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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Assets
Total cash and cash equivalents	$ 1,484,953	$ 185,518	$ 437,548	$ 163,948
Investment securities available-for-sale	2,205,646	1,740,257
Investment securities held-to-maturity	577,694	674,452
Total loans, net of allowance for loan losses	8,314,003	7,495,917
Deposits:
Interest-bearing	4,249,411	3,459,411
Junior subordinated debentures	25,774	25,774
Swaps	520,675	440,161
Carrying Value [Member]
Assets
Total cash and cash equivalents	1,484,953	185,518
Interest-earning balances due from depository institutions	44,367	2,931
Investment securities available-for-sale	2,205,646	1,740,257
Investment securities held-to-maturity	577,694	674,452
Total loans, net of allowance for loan losses	8,314,003	7,495,917
Swaps	37,255	11,502
Deposits:
Interest-bearing	4,249,411	3,459,411
Borrowings	493,420	428,659
Junior subordinated debentures	25,774	25,774
Swaps	37,255	11,502
Estimated Fair Value [Member]
Assets
Total cash and cash equivalents	1,484,953	185,518
Interest-earning balances due from depository institutions	44,414	2,938
Investment securities available-for-sale	2,205,646	1,740,257
Investment securities held-to-maturity	603,522	678,948
Total loans, net of allowance for loan losses	8,326,796	7,343,167
Swaps	37,255	11,502
Deposits:
Interest-bearing	4,250,728	3,457,922
Borrowings	493,344	428,330
Junior subordinated debentures	18,917	20,669
Swaps	37,255	11,502
Estimated Fair Value [Member] | Level 1 [Member]
Assets
Total cash and cash equivalents	1,484,953	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	44,414	2,938
Investment securities available-for-sale	2,205,646	1,740,257
Investment securities held-to-maturity	603,522	678,948
Total loans, net of allowance for loan losses	0	0
Swaps	37,255	11,502
Deposits:
Interest-bearing	4,250,728	3,457,922
Borrowings	493,344	428,330
Junior subordinated debentures	0	0
Swaps	37,255	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	8,326,796	7,343,167
Swaps	0	0
Deposits:
Interest-bearing	0	0
Borrowings	0	0
Junior subordinated debentures	18,917	20,669
Swaps	$ 0	$ 0

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