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Securities - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
Debt Securities, Available-for-sale [Line Items] |  |  |
Number of securities holdings | security | 0 | 0 |
Shareholders equity, percentage | 10.00% | 10.00% |
Amortized cost | $ 533,203,000 | $ 521,337,000 |
Proceeds | 11,403,000 | 0 | $ 16,340,000
Tax provision related to net realized gains | 31,000 | 0 | 540,000
Proceeds from sale of trading securities | 301,000 | 455,000 | 1,091,000
Net realized gains on trading securities | 16,000 | 151,000 | 93,000
Realized gains on Visa Class B shares | $ 463,000 | 0 | $ 0
Other |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Number of securities holdings | security | 1 |  |
Amortized cost | $ 1,020,000 | 1,020,000 |
Pooled trust preferred |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Number of securities holdings | security |  |  | 2
Amortized cost |  |  | $ 800,000
Proceeds |  |  | $ 1,383,000
Collateral Pledged |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Securities pledged to public deposits | $ 268,447,000 | $ 290,717,000 |

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