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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 | Mar. 31, 2025 | Dec. 31, 2024
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | $ 3,407,093 | $ 2,541,107
Available-for-sale, Gross Unrealized Gains | 2,421 | 384
Available-for-sale, Gross Unrealized Losses | (260,471) | (295,419)
Available-for-sale, Fair Value | 3,149,043 | 2,246,072
Held-to-maturity, Amortized Cost | 1,143,376 | 1,152,906
Held-to-maturity, Gross Unrealized Gains | 204 | 164
Held-to-maturity, Gross Unrealized Losses | (140,784) | (146,253)
Held-to-maturity securities, Fair value | 1,002,796 | 1,006,817
Total debt securities, Amortized Cost | 4,550,469 | 3,694,013
Total debt securities, Gross Unrealized Gains | 2,625 | 548
Total debt securities, Gross Unrealized Losses | (401,255) | (441,672)
Total securities, Fair Value | 4,151,839 | 3,252,889
U.S. Treasury [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 195,423 | 146,113
Available-for-sale, Gross Unrealized Gains | 76 | 63
Available-for-sale, Gross Unrealized Losses | (45) | (63)
Available-for-sale, Fair Value | 195,454 | 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 | 234,563 | 224,944
Available-for-sale, Gross Unrealized Gains | 38 |
Available-for-sale, Gross Unrealized Losses | (25,724) | (30,702)
Available-for-sale, Fair Value | 208,877 | 194,242
Held-to-maturity, Amortized Cost | 2,923 | 2,988
Held-to-maturity, Gross Unrealized Losses | (203) | (260)
Held-to-maturity securities, Fair value | 2,720 | 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 | 2,599,877 | 1,850,284
Available-for-sale, Gross Unrealized Gains | 2,107 | 245
Available-for-sale, Gross Unrealized Losses | (227,802) | (257,088)
Available-for-sale, Fair Value | 2,374,182 | 1,593,441
Held-to-maturity, Amortized Cost | 31,354 | 32,803
Held-to-maturity, Gross Unrealized Losses | (2,236) | (2,754)
Held-to-maturity securities, Fair value | 29,118 | 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 | 165,312 | 235,873
Available-for-sale, Gross Unrealized Gains | 48 | 51
Available-for-sale, Gross Unrealized Losses | (3,522) | (4,142)
Available-for-sale, Fair Value | 161,838 | 231,782
Asset-Backed Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 70,422 |
Available-for-sale, Gross Unrealized Gains | 46 |
Available-for-sale, Gross Unrealized Losses | (73) |
Available-for-sale, Fair Value | 70,395 |
Obligations of State and Political Subdivisions [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 85,868 | 71,919
Available-for-sale, Gross Unrealized Gains | 36 | 25
Available-for-sale, Gross Unrealized Losses | (3,202) | (3,324)
Available-for-sale, Fair Value | 82,702 | 68,620
Held-to-maturity, Amortized Cost | 1,093,002 | 1,098,957
Held-to-maturity, Gross Unrealized Gains | 176 | 164
Held-to-maturity, Gross Unrealized Losses | (138,283) | (143,130)
Held-to-maturity securities, Fair value | 954,895 | 955,991
Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 55,628 | 11,974
Available-for-sale, Gross Unrealized Gains | 70 |
Available-for-sale, Gross Unrealized Losses | (103) | (100)
Available-for-sale, Fair Value | 55,595 | 11,874
Held-to-maturity, Amortized Cost | 16,097 | 18,158
Held-to-maturity, Gross Unrealized Gains | 28 |
Held-to-maturity, Gross Unrealized Losses | (62) | (109)
Held-to-maturity securities, Fair value | $ 16,063 | $ 18,049

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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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