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Loans and Leases and the Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Loans And Leases Receivable [Line Items] |  |  |  |  |
Modified in period | $ 330,000 | $ 592,000 | $ 996,000 | $ 1,198,000 |
Amount of foreclosed residential real estate property held | 37,000 |  | 37,000 |  | $ 39,000
Loans secured by residential real estate that were in the process of foreclosure | $ 166,000 |  | $ 166,000 |  | 170,000
Percentage loans in the process of foreclosure, serviced by other entities, classified as government guaranteed | 35.00% |  | 35.00% |  |
Guaranteed by Government-Related Entities |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Modified in period | $ 33,000 | 45,000 | $ 117,000 | 92,000 |
Modified past due 30-89 days | 39,000 | 28,000 | 39,000 | 28,000 |
Modified past due 90 days or more | $ 34,000 | $ 11,000 | $ 34,000 | $ 11,000 |
Commercial Real Estate |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Weighted-average remaining term | 7 months 6 days | 1 year 3 months 18 days | 9 months 18 days | 1 year 2 months 12 days |
Commercial Real Estate | Asset Pledged as Collateral without Right |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 15,500,000 |  | $ 15,500,000 |  |
Commercial Real Estate | Asset Pledged as Collateral without Right | FHLBs Facility |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Pledged financial instruments |  |  |  |  | 16,400,000
Residential Real Estate |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Weighted-average remaining term | 9 years 1 month 6 days | 11 years 6 months | 9 years 10 months 24 days | 10 years 1 month 6 days |
Residential Real Estate | Asset Pledged as Collateral without Right |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 18,500,000 |  | $ 18,500,000 |  |
Residential Real Estate | Asset Pledged as Collateral without Right | FHLBs Facility |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Pledged financial instruments |  |  |  |  | 18,800,000
Commercial and industrial |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Modified in period | $ 117,000 | $ 41,000 | $ 270,000 | $ 127,000 |
Weighted-average remaining term | 1 year 3 months 18 days | 1 year 3 months 18 days | 1 year | 1 year 2 months 12 days |
Commercial and industrial | Asset Pledged as Collateral without Right |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 19,900,000 |  | $ 19,900,000 |  |
Commercial and industrial | Asset Pledged as Collateral without Right | FHLBs Facility |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Pledged financial instruments |  |  |  |  | 13,400,000
Commercial | Commercial Real Estate |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Mortgage loans held for sale | 716,000 |  | 716,000 |  | 189,000
Modified in period | 164,000 | $ 278,000 | 425,000 | $ 423,000 |
Residential | Residential Real Estate |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Mortgage loans held for sale | 242,000 |  | 242,000 |  | 190,000
Modified in period | 42,000 | 55,000 | 139,000 | 125,000 |
Commercial Loans and Commercial Real Estate | Minimum |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Amount of real estate loan as reported as accruing or nonaccruing | 5,000 |  | 5,000 |  |
Unfunded Loan Commitment |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Modified in period | 8,000 | 62,000 | 43,000 | 138,000 |
Home equity lines and loans | Consumer: |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Modified in period | 0 | 0 | 2,000 | 1,000 |
Home equity lines and loans | Consumer: | Asset Pledged as Collateral without Right |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,700,000 |  | 2,700,000 |  |
Home equity lines and loans | Consumer: | Asset Pledged as Collateral without Right | FHLBs Facility |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Pledged financial instruments |  |  |  |  | 2,600,000
Other | Consumer: |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Modified in period | 0 | $ 0 | 0 | $ 0 |
Other | Consumer: | Asset Pledged as Collateral without Right |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 12,700,000 |  | $ 12,700,000 |  |
Other | Consumer: | Asset Pledged as Collateral without Right | FHLBs Facility |  |  |  |  |
Loans And Leases Receivable [Line Items] |  |  |  |  |
Pledged financial instruments |  |  |  |  | $ 11,000,000

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