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Bank Premises and Equipment - Components of Bank Premises and Equipment (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |
Bank premises and equipment, gross | $ 30,795 | $ 33,046
Accumulated depreciation and amortization | (21,905) | (21,821)
Total | 8,890 | 11,225
Leasehold improvements |  |
Property, Plant and Equipment [Line Items] |  |
Bank premises and equipment, gross | $ 16,020 | 17,317
Leasehold improvements | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Expected useful life (years) | 3 years |
Leasehold improvements | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Expected useful life (years) | 25 years |
Furniture, fixtures and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Bank premises and equipment, gross | $ 6,063 | 6,828
Furniture, fixtures and equipment | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Expected useful life (years) | 5 years |
Furniture, fixtures and equipment | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Expected useful life (years) | 10 years |
IT equipment |  |
Property, Plant and Equipment [Line Items] |  |
Bank premises and equipment, gross | $ 7,881 | 8,151
IT equipment | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Expected useful life (years) | 3 years |
IT equipment | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Expected useful life (years) | 5 years |
Automobiles |  |
Property, Plant and Equipment [Line Items] |  |
Bank premises and equipment, gross | $ 831 | $ 750
Automobiles | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Expected useful life (years) | 3 years |
Automobiles | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Expected useful life (years) | 5 years |

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