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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets        
Total cash and cash equivalents $ 185,518 $ 163,948 $ 144,377 $ 121,633
Investment securities available-for-sale 1,740,257 1,734,085    
Investment securities held-to-maturity 674,452 744,440    
Total loans, net of allowance for loan losses 7,495,917 7,700,998    
Swaps 11,502 1,938    
Deposits:        
Interest-bearing 3,459,411 3,622,703    
Junior subordinated debentures 25,774 25,774    
Swaps 440,161 444,193    
Carrying Value [Member]        
Assets        
Total cash and cash equivalents 185,518 163,948    
Interest-earning balances due from depository institutions 2,931 7,670    
Investment securities available-for-sale 1,740,257 1,734,085    
Investment securities held-to-maturity 674,452 744,440    
Total loans, net of allowance for loan losses 7,495,917 7,700,998    
Swaps 11,502 1,938    
Deposits:        
Interest-bearing 3,459,411 3,622,703    
Borrowings 428,659 722,255    
Junior subordinated debentures 25,774 25,774    
Swaps 11,502 1,938    
Estimated Fair Value [Member]        
Assets        
Total cash and cash equivalents 185,518 163,948    
Interest-earning balances due from depository institutions 2,938 7,339    
Investment securities available-for-sale 1,740,257 1,734,085    
Investment securities held-to-maturity 678,948 721,537    
Total loans, net of allowance for loan losses 7,343,167 7,514,964    
Swaps 11,502 1,938    
Deposits:        
Interest-bearing 3,457,922 3,614,682    
Borrowings 428,330 721,601    
Junior subordinated debentures 20,669 21,176    
Swaps 11,502 1,938    
Estimated Fair Value [Member] | Level 1 [Member]        
Assets        
Total cash and cash equivalents 185,518 163,948    
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 2,938 7,339    
Investment securities available-for-sale 1,740,257 1,734,085    
Investment securities held-to-maturity 678,948 721,537    
Total loans, net of allowance for loan losses 0 0    
Swaps 11,502 1,938    
Deposits:        
Interest-bearing 3,457,922 3,614,682    
Borrowings 428,330 721,601    
Junior subordinated debentures 0 0    
Swaps 11,502 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 7,343,167 7,514,964    
Swaps 0 0    
Deposits:        
Interest-bearing 0 0    
Borrowings 0 0    
Junior subordinated debentures 20,669 21,176    
Swaps $ 0 $ 0