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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Total cash and cash equivalents	$ 1,958,160	$ 185,518	$ 163,948	$ 144,377
Investment securities available-for-sale	2,398,923	1,740,257
Investment securities held-to-maturity	578,626	674,452
Total loans, net of allowance for loan losses	8,255,116	7,495,917
Swaps	30,181	11,502
Deposits:
Interest-bearing	4,281,114	3,459,411
Junior subordinated debentures	25,774	25,774
Swaps	469,587	440,161
Carrying Value [Member]
Assets
Total cash and cash equivalents	1,958,160	185,518
Interest-earning balances due from depository institutions	43,563	2,931
Investment securities available-for-sale	2,398,923	1,740,257
Investment securities held-to-maturity	578,626	674,452
Total loans, net of allowance for loan losses	8,255,116	7,495,917
Swaps	30,181	11,502
Deposits:
Interest-bearing	4,281,114	3,459,411
Borrowings	444,406	428,659
Junior subordinated debentures	25,774	25,774
Swaps	30,181	11,502
Estimated Fair Value [Member]
Assets
Total cash and cash equivalents	1,958,160	185,518
Interest-earning balances due from depository institutions	43,600	2,938
Investment securities available-for-sale	2,398,923	1,740,257
Investment securities held-to-maturity	604,223	678,948
Total loans, net of allowance for loan losses	8,256,178	7,343,167
Swaps	30,181	11,502
Deposits:
Interest-bearing	4,281,952	3,457,922
Borrowings	444,349	428,330
Junior subordinated debentures	19,431	20,669
Swaps	30,181	11,502
Estimated Fair Value [Member] | Level 1 [Member]
Assets
Total cash and cash equivalents	1,958,160	185,518
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	43,600	2,938
Investment securities available-for-sale	2,398,923	1,740,257
Investment securities held-to-maturity	604,223	678,948
Total loans, net of allowance for loan losses	0	0
Swaps	30,181	11,502
Deposits:
Interest-bearing	4,281,952	3,457,922
Borrowings	444,349	428,330
Junior subordinated debentures	0	0
Swaps	30,181	11,502
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	8,256,178	7,343,167
Swaps	0	0
Deposits:
Interest-bearing	0	0
Borrowings	0	0
Junior subordinated debentures	19,431	20,669
Swaps	$ 0	$ 0

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