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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Assets    
Total cash and cash equivalents $ 134,686 $ 119,445
Interest-earning balances due from depository institutions 25,050 47,848
FHLB stock 17,688 17,688
Investment securities available-for-sale 2,269,510 2,270,466
Investment securities held-to-maturity 869,769 911,676
Total loans, net of allowance for loan losses 4,627,497 4,333,524
Deposits:    
Noninterest-bearing 3,929,394 3,673,541
Interest-bearing 2,767,787 2,636,139
Junior subordinated debentures 25,774 25,774
Swaps 551,233 608,811
Carrying Value [Member]    
Assets    
Total cash and cash equivalents 184,747 119,445
Interest-earning balances due from depository institutions 25,050 2,188
FHLB stock 17,688 17,688
Investment securities available-for-sale 2,269,510 2,270,466
Investment securities held-to-maturity 869,769 911,676
Total loans, net of allowance for loan losses 4,627,497 4,333,524
Swaps 5,148 5,783
Deposits:    
Noninterest-bearing 3,929,394 3,673,541
Interest-bearing 2,767,787 2,636,139
Borrowings 546,085 656,028
Junior subordinated debentures 25,774 25,774
Swaps 5,148 5,783
Estimated Fair Value [Member]    
Assets    
Total cash and cash equivalents 184,747 119,445
Interest-earning balances due from depository institutions 25,088 2,188
FHLB stock 17,688 17,688
Investment securities available-for-sale 2,269,510 2,270,466
Investment securities held-to-maturity 862,485 897,374
Total loans, net of allowance for loan losses 4,598,548 4,306,225
Swaps 5,148 5,783
Deposits:    
Noninterest-bearing 3,929,394 3,673,541
Interest-bearing 2,765,900 2,634,443
Borrowings 545,796 655,820
Junior subordinated debentures 17,235 18,463
Swaps 5,148 5,783
Estimated Fair Value [Member] | Level 1 [Member]    
Assets    
Total cash and cash equivalents 184,747 119,445
Interest-earning balances due from depository institutions 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 3,929,394 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 cash equivalents 0 0
Interest-earning balances due from depository institutions 25,088 2,188
FHLB stock 17,688 17,688
Investment securities available-for-sale 2,269,510 2,270,466
Investment securities held-to-maturity 862,485 897,374
Total loans, net of allowance for loan losses 0 0
Swaps 5,148 5,783
Deposits:    
Noninterest-bearing 0 0
Interest-bearing 2,765,900 2,634,443
Borrowings 545,796 655,820
Junior subordinated debentures 0 0
Swaps 5,148 5,783
Estimated Fair Value [Member] | Level 3 [Member]    
Assets    
Total cash and cash equivalents 0 0
Interest-earning balances due from depository institutions 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 4,598,548 4,306,225
Swaps 0 0
Deposits:    
Noninterest-bearing 0 0
Interest-bearing 0 0
Borrowings 0 0
Junior subordinated debentures 17,235 18,463
Swaps $ 0 $ 0