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Business Combinations - Additional Information (Detail) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 10, 2018 USD ($) Branch | Mar. 10, 2017 USD ($) Branch | Feb. 29, 2016 USD ($) Branch | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition date |  |  |  | Oct. 16, 2009 |  |
Goodwill |  |  |  | $ 666,539,000 | $ 116,564,000 | $ 89,533,000
Merger related expenses |  |  |  | $ 16,404,000 | 2,251,000 | $ 1,897,000
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 |  |  |  |
Core deposit intangible assets |  | 3,200,000 |  |  |  |
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 |  |  |  |
Merger related expenses |  |  |  | $ 0 | 2,100,000 |
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 | 722,767,000 |  |  |  |  |
Goodwill | 549,975,000 |  |  |  |  |
Core deposit intangible assets | $ 52,200,000 |  |  |  |  |
Percentage of core deposits to total deposits | 2.26% |  |  |  |  |
Total fair value of assets acquired | $ 3,716,260,000 |  |  |  |  |
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 | 54,479,000 |  |  |  |  |
Total fair value of liabilities assumed | 353,511,000 |  |  |  |  |
Deposits | 2,869,986,000 |  |  |  |  |
Other liabilities | 29,192,000 |  |  |  |  |
Merger related expenses |  |  |  | $ 16,400,000 |  |
FHLB advances | 166,000,000 |  |  |  |  |
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 |  |  |  |  |
County Commerce Bank [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition date |  |  |  | Feb. 29, 2016 |  |
Number of branches owned by merger company | Branch |  |  | 4 |  |  |
Acquired assets and assumed liabilities for cash |  |  | $ 20,600,000 |  |  |
Assets and assumed all of the liabilities, stock |  |  | 21,600,000 |  |  |
Goodwill |  |  | 15,300,000 |  |  |
Core deposit intangible assets |  |  | 3,900,000 |  |  |
Total fair value of assets acquired |  |  | 252,400,000 |  |  |
Cash and cash equivalents |  |  | 54,800,000 |  |  |
FHLB stock |  |  | 1,500,000 |  |  |
Loans and lease finance receivables |  |  | 168,000,000 |  |  |
Fixed assets |  |  | 8,600,000 |  |  |
Other assets |  |  | 289,000 |  |  |
Total fair value of liabilities assumed |  |  | 230,800,000 |  |  |
Deposits |  |  | 224,200,000 |  |  |
Other liabilities |  |  | 1,600,000 |  |  |
Merger related expenses |  |  |  | $ 0 | $ 145,000 |
FHLB advances |  |  | $ 5,000,000 |  |  |

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- Definition Business combination recognized identifiable assets acquired and liabilities assumed bank owned life insurance. + References No definition available. + Details
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- Definition Business combination recognized identifiable assets acquired and liabilities assumed premium paid. + References No definition available. + Details
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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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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, 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)(2) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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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 equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + 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 The amount of inventory recognized as of 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=108330185&loc=d3e2207-128464 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=108330185&loc=d3e2207-128464 Reference 2: 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 long-term debt due after one year or the normal operating cycle, if longer, assumed 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 liabilities due after one year or the normal operating cycle, if longer, assumed 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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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=108330185&loc=d3e2207-128464 Reference 2: 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 after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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