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Securities - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2014 USD ($) Security | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Unrealized loss, other than temporary securities |  | $ 0 |  |
Number of securities | Security | 319 |  |  |
Aggregate fair value of securities | $ 167,100,000 |  |  |
Gain/Loss from net unrealized holdings, Net of tax | $ 1,300,000 | (3,802,000) | $ 1,180,000 | $ (4,927,000)
Unrealized gain or loss, Held to maturity |  | 0 |  |
Tax effect of the proceeds from sale of securities |  | (93,000) | $ 13,000 | $ 643,000
Pledged of Fair Value of Securities as collateral |  | 58,800,000 |  |
Amortization cost of securities as Collateral not Separately Reported |  | 60,700,000 |  |
Debt Instrument Repurchase Agreement |  | 52,100,000 |  |
Securities Pledged for Federal Home Loan Bank At Fair Value |  | 96,200,000 |  |
Securities for Federal Home Loan Bank Not Separately Reported |  | 95,900,000 |  |
Securities Pledged For Derivative At Fair Value |  | 11,100,000 |  |
Securities Pledged For Derivative At Amortized Cost |  | 11,200,000 |  |
Debt Instrument Derivative Swap Agreement |  | 1,800,000 |  |
Debt Instrument Federal Home Loan Bank |  | $ 0 |  |

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