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Loans and Leases - Narrative (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unamortized premiums | $ (1,800) | $ (33,800) |
Interest receivable | 265,000 | 270,400 |
Loans and leases, net | 51,815,602 | 50,090,315 |
Interest on non-accrual loans that would have been recorded as additional interest income | $ 45,400 | $ 22,900 | $ 16,900
Number of Contracts | loan |  |  | 107
Funds held in escrow |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Modified loans |  |  | $ 3,600
Number of Contracts | loan |  |  | 3
Residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Modified loans |  |  | $ 600
Number of Contracts | loan |  |  | 2
Other consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Modified loans |  |  | $ 300
Number of Contracts | loan |  |  | 2
Commercial portfolio |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Write-down of TDR's |  |  | $ 14,700
Consumer portfolio |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Write-down of TDR's |  |  | $ 300
Consumer portfolio | Residential | Term Extension |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Contracts | loan |  |  | 2
Prepaid expenses | Customer Concentration Risk | Loans and Finance Receivables |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Concentration of credit risk | 40.70% | 41.70% |
Commercial non-mortgage | Customer Concentration Risk | Loans and Finance Receivables |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Concentration of credit risk | 34.40% | 33.30% |
Commercial non-mortgage | Term Extension |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Modified loans | $ 17,800 |  |
Collateral Pledged | Commercial portfolio |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recorded investment | 139,500 | $ 66,100 |
Collateral Pledged | Consumer portfolio |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recorded investment | 29,100 | 22,700 |
Collateral Pledged | Asset Pledged as Collateral | Federal Home Loan Bank Certificates and Obligations (FHLB) |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases, net | 17,900,000 |  |
Collateral Pledged | Asset Pledged as Collateral | Federal Reserve Bank Certificates And Obligations (FRB) |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases, net | 2,900,000 |  |
Collateral Value |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recorded investment | $ 200,100 | $ 93,700 |

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