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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Assets
Total cash and cash equivalents	$ 2,331,865	$ 1,958,160	$ 1,927,283	$ 185,518
Investment securities available-for-sale	2,932,021	2,398,923
Investment securities held-to-maturity	1,036,924	578,626
Total loans, net of allowance for loan losses	8,001,968	8,255,116
Deposits:
Interest-bearing	4,603,657	4,281,114
Junior subordinated debentures	0	25,774
Swaps	596,631	469,587
Carrying Value [Member]
Assets
Total cash and cash equivalents	2,331,865	1,958,160
Interest-earning balances due from depository institutions	26,258	43,563
Investment securities available-for-sale	2,932,021	2,398,923
Investment securities held-to-maturity	1,036,924	578,626
Total loans, net of allowance for loan losses	8,001,968	8,255,116
Interest rate swaps, assets	18,424	30,181
Deposits:
Interest-bearing	4,603,657	4,281,114
Borrowings	578,207	444,406
Junior subordinated debentures	0	25,774
Swaps	18,424	30,181
Estimated Fair Value [Member]
Assets
Total cash and cash equivalents	2,331,865	1,958,160
Interest-earning balances due from depository institutions	26,258	43,600
Investment securities available-for-sale	2,932,021	2,398,923
Investment securities held-to-maturity	1,055,523	604,223
Total loans, net of allowance for loan losses	8,004,132	8,256,178
Interest rate swaps, assets	18,424	30,181
Deposits:
Interest-bearing	4,603,409	4,281,952
Borrowings	499,786	444,349
Junior subordinated debentures	0	19,431
Swaps	18,424	30,181
Estimated Fair Value [Member] | Level 1 [Member]
Assets
Total cash and cash equivalents	2,331,865	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	26,258	43,600
Investment securities available-for-sale	2,932,021	2,398,923
Investment securities held-to-maturity	1,055,523	604,223
Total loans, net of allowance for loan losses	0	0
Interest rate swaps, assets	18,424	30,181
Deposits:
Interest-bearing	4,603,409	4,281,952
Borrowings	499,786	444,349
Junior subordinated debentures	0	0
Swaps	18,424	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	8,004,132	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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