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Investment Securities - Summary of Amortized Cost and Estimated Fair Values of Available for Sale Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 3,264,860 | $ 3,282,690
Gross Unrealized Gains | 11,231 | 966
Gross Unrealized Losses | 216,639 | 323,937
Allowance For Credit Losses | 0 | 0
Estimated Fair Value | 3,059,452 | 2,959,719
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 283,058 | 248,867
Gross Unrealized Gains | 75 | 59
Gross Unrealized Losses | 1,476 | 3,084
Allowance For Credit Losses | 0 | 0
Estimated Fair Value | 281,657 | 245,842
State and Political Subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 572,217 | 574,580
Gross Unrealized Gains | 343 | 8
Gross Unrealized Losses | 55,634 | 79,515
Allowance For Credit Losses | 0 | 0
Estimated Fair Value | 516,926 | 495,073
Residential mortgage-backed securities Agency [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,467,436 | 1,226,400
Gross Unrealized Gains | 5,517 | 433
Gross Unrealized Losses | 114,317 | 167,114
Allowance For Credit Losses | 0 | 0
Estimated Fair Value | 1,358,636 | 1,059,719
Residential Mortgage-Backed Securities, Non-agency [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 42,792 | 88,392
Gross Unrealized Gains | 330 | 262
Gross Unrealized Losses | 4,237 | 6,531
Allowance For Credit Losses | 0 | 0
Estimated Fair Value | 38,885 | 82,123
Commercial Mortgage-Backed Securities Agency [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 416,177 | 372,646
Gross Unrealized Gains | 4,948 | 38
Gross Unrealized Losses | 26,052 | 42,698
Allowance For Credit Losses | 0 | 0
Estimated Fair Value | 395,073 | 329,986
Asset-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 225,617 | 476,863
Gross Unrealized Gains | 18 | 166
Gross Unrealized Losses | 2,381 | 2,047
Allowance For Credit Losses | 0 | 0
Estimated Fair Value | 223,254 | 474,982
Single Issue Trust Preferred Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 13,319 | 13,296
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 661 | 1,377
Allowance For Credit Losses | 0 | 0
Estimated Fair Value | 12,658 | 11,919
Other Corporate Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 244,244 | 281,646
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 11,881 | 21,571
Allowance For Credit Losses | 0 | 0
Estimated Fair Value | $ 232,363 | $ 260,075

X
- 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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