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Share-Based Compensation - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Nov. 14, 2016 | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares
Stock Based Compensation [Line Items] |  |  |  |
Stock split ratio | 1.5 |  |  |
Share-based compensation, performance awards, performance goals description |  | The performance shares that are awarded become earned and vested based on the achievement of certain performance goals during a performance period as established by the Committee at the time of each grant. The performance goals are based on a comparison of the Company’s average performance over the performance period for the return on common equity, compounded annual growth rate of total assets, and return on average assets, all as relative to the average performance for publicly traded banks with total assets between $1 billion and $5 billion on the SNL Bank Index. Holders of performance share awards receive pass-through dividends but do not have any voting rights before the performance shares are earned and vested. |  |
Total assets |  | $ 3,964,303,000 | $ 3,141,156,000 |
Tax benefit associated with compensation expense |  | 114,000 | 113,000 | $ 101,000
Total compensation cost |  | 325,000 | 324,000 | 288,000
Total compensation cost |  | 1,700,000 | 608,000 | 643,000
Cash received from option exercise |  | 1,600,000 | 214,000 | 403,000
Actual tax benefit realized for the tax deductions |  | 522,000 | $ 158,000 | $ 151,000
Unrecognized compensation cost |  | $ 911,000 |  |
Weighted-average period cost over which cost is expected to be recognized |  | 1 year 6 months |  |
Option Activity Under the 2013 Plan [Member] |  |  |  |
Stock Based Compensation [Line Items] |  |  |  |
Maximum common shares issued under the plan | shares |  | 1,037,550 |  |
Number of shares available incentive stock options | shares |  | 150,000 |  |
Non-option awards granted | shares |  | 600,000 |  |
Weighted average grant-date fair value of options granted | $ / shares |  | $ 7.25 | $ 3.89 | $ 4.09
Option Activity Under the 2003 Plan [Member] |  |  |  |
Stock Based Compensation [Line Items] |  |  |  |
Maximum common shares issued under the plan | shares |  | 506,250 |  |
Number of shares available incentive stock options | shares |  | 506,250 |  |
Non-option awards granted | shares |  | 253,125 |  |
Additional common shares available for issuance | shares |  | 590,625 |  |
Grants vest at the end of |  | 4 years |  |
Option Activity Under the 2003 Plan [Member] | Minimum [Member] |  |  |  |
Stock Based Compensation [Line Items] |  |  |  |
Grants vest at the end of |  | 3 years |  |
Option Activity Under the 2003 Plan [Member] | Maximum [Member] |  |  |  |
Stock Based Compensation [Line Items] |  |  |  |
Grants vest at the end of |  | 5 years |  |
Performance Based Share Awards [Member] | Minimum [Member] |  |  |  |
Stock Based Compensation [Line Items] |  |  |  |
Total assets |  | $ 1,000,000,000 |  |
Performance Based Share Awards [Member] | Maximum [Member] |  |  |  |
Stock Based Compensation [Line Items] |  |  |  |
Total assets |  | 5,000,000,000 |  |
Restricted and Performance Shares [Member] |  |  |  |
Stock Based Compensation [Line Items] |  |  |  |
Tax benefit associated with compensation expense |  | 47,000 | $ 99,000 | $ 124,000
Total compensation cost |  | $ 135,000 | $ 284,000 | $ 355,000

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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