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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Assets        
Total cash and cash equivalents $ 437,548 $ 163,948 $ 194,475 $ 144,377
Investment securities available-for-sale 1,570,406 1,734,085    
Investment securities held-to-maturity 703,953 744,440    
Total loans, net of allowance for loan losses 7,425,779 7,700,998    
Deposits:        
Interest-bearing 3,409,226 3,622,703    
Junior subordinated debentures 25,774 25,774    
Swaps 424,030 444,193    
Carrying Value [Member]        
Assets        
Total cash and cash equivalents 437,548 163,948    
Interest-earning balances due from depository institutions 5,673 7,670    
Investment securities available-for-sale 1,570,406 1,734,085    
Investment securities held-to-maturity 703,953 744,440    
Total loans, net of allowance for loan losses 7,425,779 7,700,998    
Swaps 16,180 1,938    
Deposits:        
Interest-bearing 3,409,226 3,622,703    
Borrowings 412,764 722,255    
Junior subordinated debentures 25,774 25,774    
Swaps 16,180 1,938    
Estimated Fair Value [Member]        
Assets        
Total cash and cash equivalents 437,548 163,948    
Interest-earning balances due from depository institutions 5,793 7,339    
Investment securities available-for-sale 1,570,406 1,734,085    
Investment securities held-to-maturity 711,891 721,537    
Total loans, net of allowance for loan losses 7,385,760 7,514,964    
Swaps 16,180 1,938    
Deposits:        
Interest-bearing 3,407,573 3,614,682    
Borrowings 412,372 721,601    
Junior subordinated debentures 20,266 21,176    
Swaps 16,180 1,938    
Estimated Fair Value [Member] | Level 1 [Member]        
Assets        
Total cash and cash equivalents 437,548 163,948    
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 5,793 7,339    
Investment securities available-for-sale 1,570,406 1,734,085    
Investment securities held-to-maturity 711,891 721,537    
Total loans, net of allowance for loan losses 0 0    
Swaps 16,180 1,938    
Deposits:        
Interest-bearing 3,407,573 3,614,682    
Borrowings 412,372 721,601    
Junior subordinated debentures 0 0    
Swaps 16,180 1,938    
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 7,385,760 7,514,964    
Swaps 0 0    
Deposits:        
Interest-bearing 0 0    
Borrowings 0 0    
Junior subordinated debentures 20,266 21,176    
Swaps $ 0 $ 0