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Securities - Additional Information (Detail) |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2021 USD ($) Security | Apr. 01, 2014 USD ($) Security | Dec. 31, 2021 USD ($) Security | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Number of securities | Security | 475 | 319 | 475 |  |
Aggregate fair value of securities | $ 490,200,000 | $ 167,100,000 | $ 490,200,000 |  |
Gain/Loss from net unrealized holdings, Net of tax | 6,000,000 | $ 1,300,000 | (24,117,000) | $ 24,424,000 | $ 16,693,000
Unrealized gain or loss, Held to maturity |  |  | 0 |  |
Allowance for credit losses for available for sale debt securities | 0 |  | 0 | 0 |
Accrued interest receivable on available for sale debt securities | 14,600,000 |  | 14,600,000 | 8,100,000 |
Tax effect of the proceeds from sale of securities |  |  | 192,000 | $ 902,000 | $ (16,000)
Pledged of Fair Value of Securities as collateral | 146,500,000 |  | 146,500,000 |  |
Amortization cost of securities as Collateral not Separately Reported | 145,000,000 |  | 145,000,000 |  |
Debt Instrument Repurchase Agreement | 130,800,000 |  | 130,800,000 |  |
Securities Pledged for Federal Home Loan Bank At Fair Value | 479,500,000 |  | 479,500,000 |  |
Securities for Federal Home Loan Bank Not Separately Reported | 453,600,000 |  | 453,600,000 |  |
Debt Instrument Federal Home Loan Bank | 0 |  | 0 |  |
Securities Pledged For Derivative At Fair Value | 37,200,000 |  | 37,200,000 |  |
Securities Pledged For Derivative At Amortized Cost | 36,600,000 |  | 36,600,000 |  |
Debt Instrument Derivative Swap Agreement | $ 7,200,000 |  | $ 7,200,000 |  |

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