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Securities - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) Holding | Dec. 31, 2021 USD ($) Holding | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |  |  |
Maximum percentage of equity of one issuer | 10.00% |  |  |
Number of holdings greater than specified percentage of equity | Holding | 0 | 0 |  |
Equities securities | $ 11,506,000 | $ 13,466,000 |  |
Other Assets | 358,122,000 | 215,298,000 |  |
Proceeds from sale of available-for-sale securities |  |  | $ 226,099,000 |
Net unrealized gains (losses) on available-for-sale securities included in AOCI | 261,800,000 | 4,700,000 | 46,900,000 |
Current expected credit losses to opening retained earnings | 2,426,662,000 | 2,693,166,000 | 2,756,737,000 | $ 2,593,921,000
Accrued interest receivable | 68,522,000 | 60,844,000 |  |
Federal home loan bank stock, Total | 36,200,000 | 15,900,000 |  |
Asset Pledged as Security |  |  |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |  |  |
Other Assets | 2,100,000,000 | 2,100,000,000 |  |
Held-to-maturity Securities [Member] |  |  |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |  |  |
Accrued interest receivable | 9,500,000 | 7,000,000.0 |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |  |  |
Current expected credit losses to opening retained earnings |  |  |  | (26,591,000)
Retained Earnings [Member] |  |  |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |  |  |
Current expected credit losses to opening retained earnings | 1,077,675,000 | 977,765,000 | 831,688,000 | 824,694,000
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |  |  |
Current expected credit losses to opening retained earnings |  |  |  | $ (26,591,000)
Us Government Securities and Mortgage Backed and Collateralized Securities Issued By Direct Governmental Entity or Government-Sponsored Entity [Member] |  |  |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |  |  |
Estimated credit losses | 0 |  |  |
ASU 2016-13 [Member] |  |  |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |  |  |
Estimated credit losses | 48,000 | $ 58,000 | $ (97,000) |
Grantor Trusts [Member] |  |  |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |  |  |
Equities securities | $ 9,000,000.0 |  |  |

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