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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets    
Total cash and cash equivalents $ 119,841 $ 119,445
Interest-earning balances due from depository institutions 17,952 47,848
FHLB stock 17,688 17,688
Investment securities available-for-sale 2,080,985 2,270,466
Investment securities held-to-maturity 829,890 911,676
Total loans, net of allowance for loan losses 4,771,046 4,333,524
Swaps 3,211 5,783
Deposits:    
Noninterest-bearing 3,846,436 3,673,541
Interest-bearing 2,700,417 2,636,139
Junior subordinated debentures 25,774 25,774
Swaps 556,984 608,811
Carrying Value [Member]    
Assets    
Total cash and cash equivalents 144,377 121,633
Interest-earning balances due from depository institutions 17,952 47,848
FHLB stock 17,688 17,688
Investment securities available-for-sale 2,080,985 2,270,466
Investment securities held-to-maturity 829,890 911,676
Total loans, net of allowance for loan losses 4,771,046 4,333,524
Swaps 3,211 5,783
Deposits:    
Noninterest-bearing 3,846,436 3,673,541
Interest-bearing 2,700,417 2,636,139
Borrowings 553,773 656,028
Junior subordinated debentures 25,774 25,774
Swaps 3,211 5,783
Estimated Fair Value [Member]    
Assets    
Total cash and cash equivalents 144,377 121,633
Interest-earning balances due from depository institutions 17,951 47,848
FHLB stock 17,688 17,688
Investment securities available-for-sale 2,080,985 2,270,466
Investment securities held-to-maturity 819,215 897,374
Total loans, net of allowance for loan losses 4,678,402 4,306,225
Swaps 3,211 5,783
Deposits:    
Noninterest-bearing 3,846,436 3,673,541
Interest-bearing 2,697,781 2,634,443
Borrowings 553,416 655,820
Junior subordinated debentures 18,070 18,463
Swaps 3,211 5,783
Estimated Fair Value [Member] | Level 1 [Member]    
Assets    
Total cash and cash equivalents 144,377 121,633
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 3,846,436 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 17,951 47,848
FHLB stock 17,688 17,688
Investment securities available-for-sale 2,080,985 2,270,466
Investment securities held-to-maturity 819,215 897,374
Total loans, net of allowance for loan losses 0 0
Swaps 3,211 5,783
Deposits:    
Noninterest-bearing 0 0
Interest-bearing 2,697,781 2,634,443
Borrowings 553,416 655,820
Junior subordinated debentures 0 0
Swaps 3,211 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 4,678,402 4,306,225
Swaps 0 0
Deposits:    
Noninterest-bearing 0 0
Interest-bearing 0 0
Borrowings 0 0
Junior subordinated debentures 18,070 18,463
Swaps $ 0 $ 0