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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Assets        
Total cash and cash equivalents $ 705,739 $ 185,518 $ 172,214 $ 163,948
Investment securities available-for-sale 1,679,755 1,740,257    
Investment securities held-to-maturity 642,255 674,452    
Total loans, net of allowance for loan losses 7,383,511 7,495,917    
Deposits:        
Interest-bearing 3,540,955 3,459,411    
Junior subordinated debentures 25,774 25,774    
Swaps 402,170 440,161    
Carrying Value [Member]        
Assets        
Total cash and cash equivalents 705,739 185,518    
Interest-earning balances due from depository institutions 23,799 2,931    
Investment securities available-for-sale 1,679,755 1,740,257    
Investment securities held-to-maturity 642,255 674,452    
Total loans, net of allowance for loan losses 7,383,511 7,495,917    
Swaps 33,255 11,502    
Deposits:        
Interest-bearing 3,540,955 3,459,411    
Borrowings 368,915 428,659    
Junior subordinated debentures 25,774 25,774    
Swaps 33,255 11,502    
Estimated Fair Value [Member]        
Assets        
Total cash and cash equivalents 705,739 185,518    
Interest-earning balances due from depository institutions 23,840 2,938    
Investment securities available-for-sale 1,679,755 1,740,257    
Investment securities held-to-maturity 657,819 678,948    
Total loans, net of allowance for loan losses 7,338,946 7,343,167    
Swaps 33,255 11,502    
Deposits:        
Interest-bearing 3,540,407 3,457,922    
Borrowings 368,654 428,330    
Junior subordinated debentures 13,619 20,669    
Swaps 33,255 11,502    
Estimated Fair Value [Member] | Level 1 [Member]        
Assets        
Total cash and cash equivalents 705,739 185,518    
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 23,840 2,938    
Investment securities available-for-sale 1,679,755 1,740,257    
Investment securities held-to-maturity 657,819 678,948    
Total loans, net of allowance for loan losses 0 0    
Swaps 33,255 11,502    
Deposits:        
Interest-bearing 3,540,407 3,457,922    
Borrowings 368,654 428,330    
Junior subordinated debentures 0 0    
Swaps 33,255 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 7,338,946 7,343,167    
Swaps 0 0    
Deposits:        
Interest-bearing 0 0    
Borrowings 0 0    
Junior subordinated debentures 13,619 20,669    
Swaps $ 0 $ 0