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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 | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | $ 2,874,776 | $ 3,019,695
Available-for-sale, Gross Unrealized Gains | 271 | 30,542
Available-for-sale, Gross Unrealized Losses | (345,907) | (36,775)
Available-for-sale, Estimated Fair Value | 2,529,140 | 3,013,462
Held-to-maturity, Amortized Cost | 1,248,629 | 1,004,823
Held-to-maturity, Gross Unrealized Gains | 577 | 27,153
Held-to-maturity, Gross Unrealized Losses | (164,816) | (3,524)
Held-to-maturity securities, Fair value | 1,084,390 | 1,028,452
Total securities, Amortized Cost | 4,123,405 | 4,024,518
Total securities, Gross Unrealized Gains | 848 | 57,695
Total securities, Gross Unrealized Losses | (510,723) | (40,299)
Total securities, Estimated Fair Value | 3,613,530 | 4,041,914
U.S. Government Sponsored Entities and Agencies [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 259,418 | 236,096
Available-for-sale, Gross Unrealized Gains | 2 | 3,922
Available-for-sale, Gross Unrealized Losses | (33,450) | (3,040)
Available-for-sale, Estimated Fair Value | 225,970 | 236,978
Held-to-maturity, Amortized Cost | 4,357 | 5,944
Held-to-maturity, Gross Unrealized Gains |  | 72
Held-to-maturity, Gross Unrealized Losses | (416) | (8)
Held-to-maturity securities, Fair value | 3,941 | 6,008
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 | 2,144,015 | 2,301,170
Available-for-sale, Gross Unrealized Gains | 25 | 16,489
Available-for-sale, Gross Unrealized Losses | (297,987) | (32,446)
Available-for-sale, Estimated Fair Value | 1,846,053 | 2,285,213
Held-to-maturity, Amortized Cost | 45,909 | 58,147
Held-to-maturity, Gross Unrealized Gains |  | 1,409
Held-to-maturity, Gross Unrealized Losses | (3,809) | (16)
Held-to-maturity securities, Fair value | 42,100 | 59,540
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 | 359,811 | 364,486
Available-for-sale, Gross Unrealized Gains |  | 4,252
Available-for-sale, Gross Unrealized Losses | (10,080) | (1,245)
Available-for-sale, Estimated Fair Value | 349,731 | 367,493
Obligations of State and Political Subdivisions [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 96,081 | 101,003
Available-for-sale, Gross Unrealized Gains | 244 | 5,372
Available-for-sale, Gross Unrealized Losses | (4,097) | (35)
Available-for-sale, Estimated Fair Value | 92,228 | 106,340
Held-to-maturity, Amortized Cost | 1,177,986 | 907,649
Held-to-maturity, Gross Unrealized Gains | 577 | 23,854
Held-to-maturity, Gross Unrealized Losses | (159,975) | (3,500)
Held-to-maturity securities, Fair value | 1,018,588 | 928,003
Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, Amortized Cost | 15,451 | 16,940
Available-for-sale, Gross Unrealized Gains |  | 507
Available-for-sale, Gross Unrealized Losses | (293) | (9)
Available-for-sale, Estimated Fair Value | 15,158 | 17,438
Held-to-maturity, Amortized Cost | 20,377 | 33,083
Held-to-maturity, Gross Unrealized Gains |  | 1,818
Held-to-maturity, Gross Unrealized Losses | (616) |
Held-to-maturity securities, Fair value | $ 19,761 | $ 34,901

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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