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Loans - Recorded Investment in Residential, Consumer and Credit Card Loans Based on Payment Activity (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount of recorded investment | $ 814,030 | $ 771,309
Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount of recorded investment | 124,785 | 86,035
Credit cards |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount of recorded investment | 7,569 | 7,623
Performing | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount of recorded investment | 809,247 | 765,823
Performing | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount of recorded investment | 123,950 | 85,322
Performing | Credit cards |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount of recorded investment | 7,567 | 7,618
Nonperforming | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount of recorded investment | 4,783 | 5,486
Nonperforming | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount of recorded investment | 835 | 713
Nonperforming | Credit cards |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount of recorded investment | $ 2 | $ 5

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