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Business Combinations - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed at Date of Acquisition (Detail) - USD ($) $ in Thousands | Jan. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets acquired: |  |  |
Bank owned life insurance |  | $ 221,190 | $ 134,847
Liabilities assumed: |  |  |
Goodwill recorded in the merger |  | $ 338,104 | $ 150,501
Sun Bancorp, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Total Purchase Price: | $ 474,930 |  |
Assets acquired: |  |  |
Cash and cash equivalents | 68,632 |  |
Securities | 254,522 |  |
Loans | 1,517,172 |  |
Accrued interest receivable | 5,621 |  |
Bank owned life insurance | 85,238 |  |
Deferred tax asset | 57,712 |  |
Other assets | 42,105 |  |
Total assets acquired | 2,042,899 |  |
Liabilities assumed: |  |  |
Deposits | (1,616,073) |  |
Borrowings | (127,747) |  |
Other liabilities | (11,752) |  |
Total liabilities assumed | (1,755,572) |  |
Net assets acquired | 287,327 |  |
Goodwill recorded in the merger | $ 187,603 |  |

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- Definition The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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