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v3.25.4

Long-Term Borrowings - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2025
Debt Instrument [Line Items] |  |  |  |
Carrying value of loans pledged as collateral for FHLB advances | $ 24,411,604,000 | $ 21,401,649,000 |  |
Unused borrowing amount |  |  |  | $ 9,192,225,000
FHLB advances | 250,000,000 | 260,199,000 |  |
Outstanding balances of debentures | $ 281,817,000 | 280,221,000 |  |
Maximum time to defer payment of interest on subordinate debt | 5 years |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | $ 250,000,000 | 260,199,000 |  |
Two Thousand And Twenty Five [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | 250,000,000 |  |  |
Long-Term Borrowings [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest paid | 23,726,000 | $ 44,911,000 | $ 84,775,000 |
Federal Home Loan Bank Borrowings [Member] | Federal Home Loan Bank Advances [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying value of loans pledged as collateral for FHLB advances | $ 8,163,013,000 |  |  |

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