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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Assets |  |  |  |
Total cash and cash equivalents | $ 194,475 | $ 144,377 | $ 143,790 | $ 121,633
Interest-earning balances due from depository institutions | 8,812 | 17,952 |  |
FHLB stock | 17,688 | 17,688 |  |
Investment securities available-for-sale | 1,806,231 | 2,080,985 |  |
Investment securities held-to-maturity | 759,029 | 829,890 |  |
Total loans, net of allowance for loan losses | 7,522,452 | 4,771,046 |  |
Deposits: |  |  |  |
Noninterest-bearing | 5,224,154 | 3,846,436 |  |
Interest-bearing | 3,885,672 | 2,700,417 |  |
Junior subordinated debentures | 25,774 | 25,774 |  |
Swaps | 400,421 | 556,984 |  |
Carrying Value [Member] |  |  |  |
Assets |  |  |  |
Total cash and cash equivalents | 194,475 | 144,377 |  |
Interest-earning balances due from depository institutions | 8,812 | 17,952 |  |
FHLB stock |  | 17,688 |  |
Investment securities available-for-sale | 1,806,231 | 2,080,985 |  |
Investment securities held-to-maturity | 759,029 | 829,890 |  |
Total loans, net of allowance for loan losses | 7,522,452 | 4,771,046 |  |
Swaps | 944 | 3,211 |  |
Deposits: |  |  |  |
Noninterest-bearing |  | 3,846,436 |  |
Interest-bearing | 3,885,672 | 2,700,417 |  |
Borrowings | 429,477 | 553,773 |  |
Junior subordinated debentures | 25,774 | 25,774 |  |
Swaps | 944 | 3,211 |  |
Estimated Fair Value [Member] |  |  |  |
Assets |  |  |  |
Total cash and cash equivalents | 194,475 | 144,377 |  |
Interest-earning balances due from depository institutions | 8,723 | 17,951 |  |
FHLB stock |  | 17,688 |  |
Investment securities available-for-sale | 1,806,231 | 2,080,985 |  |
Investment securities held-to-maturity | 726,755 | 819,215 |  |
Total loans, net of allowance for loan losses | 7,218,542 | 4,678,402 |  |
Swaps | 944 | 3,211 |  |
Deposits: |  |  |  |
Noninterest-bearing |  | 3,846,436 |  |
Interest-bearing | 3,875,171 | 2,697,781 |  |
Borrowings | 429,092 | 553,416 |  |
Junior subordinated debentures | 21,218 | 18,070 |  |
Swaps | 944 | 3,211 |  |
Estimated Fair Value [Member] | Level 1 [Member] |  |  |  |
Assets |  |  |  |
Total cash and cash equivalents | 194,475 | 144,377 |  |
Interest-earning balances due from depository institutions | 0 | 0 |  |
FHLB stock |  | 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: |  |  |  |
Noninterest-bearing |  | 3,846,436 |  |
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 | 8,723 | 17,951 |  |
FHLB stock |  | 17,688 |  |
Investment securities available-for-sale | 1,806,231 | 2,080,985 |  |
Investment securities held-to-maturity | 726,755 | 819,215 |  |
Total loans, net of allowance for loan losses | 0 | 0 |  |
Swaps | 944 | 3,211 |  |
Deposits: |  |  |  |
Noninterest-bearing |  | 0 |  |
Interest-bearing | 3,875,171 | 2,697,781 |  |
Borrowings | 429,092 | 553,416 |  |
Junior subordinated debentures | 0 | 0 |  |
Swaps | 944 | 3,211 |  |
Estimated Fair Value [Member] | Level 3 [Member] |  |  |  |
Assets |  |  |  |
Total cash and cash equivalents | 0 | 0 |  |
Interest-earning balances due from depository institutions | 0 | 0 |  |
FHLB stock |  | 0 |  |
Investment securities available-for-sale | 0 | 0 |  |
Investment securities held-to-maturity | 0 | 0 |  |
Total loans, net of allowance for loan losses | 7,218,542 | 4,678,402 |  |
Swaps | 0 | 0 |  |
Deposits: |  |  |  |
Noninterest-bearing |  | 0 |  |
Interest-bearing | 0 | 0 |  |
Borrowings | 0 | 0 |  |
Junior subordinated debentures | 21,218 | 18,070 |  |
Swaps | $ 0 | $ 0 |  |

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