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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Assets
Total cash and cash equivalents	$ 175,840	$ 163,948	$ 181,489	$ 144,377
Interest-earning balances due from depository institutions	6,425	7,670
Investment securities available-for-sale	1,600,020	1,734,085
Investment securities held-to-maturity	728,113	744,440
Total loans, net of allowance for loan losses	7,468,558	7,700,998
Deposits:
Interest-bearing	3,412,588	3,622,703
Junior subordinated debentures	25,774	25,774
Swaps	432,015	444,193
Carrying Value [Member]
Assets
Total cash and cash equivalents	175,840	163,948
Interest-earning balances due from depository institutions	6,425	7,670
Investment securities available-for-sale	1,600,020	1,734,085
Investment securities held-to-maturity	728,113	744,440
Total loans, net of allowance for loan losses	7,468,558	7,700,998
Swaps	10,744	1,938
Deposits:
Interest-bearing	3,412,588	3,622,703
Borrowings	421,271	722,255
Junior subordinated debentures	25,774	25,774
Swaps	10,744	1,938
Estimated Fair Value [Member]
Assets
Total cash and cash equivalents	175,840	163,948
Interest-earning balances due from depository institutions	6,295	7,339
Investment securities available-for-sale	1,600,020	1,734,085
Investment securities held-to-maturity	729,032	721,537
Total loans, net of allowance for loan losses	7,433,835	7,514,964
Swaps	10,744	1,938
Deposits:
Interest-bearing	3,409,516	3,614,682
Borrowings	420,841	721,601
Junior subordinated debentures	20,703	21,176
Swaps	10,744	1,938
Estimated Fair Value [Member] | Level 1 [Member]
Assets
Total cash and cash equivalents	175,840	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	6,295	7,339
Investment securities available-for-sale	1,600,020	1,734,085
Investment securities held-to-maturity	729,032	721,537
Total loans, net of allowance for loan losses	0	0
Swaps	10,744	1,938
Deposits:
Interest-bearing	3,409,516	3,614,682
Borrowings	420,841	721,601
Junior subordinated debentures	0	0
Swaps	10,744	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	7,433,835	7,514,964
Swaps	0	0
Deposits:
Interest-bearing	0	0
Borrowings	0	0
Junior subordinated debentures	20,703	21,176
Swaps	$ 0	$ 0

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