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Acquisition Activity - Additional Information (Detail) - USD ($) |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 23, 2017 | Sep. 30, 2017 | Mar. 31, 2018 | Oct. 20, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |
Share price |  |  |  | $ 42.00 |
Total assets |  | $ 1,587,361,632 |  |  | $ 1,556,732,033
Deposits |  | 1,319,712,786 |  |  | $ 1,248,072,453
Pre-tax merger-related expenses |  | $ 247,000 |  |  |
St Martin Bancshares [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Shares of common stock issued in merger | 9.2839 |  |  |  |
Cash distribution per share | $ 94.00 |  |  |  |
Stock consideration and special distribution, per share | $ 483.92 |  |  |  |
Stock consideration and special distribution, value | $ 100,400,000 |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total assets |  |  | $ 2,200,000,000 |  |
Loans |  |  | 1,700,000,000 |  |
Deposits |  |  | $ 1,800,000,000 |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + 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://www.xbrl.org/2003/role/presentationRef -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 consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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