10,110 | $ 18,049

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