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Employee Benefit Plans - Activity of Restricted Stock Awards (Detail) - Restricted Stock Awards [Member] - $ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Number of Shares, Beginning of period 111,131 88,226 88,450
Number of Shares, Granted 56,496 48,750 37,382
Number of Shares, Vested (30,675) (23,270) (35,431)
Number of Shares, Forfeited (8,000) (2,575) (2,175)
Number of Shares, Nonvested, end of period 128,952 111,131 88,226
Weighted average fair value per award, Beginning of period $ 23.02 $ 28.40 $ 31.52
Weighted average fair value per award, Granted 30.46 22.70 21.80
Weighted average fair value per award, Vested 24.77 42.03 29.27
Weighted average fair value per award, Forfeited 30.15 24.28 21.92
Weighted average fair value per award, Nonvested, end of period $ 25.75 $ 23.02 $ 28.40