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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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