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Securities - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Reduction in securities available for sale | $ (753,781,000) | $ (634,477,000) |  |
Reduction to retained earnings | (114,621,000) | (100,551,000) |  |
Net gains (losses) in earnings resulting from sale of securities | 15,712,000 | 1,295,000 | $ (870,000) |
Net unrealized gains (losses) recorded in comprehensive income | 15,300,000 | 586,000 | (413,000) |
Gross realized losses included in earnings |  | 64,000 | 957,000 |
Gain (Loss) on Sale of Investments |  |  | (428,000) |
Available for sale securities pledged as collateral | $ 27,300,000 | $ 30,200,000 |  |
Minimum | U.S. Government and its Agencies |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Holdings of securities as percentage of share holders' equity | 10.00% |  |  |
ASU 2016-01 |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Reduction in securities available for sale |  |  |  | $ 529,000
Reduction to retained earnings |  |  |  | 382,000
Increase in net deferred tax asset |  |  |  | $ 147,000
Net unrealized gains (losses) recorded in comprehensive income |  |  | $ (529,000) |

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