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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Assets
Total cash and cash equivalents	$ 172,214	$ 163,948	$ 456,238	$ 144,377
Interest-earning balances due from depository institutions	7,420	7,670
Investment securities available-for-sale	1,673,501	1,734,085
Investment securities held-to-maturity	733,464	744,440
Total loans, net of allowance for loan losses	7,541,662	7,700,998
Deposits:
Interest-bearing	3,555,298	3,622,703
Junior subordinated debentures	25,774	25,774
Swaps	467,192	444,193
Carrying Value [Member]
Assets
Total cash and cash equivalents	172,214	163,948
Interest-earning balances due from depository institutions	7,420	7,670
Investment securities available-for-sale	1,673,501	1,734,085
Investment securities held-to-maturity	733,464	744,440
Total loans, net of allowance for loan losses	7,541,662	7,700,998
Swaps	4,418	1,938
Deposits:
Interest-bearing	3,555,298	3,622,703
Borrowings	615,774	722,255
Junior subordinated debentures	25,774	25,774
Swaps	4,418	1,938
Estimated Fair Value [Member]
Assets
Total cash and cash equivalents	172,214	163,948
Interest-earning balances due from depository institutions	7,228	7,339
Investment securities available-for-sale	1,673,501	1,734,085
Investment securities held-to-maturity	720,651	721,537
Total loans, net of allowance for loan losses	7,506,350	7,514,964
Swaps	4,418	1,938
Deposits:
Interest-bearing	3,549,970	3,614,682
Borrowings	615,186	721,601
Junior subordinated debentures	21,016	21,176
Swaps	4,418	1,938
Estimated Fair Value [Member] | Level 1 [Member]
Assets
Total cash and cash equivalents	172,214	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	7,228	7,339
Investment securities available-for-sale	1,673,501	1,734,085
Investment securities held-to-maturity	720,651	721,537
Total loans, net of allowance for loan losses	0	0
Swaps	4,418	1,938
Deposits:
Interest-bearing	3,549,970	3,614,682
Borrowings	615,186	721,601
Junior subordinated debentures	0	0
Swaps	4,418	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	7,506,350	7,514,964
Swaps	0	0
Deposits:
Interest-bearing	0	0
Borrowings	0	0
Junior subordinated debentures	21,016	21,176
Swaps	$ 0	$ 0

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