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Loans and Leases - Narrative (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unamortized premiums | $ 16,300 | $ (1,800)
Interest receivable | 282,500 | 265,000
Loans and leases, net | $ 55,877,699 | $ 51,815,602
Prepaid expenses | Customer Concentration Risk | Loans and Finance Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration of credit risk | 39.50% | 40.70%
Commercial non-mortgage | Customer Concentration Risk | Loans and Finance Receivables |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration of credit risk | 36.00% | 34.40%
Commercial non-mortgage | Payment Delay |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Modified loans | $ 3,900 | $ 17,800
Accounts receivable | Payment Delay |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Modified loans | 16,500 |
Collateral Pledged | Commercial portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment | 308,300 | 139,500
Collateral Pledged | Consumer portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment | 28,100 | 29,100
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 | 17,200,000 |
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 | 7,200,000 |
Collateral Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Recorded investment | $ 364,300 | $ 200,100

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