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Business Combinations - Additional Information (Detail) |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 10, 2018 USD ($) Branch | Mar. 10, 2017 USD ($) Branch | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition date |  |  |  |  | Oct. 16, 2009 |  |
Goodwill |  |  | $ 662,888,000 |  | $ 662,888,000 |  | $ 116,564,000
Merger related expenses |  |  | 6,645,000 | $ 250,000 | $ 7,942,000 | $ 2,176,000 |
Valley Commerce Bancorp [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition date |  |  |  |  | Mar. 10, 2017 |  |
Acquired assets and assumed liabilities for cash |  | $ 23,200,000 |  |  |  |  |
Assets and assumed all of the liabilities, stock |  | 37,600,000 |  |  |  |  |
Goodwill |  | 27,000,000 |  |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, intangible assets, other than goodwill |  | 3,200,000 |  |  |  |  |
Merger related expenses |  |  |  | $ 250,000.0 | $ 0 | $ 2,200,000 |
Total fair value of assets acquired |  | 405,900,000 |  |  |  |  |
Cash and cash equivalents |  | 28,300,000 |  |  |  |  |
FHLB stock |  | 2,000,000 |  |  |  |  |
Loans and lease finance receivables |  | 309,700,000 |  |  |  |  |
Fixed assets |  | 5,300,000 |  |  |  |  |
Bank-Owned Life Insurance |  | 9,400,000 |  |  |  |  |
Other assets |  | 21,000,000 |  |  |  |  |
Total fair value of liabilities assumed |  | 368,300,000 |  |  |  |  |
Deposits |  | 361,800,000 |  |  |  |  |
Other liabilities |  | $ 6,500,000 |  |  |  |  |
Valley Business Bank [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of branches owned by merger company | Branch |  | 4 |  |  |  |  |
Community Bank [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition date |  |  |  |  | Aug. 10, 2018 |  |
Number of branches owned by merger company | Branch | 16 |  |  |  |  |  |
Acquired assets and assumed liabilities for cash | $ 180,719,000 |  |  |  |  |  |
Assets and assumed all of the liabilities, stock | 722,800,000 |  |  |  |  |  |
Goodwill | 546,324,000 |  |  |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, intangible assets, other than goodwill | $ 52,200,000 |  |  |  |  |  |
Percentage of core deposits to total deposits | 2.26% |  |  |  |  |  |
Merger related expenses |  |  | $ 6,600,000 |  | $ 7,900,000 |  |
Total fair value of assets acquired | $ 3,719,911,000 |  |  |  |  |  |
Cash and cash equivalents | 47,802,000 |  |  |  |  |  |
FHLB stock | 17,250,000 |  |  |  |  |  |
Loans and lease finance receivables | 2,734,081,000 |  |  |  |  |  |
Bank-Owned Life Insurance | 70,904,000 |  |  |  |  |  |
Other assets | 58,130,000 |  |  |  |  |  |
Total fair value of liabilities assumed | 357,162,000 |  |  |  |  |  |
Deposits | 2,869,986,000 |  |  |  |  |  |
Other liabilities | $ 29,192,000 |  |  |  |  |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + 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 (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + 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 (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + 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 (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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