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Fair Values of Financial Instruments - Carrying Amount and Fair Value of Company's Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial assets:    
Securities held-to-maturity $ 2,351,120 $ 2,046,647
Loans 2,396,534 2,257,035
Financial liabilities:    
Time deposits 555,447 560,579
Other borrowed funds 370,955 202,378
Subordinated debentures 36,083 36,083
Carrying Value [Member]    
Financial assets:    
Securities held-to-maturity 2,351,120 2,046,647
Loans [1] 2,396,534 2,257,035
Financial liabilities:    
Time deposits 555,447 560,579
Other borrowed funds 370,955 202,378
Subordinated debentures 36,083 36,083
Estimated Fair Value [Member]    
Financial assets:    
Securities held-to-maturity 2,361,304 1,991,421
Loans [1] 2,424,770 2,279,712
Financial liabilities:    
Time deposits 560,746 559,988
Other borrowed funds 374,531 203,122
Subordinated debentures 36,083 36,083
Fair Value Measurements, Level 2 Inputs [Member]    
Financial assets:    
Securities held-to-maturity 2,361,304 1,991,421
Financial liabilities:    
Time deposits 560,746 559,988
Other borrowed funds 374,531 203,122
Subordinated debentures 36,083 36,083
Fair Value Measurements, Level 3 Inputs [Member]    
Financial assets:    
Loans [1] $ 2,424,770 $ 2,279,712
[1] Comprised of loans (including collateral dependent impaired loans), net of deferred loan costs and the allowance for loan losses.