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Income Taxes - Summary of Reconciliation of Statutory Federal Tax and Effective Income Tax Rates (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Income Taxes Summary Of Reconciliation Of Statutory Federal Tax And Effective Income Tax Rates [Abstract]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%   35.00%
Reconciliation of Effective Income Tax Rates Continuing Operations      
Federal income tax expense (1) [1] $ 23,666 $ 19,778 $ 17,264
State income taxes, net of federal benefit 6,371 5,051 5,093
ESOP dividend deduction (180) (218) (173)
Other 308 768 (1,070)
Income Tax Expense from Continuing Operations $ 29,231 $ 23,538 $ 21,114
Effective Income Tax Rate from Continuing Operations 25.94% 24.99% 25.65%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation, Amount $ (15)    
Net Operating Losses and Tax Carryback $ (919) $ (1,841)  
[1] Federal income taxes were calculated at 21 percent for 2021, 2020, and 2019.