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Business Combinations - Additional Information (Detail) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Aug. 10, 2018 USD ($) Branch | Jun. 30, 2019 USD ($) Branch | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) Branch | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | $ 663,707,000 |  | $ 663,707,000 |  | $ 666,539,000
Merger related expenses |  | $ 2,612,000 | $ 494,000 | $ 5,761,000 | $ 1,297,000 |
Community Bank [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition date |  |  |  | Aug. 10, 2018 |  |
Number of branches owned by merger company | Branch | 16 | 10 |  | 10 |  |
Acquired assets and assumed liabilities for cash | $ 180,719,000 |  |  |  |  |
Assets and assumed all of the liabilities, stock | 722,767,000 |  |  |  |  |
Goodwill | 547,144,000 |  |  |  |  |
Core deposit intangible assets | $ 52,200,000 |  |  |  |  |
Percentage of core deposits to total deposits | 2.26% |  |  |  |  |
Merger related expenses |  | $ 2,600,000 | $ 494,000 | $ 5,800,000 | $ 1,300,000 |
Gross contractual amount receivable, as of acquisition date | $ 3,000,000,000 |  |  |  |  |
Contractual principal cash flows, loans not expected to be collected | $ 4,500,000 |  |  |  |  |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e848-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e845-128460 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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