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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Assets
Total cash and cash equivalents	$ 2,561,363	$ 1,958,160	$ 1,484,953	$ 185,518
Investment securities available-for-sale	2,925,060	2,398,923
Investment securities held-to-maturity	1,710,938	578,626
Total loans, net of allowance for loan losses	7,784,156	8,255,116
Deposits:
Interest-bearing	4,619,507	4,281,114
Junior subordinated debentures	0	25,774
Swaps	675,755	469,587
Carrying Value [Member]
Assets
Total cash and cash equivalents	2,561,363	1,958,160
Interest-earning balances due from depository institutions	27,260	43,563
Investment securities available-for-sale	2,925,060	2,398,923
Investment securities held-to-maturity	1,710,938	578,626
Total loans, net of allowance for loan losses	7,784,156	8,255,116
Interest rate swaps, assets	16,176	30,181
Deposits:
Interest-bearing	4,619,507	4,281,114
Borrowings	659,579	444,406
Junior subordinated debentures	0	25,774
Swaps	16,176	30,181
Estimated Fair Value [Member]
Assets
Total cash and cash equivalents	2,561,363	1,958,160
Interest-earning balances due from depository institutions	27,260	43,600
Investment securities available-for-sale	2,925,060	2,398,923
Investment securities held-to-maturity	1,717,230	604,223
Total loans, net of allowance for loan losses	7,739,732	8,256,178
Interest rate swaps, assets	16,176	30,181
Deposits:
Interest-bearing	4,619,178	4,281,952
Borrowings	609,580	444,349
Junior subordinated debentures	0	19,431
Swaps	16,176	30,181
Estimated Fair Value [Member] | Level 1 [Member]
Assets
Total cash and cash equivalents	2,561,363	1,958,160
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
Interest rate swaps, assets	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	27,260	43,600
Investment securities available-for-sale	2,925,060	2,398,923
Investment securities held-to-maturity	1,717,230	604,223
Total loans, net of allowance for loan losses	0	0
Interest rate swaps, assets	16,176	30,181
Deposits:
Interest-bearing	4,619,178	4,281,952
Borrowings	609,580	444,349
Junior subordinated debentures	0	0
Swaps	16,176	30,181
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	7,739,732	8,256,178
Interest rate swaps, assets	0	0
Deposits:
Interest-bearing	0	0
Borrowings	0	0
Junior subordinated debentures	0	19,431
Swaps	$ 0	$ 0

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