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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Assets        
Total cash and cash equivalents $ 1,927,283 $ 185,518 $ 175,840 $ 163,948
Investment securities available-for-sale 1,676,067 1,740,257    
Investment securities held-to-maturity 613,169 674,452    
Total loans, net of allowance for loan losses 8,308,551 7,495,917    
Deposits:        
Interest-bearing 4,082,212 3,459,411    
Junior subordinated debentures 25,774 25,774    
Swaps 506,782 440,161    
Carrying Value [Member]        
Assets        
Total cash and cash equivalents 1,927,283 185,518    
Interest-earning balances due from depository institutions 38,611 2,931    
Investment securities available-for-sale 1,676,067 1,740,257    
Investment securities held-to-maturity 613,169 674,452    
Total loans, net of allowance for loan losses 8,308,551 7,495,917    
Swaps 38,626 11,502    
Deposits:        
Interest-bearing 4,082,212 3,459,411    
Borrowings 478,156 428,659    
Junior subordinated debentures 25,774 25,774    
Swaps 38,626 11,502    
Estimated Fair Value [Member]        
Assets        
Total cash and cash equivalents 1,927,283 185,518    
Interest-earning balances due from depository institutions 38,667 2,938    
Investment securities available-for-sale 1,676,067 1,740,257    
Investment securities held-to-maturity 638,950 678,948    
Total loans, net of allowance for loan losses 8,252,796 7,343,167    
Swaps 38,626 11,502    
Deposits:        
Interest-bearing 4,083,910 3,457,922    
Borrowings 478,056 428,330    
Junior subordinated debentures 17,284 20,669    
Swaps 38,626 11,502    
Estimated Fair Value [Member] | Level 1 [Member]        
Assets        
Total cash and cash equivalents 1,927,283 185,518    
Interest-earning balances due from depository institutions 0 0    
Investment securities available-for-sale 0 0    
Investment securities held-to-maturity 0 0    
Total loans, net of allowance for loan losses 0 0    
Swaps 0 0    
Deposits:        
Interest-bearing 0 0    
Borrowings 0 0    
Junior subordinated debentures 0 0    
Swaps 0 0    
Estimated Fair Value [Member] | Level 2 [Member]        
Assets        
Total cash and cash equivalents 0 0    
Interest-earning balances due from depository institutions 38,667 2,938    
Investment securities available-for-sale 1,676,067 1,740,257    
Investment securities held-to-maturity 638,950 678,948    
Total loans, net of allowance for loan losses 0 0    
Swaps 38,626 11,502    
Deposits:        
Interest-bearing 4,083,910 3,457,922    
Borrowings 478,056 428,330    
Junior subordinated debentures 0 0    
Swaps 38,626 11,502    
Estimated Fair Value [Member] | Level 3 [Member]        
Assets        
Total cash and cash equivalents 0 0    
Interest-earning balances due from depository institutions 0 0    
Investment securities available-for-sale 0 0    
Investment securities held-to-maturity 0 0    
Total loans, net of allowance for loan losses 8,252,796 7,343,167    
Swaps 0 0    
Deposits:        
Interest-bearing 0 0    
Borrowings 0 0    
Junior subordinated debentures 17,284 20,669    
Swaps $ 0 $ 0