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Income Taxes - Provision for Federal Income Taxes (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]                      
Federal tax based on statutory rate                 $ 7,089 $ 8,023 $ 10,242
State tax based on statutory rate                 34 82 54
(Decrease) increase resulting from:                      
NMTC                 (400) (400) 0
Effect of tax-exempt income                 (128) (171) (234)
Changes in the cash surrender value of bank owned life insurance                 (435) (138) (173)
Nondeductible merger-related expenses                 0 0 129
Nondeductible share based compensation expense                 177 191 374
Exercise of stock options                 (599) (131) (656)
DTA adjustment – impact of Tax Act                 0 (789) 2,721
Other                 122 28 36
Total income tax expense $ 1,686 $ 1,303 $ 1,555 $ 1,316 $ 616 $ 2,107 $ 2,002 $ 1,970 $ 5,860 $ 6,695 $ 12,493
Effective tax rate (percent)                 17.30% 17.50% 42.60%