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Securities - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) security | Dec. 31, 2016 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 | $ 521,337,000 | $ 409,110,000 |
Proceeds | 0 | 16,340,000 | $ 4,420,000
Tax provision related to net realized gains | 0 | 540,000 | 352,000
Proceeds from sale of trading securities | 455,000 | 1,091,000 | 540,000
Net realized gains on trading securities | 151,000 | $ 93,000 | $ 70,000
Pooled trust preferred |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Number of securities holdings | security |  | 2 | 2
Amortized cost |  | $ 800,000 | $ 0
Proceeds |  | 1,383,000 | $ 922,000
Collateral Pledged |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Securities pledged to public deposits | $ 290,717,000 | $ 319,575,000 |

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