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Share based compensation arrangement by share based payment award earnings performance goals description.

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Stock Based Compensation [Line Items]

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Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation for stock options.

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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.

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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.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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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).

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Share-Based Compensation - Additional Information (Detail)		12 Months Ended
	Nov. 14, 2016	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 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		$ 4,246,688,000	$ 3,964,303,000
Tax benefit associated with compensation expense		53,000	114,000	$ 113,000
Total compensation cost		251,000	325,000	324,000
Total compensation cost		626,000	460,000	608,000
Cash received from option exercise		493,000	1,600,000	214,000
Actual tax benefit realized for the tax deductions		213,000	$ 522,000	$ 158,000
Unrecognized compensation cost		$ 1,500,000
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		1,556,325
Number of shares available incentive stock options \| shares		225,000
Non-option awards granted \| shares		900,000
Weighted average grant-date fair value of options granted \| $ / shares		$ 5.54	$ 4.83	$ 2.59
Option Activity Under the 2003 Plan [Member]
Stock Based Compensation [Line Items]
Maximum common shares issued under the plan \| shares		759,375
Number of shares available incentive stock options \| shares		759,375
Non-option awards granted \| shares		379,687
Additional common shares available for issuance \| shares		885,937
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		79,000	$ 47,000	$ 99,000
Total compensation cost		251,000	325,000	324,000
Total compensation cost		$ 376,000	$ 135,000	$ 284,000