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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Assets    
Total cash and due from banks $ 118,772 $ 119,445
Interest-earning balances due from depository institutions and federal funds sold 30,321 47,848
FHLB stock 19,640 17,688
Investment securities available-for-sale 2,271,703 2,270,466
Investment securities held-to-maturity 885,057 911,676
Total loans, net of allowance for loan losses 4,556,285 4,333,524
Deposits:    
Noninterest-bearing 3,999,107 3,673,541
Interest-bearing 2,843,706 2,636,139
Junior subordinated debentures 25,774 25,774
Swaps 569,372 608,811
Carrying Value [Member]    
Assets    
Total cash and due from banks 118,772 119,445
Interest-earning balances due from depository institutions and federal funds sold 263,669 2,188
FHLB stock 19,640 17,688
Investment securities available-for-sale 2,271,703 2,270,466
Investment securities held-to-maturity 885,057 911,676
Total loans, net of allowance for loan losses 4,556,285 4,333,524
Swaps 4,985 5,783
Deposits:    
Noninterest-bearing 3,999,107 3,673,541
Interest-bearing 2,843,706 2,636,139
Borrowings 564,387 656,028
Junior subordinated debentures 25,774 25,774
Swaps 4,985 5,783
Estimated Fair Value [Member]    
Assets    
Total cash and due from banks 118,772 119,445
Interest-earning balances due from depository institutions and federal funds sold 263,669 2,188
FHLB stock 19,640 17,688
Investment securities available-for-sale 2,271,703 2,270,466
Investment securities held-to-maturity 871,755 897,374
Total loans, net of allowance for loan losses 4,520,673 4,306,225
Swaps 4,985 5,783
Deposits:    
Noninterest-bearing 3,999,107 3,673,541
Interest-bearing 2,841,739 2,634,443
Borrowings 564,147 655,820
Junior subordinated debentures 18,913 18,463
Swaps 4,985 5,783
Estimated Fair Value [Member] | Level 1 [Member]    
Assets    
Total cash and due from banks 118,772 119,445
Interest-earning balances due from depository institutions and federal funds sold 0 0
FHLB stock 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:    
Noninterest-bearing 3,999,107 3,673,541
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 due from banks 0 0
Interest-earning balances due from depository institutions and federal funds sold 263,669 2,188
FHLB stock 19,640 17,688
Investment securities available-for-sale 2,271,703 2,270,466
Investment securities held-to-maturity 871,755 897,374
Total loans, net of allowance for loan losses 0 0
Swaps 4,985 5,783
Deposits:    
Noninterest-bearing 0 0
Interest-bearing 2,841,739 2,634,443
Borrowings 564,147 655,820
Junior subordinated debentures 0 0
Swaps 4,985 5,783
Estimated Fair Value [Member] | Level 3 [Member]    
Assets    
Total cash and due from banks 0 0
Interest-earning balances due from depository institutions and federal funds sold 0 0
FHLB stock 0 0
Investment securities available-for-sale 0 0
Investment securities held-to-maturity 0 0
Total loans, net of allowance for loan losses 4,520,673 4,306,225
Swaps 0 0
Deposits:    
Noninterest-bearing 0 0
Interest-bearing 0 0
Borrowings 0 0
Junior subordinated debentures 18,913 18,463
Swaps $ 0 $ 0