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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets
Cash and cash equivalents	$ 318,539	$ 1,732,548
Investment securities available-for-sale	3,321,824	3,183,923
Investment securities held-to-maturity	2,557,922	1,925,970
Total loans, net of allowance for credit losses	8,691,535	7,822,694
Deposits:
Interest-bearing	5,107,843	4,872,386
Junior subordinated debentures	0	0
Interest rate swaps	467,927	656,551
Carrying Value [Member]
Assets
Cash and cash equivalents	318,539	1,732,548
Interest-earning balances due from depository institutions	7,594	25,999
Investment securities available-for-sale	3,321,824	3,183,923
Investment securities held-to-maturity	2,557,922	1,925,970
Total loans, net of allowance for credit losses	8,691,535	7,822,694
Interest rate swaps	83	14,163
Deposits:
Interest-bearing	5,107,843	4,872,386
Borrowings	467,844	644,669
Junior subordinated debentures	0	0
Interest rate swaps	83	14,163
Estimated Fair Value [Member]
Assets
Cash and cash equivalents	318,539	1,732,548
Interest-earning balances due from depository institutions	7,594	25,999
Investment securities available-for-sale	3,321,824	3,183,923
Investment securities held-to-maturity	2,150,988	1,921,693
Total loans, net of allowance for credit losses	7,981,839	7,696,210
Interest rate swaps	83	14,163
Deposits:
Interest-bearing	5,101,099	4,871,531
Borrowings	377,440	586,645
Junior subordinated debentures	0	0
Interest rate swaps	83	14,163
Estimated Fair Value [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	318,539	1,732,548
Interest-earning balances due from depository institutions		0
Investment securities available-for-sale		0
Investment securities held-to-maturity		0
Total loans, net of allowance for credit losses		0
Interest rate swaps		0
Deposits:
Interest-bearing	0	0
Borrowings		0
Junior subordinated debentures	0	0
Interest rate swaps		0
Estimated Fair Value [Member] | Level 2 [Member]
Assets
Cash and cash equivalents		0
Interest-earning balances due from depository institutions	7,594	25,999
Investment securities available-for-sale	3,321,824	3,183,923
Investment securities held-to-maturity	2,150,988	1,921,693
Total loans, net of allowance for credit losses		0
Interest rate swaps	83	14,163
Deposits:
Interest-bearing	5,101,099	4,871,531
Borrowings	377,440	586,645
Junior subordinated debentures	0	0
Interest rate swaps	83	14,163
Estimated Fair Value [Member] | Level 3 [Member]
Assets
Cash and cash equivalents		0
Interest-earning balances due from depository institutions		0
Investment securities available-for-sale		0
Investment securities held-to-maturity		0
Total loans, net of allowance for credit losses	7,981,839	7,696,210
Interest rate swaps		0
Deposits:
Interest-bearing	0	0
Borrowings		0
Junior subordinated debentures	0	0
Interest rate swaps		$ 0

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