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Equity Incentive Plan - Narrative (Details) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 17, 2013	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2013	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity incentive plan name	2013 Omnibus Incentive Plan
Number of shares repurchased								846,400
Shares repurchased, amount								$ 13,297,000
Average price of shares purchased (in usd per share)								$ 15.71
Share-based compensation expense		$ 2,053,000	$ 849,000	$ 2,792,000	$ 1,637,000
Share-based compensation expense, tax related benefit		$ 698,000	$ 288,000	$ 950,000	$ 556,000
Weighted average fair value of each option granted (in usd per share)				$ 3.59
Options outstanding (in shares)		1,529,300	1,483,200	1,529,300	1,483,200	1,529,300	1,498,000		1,483,200
Remaining contractual life (years)				6 years 3 months	7 years 2 months	6 years 9 months 18 days	7 years 8 months
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized		$ 2,444,000		$ 2,444,000					$ 2,885,000
Compensation cost not yet recognized, period for recognition (in years)				10 months 21 days	1 year 3 months 16 days
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining contractual life (years)				5 years	5 years
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining contractual life (years)				7 years	7 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized, period for recognition (in years)				11 months 19 days	1 year 4 months
Compensation not yet recognized, share-based awards other than options		$ 2,230,000		$ 2,230,000					$ 3,098,000
Non-vested (in shares)		250,750	308,220	250,750	308,220	248,750	310,470		308,220
Restricted Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				5 years	5 years
Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				7 years	7 years
2013 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity incentive plan description	provides for awards of restricted stock, restricted stock units, stock options, stock appreciation rights and cash awards to directors, emeritus directors, officers, employees and advisory directors
Number of shares authorized (in shares)	2,962,400
Shares held for awards of stock options and stock appreciation rights (in shares)	2,116,000
Shares held for awards of restricted stock and restricted stock units (in shares)	846,400

X

- Definition

Description of the plan, including the basis for determining contributions, the employee groups covered, and the nature and effect of significant matters affecting comparability of information for all periods presented.

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Name of the stock option plan.

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Number of allocated shares held by the Equity Incentive Plan. Allocated shares are shares that have been assigned to individual participant accounts based on a known formula.

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Number of allocated shares held by the Equity Incentive Plan. Allocated shares are shares that have been assigned to individual participant accounts based on a known formula.

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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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Unrecognized cost of unvested share-based compensation awards.

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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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Number of options outstanding, including both vested and non-vested options.

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The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average grant-date fair value of options vested.

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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