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Income Taxes - Reconciliation From Statutory Rate to Effective Tax (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]                      
Tax expense at statutory rates                 $ 26,786 $ 30,889 $ 30,223
Increase (decrease) in taxes resulting from:                      
State tax, net of federal income tax benefit                 7,400 8,197 1,002
Tax-exempt interest income                 (2,609) (3,082) (2,839)
Bank-owned life insurance                 (1,363) (1,322) (1,158)
Other, net                 389 (227) (1,698)
Income tax expense (benefit) $ 12,346 $ 9,285 $ 3,715 $ 5,257 $ 8,026 $ 9,938 $ 8,802 $ 7,689 $ 30,603 $ 34,455 $ 25,530