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v3.20.4

Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) branch Segment shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 24, 2019 shares
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Number of reportable segments | Segment | 1 |  |  |
Accrued interest receivable on available-for-sale debt securities | $ 1,200,000 |  |  |
Impairment of intangible assets | 0 |  |  |
Goodwill impairment loss | 0 |  |  |
Bank-owned life insurance | $ 53,894,000 | $ 52,782,000 |  |
Stock options, expiration term from date of grant | 10 years |  |  |
Number of shares authorized for repurchase (percent) |  |  |  | 5.00%
Number of shares authorized for repurchase under program (shares) | shares |  |  |  | 1,500,000
Shares repurchased | $ 2,196,000 | 7,362,000 | $ 36,068,000 |
Increase to beginning balance of allowance for credit losses | 17,400,000 |  |  |
Decrease to beginning balance of allowance for off balance sheet items | (335,000) |  |  |
Retained earnings | 114,621,000 | $ 100,551,000 |  |
Cumulative Effect Period of Adoption Adjustment | Impact of ASU 2016-13 Adoption |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Retained earnings | $ 12,200,000 |  |  |
Stock Repurchase Program |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Shares repurchased (shares) | shares | 135,400 |  |  |
Shares repurchased | $ 2,200,000 |  |  |
Minimum |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Period of continuous service | 3 years |  |  |
Maximum |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Period of continuous service | 5 years |  |  |
Split Dollar Death Benefit Agreement |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Bank-owned life insurance | $ 3,400,000 |  |  |
Full Service |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Number of branches | branch | 35 |  |  |
Loan Production |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Number of branches | branch | 9 |  |  |

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