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Loans and Allowance for Loan Losses - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 28, 2021 USD ($) Loan | Apr. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) Loan | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) Loan | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) Loan | Jan. 31, 2021 USD ($) Loan
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  | $ 1,800,541,000 |  | $ 1,800,541,000 |  | $ 1,025,687,000 |
Proceeds from sale of loans held for sale |  |  |  |  | 965,119,000 | $ 652,765,000 |  |
Gain on sale of Paycheck Protection Program loans |  |  |  |  | (24,315,000) |  |  |
Nonperforming trouble debt restructuring |  |  |  |  | 235,000 |  | 142,000 |
Substandard [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  | 33,519,000 |  | 33,519,000 |  | 16,714,000 |
Troubled debt restructuring |  |  | 500,000 |  | 500,000 |  |  |
Payment Deferral [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  | $ 4,700,000 |  | $ 4,700,000 |  | $ 110,600,000 |
Number of loan deferrals | Loan |  |  | 16 |  | 16 |  | 550 |
Payment Deferral [Member] | Bay Banks [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  |  |  |  |  |  | $ 160,000,000.0
Number of loan deferrals | Loan |  |  |  |  |  |  |  | 400
PPP 1 [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |  |
Payrolls and other operating expenses |  | $ 650,000,000,000 |  |  |  |  |  |
Loans and lease receivable prior period |  | 2 years |  |  |  |  |  |
Loans and lease receivable subsequent period |  | 5 years |  |  |  |  |  |
Percentage of Loans receivable interest rate |  | 1.00% |  |  |  |  |  |
Percentage of loan earned processing fee one rate |  | 1.00% |  |  |  |  |  |
Percentage of loan earned processing fee two rate |  | 3.00% |  |  |  |  |  |
Percentage of loan earned processing fee three rate |  | 5.00% |  |  |  |  |  |
Loans and leases receivable originated |  |  |  |  |  |  | $ 363,400,000 |
Gross loans |  |  | $ 32,600,000 |  | $ 32,600,000 |  |  |
Nonrefundable fees and other costs deferred and amortized as component of loan yield over expected life of loans |  |  |  |  | 1 year 6 months |  |  |
Loans and leases receivable of processing fees, net of agent fees |  |  |  |  |  |  | 11,500,000 |
Loans and leases receivable unamortized fee |  |  | 0 |  | $ 0 |  |  |
Loans and leases receivable recognized interest income |  |  | $ 228,000 |  | $ 4,800,000 |  |  |
PPP 2 [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |  |
Percentage of Loans receivable interest rate |  |  | 1.00% |  | 1.00% |  |  |
Gross loans | $ 712,600,000 |  | $ 730,000,000 |  | $ 730,000,000 |  |  |
Number of loans | Loan |  |  |  |  | 20,000 |  |  |
Loans and lease receivable contractual term |  |  |  |  | 5 years |  |  |
Number of loans sold | Loan | 19,500 |  |  |  |  |  |  |
Proceeds from sale of loans held for sale | $ 705,900,000 |  |  |  |  |  |  |
Gain on sale of Loans | 24,300,000 |  |  |  |  |  |  |
Unamortized fees net of deferred costs and the sale discount | $ 30,900,000 |  |  |  |  |  |  |
Financing Receivable, Held-for-Sale |  |  | 14,700,000 |  | $ 14,700,000 |  |  |
Unamortized fees, net of deferred cost |  |  | 676,000 |  | 676,000 |  |  |
Loans and leases receivable of processing fees, net of agent fees |  |  | 40,800,000 |  | 40,800,000 |  |  |
Loans and leases receivable recognized interest income |  |  | 484,000 |  | $ 12,100,000 |  |  |
Gain on sale of Paycheck Protection Program loans |  |  |  | $ (30,900) |  |  |  |
PPP 2 [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |  |
Nonrefundable fees and other costs deferred and amortized as component of loan yield over expected life of loans |  |  |  |  | 3 years |  |  |
PPP 2 [Member] | Scenario One [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |  |
Processing fee for loans not more than loan balance |  |  | $ 50,000 |  | $ 50,000 |  |  |
Processing fee for loans not more than loan balance percentage |  |  | 50.00% |  | 50.00% |  |  |
Processing fee for loans balance |  |  | $ 2,500 |  | $ 2,500 |  |  |
PPP 2 [Member] | Scenario Two [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |  |
Processing fee for loans not more than loan balance |  |  | $ 350,000 |  | $ 350,000 |  |  |
Processing fee for loans not more than loan balance percentage |  |  | 5.00% |  | 5.00% |  |  |
Processing fee for loans more than loan balance |  |  | $ 50,000 |  | $ 50,000 |  |  |
PPP 2 [Member] | Scenario Three [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |  |
Processing fee for loans more than loan balance |  |  | $ 350,000 |  | $ 350,000 |  |  |
Processing fee for loans more than loan balance percentage |  |  | 3.00% |  | 3.00% |  |  |
Commercial and Residential Mortgages [Member] | FHLB [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |  |
Loans pledged |  |  | $ 517,600,000 |  | $ 517,600,000 |  | 213,300,000 |
Pay Check Protection Loans [Member] | Paycheck Protection Plan Liquidity Facility Advances [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |  |
Loans pledged |  |  | 33,900,000 |  | 33,900,000 |  | 281,600,000 |
Paycheck Protection Program [Member] |  |  |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |  |  |
Gross loans |  |  | $ 47,325,000 |  | $ 47,325,000 |  | $ 292,068,000 |

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