Employee Benefits - Equity Incentive Plans (Details) $ in Thousands				3 Months Ended
	Jun. 30, 2010 shares	May 18, 2007 shares	Jun. 21, 2006 shares	Mar. 31, 2017 USD ($) item shares	Mar. 31, 2016 USD ($)	Dec. 31, 2016 shares	Jul. 28, 2014 shares
Employee Benefits
Number of stock option plans frozen | item				2
Share-based Compensation | $				$ 535	$ 305
Percentage of participant's contribution matched by Company				100.00%
Company contributions | $				$ 356	326
Restricted Stock Units (RSUs)
Employee Benefits
Units outstanding				284,750
Total stock-based compensation expense | $				$ 210	$ 212
Employee And Directors Time Based Options
Employee Benefits
Options outstanding						377,015
Employee And Directors Performance Options
Employee Benefits
Options outstanding						1,020,242
2014 Plan
Employee Benefits
Options outstanding				387,333		389,500
2014 Plan | Restricted Stock Units (RSUs)
Employee Benefits
Number of units granted				275,000
Units outstanding						288,500
2010 Option Plan | Employee And Directors Stock Options
Employee Benefits
Number of shares or units authorized for grants	2,239,906
Vesting period	4 years
2010 Option Plan | Employee And Directors Time Based Options
Employee Benefits
Options outstanding				370,931
2010 Option Plan | Employee And Directors Performance Options
Employee Benefits
Options outstanding				1,110,116
2006 Option Plan
Employee Benefits
Number of shares or units authorized for grants			450,000
Options outstanding				170,500		127,500
Vesting period			4 years
Term of awards			10 years
SAR Plan
Employee Benefits
Number of shares or units authorized for grants		200,000
Units outstanding				88,000		93,000
Term of awards		10 years
Allocated share based compensation expense reversal | $				$ 188
2014 Option Plan
Employee Benefits
Number of shares or units authorized for grants							1,273,838
Maximum
Employee Benefits
Percentage of participant's salary matched by Company				6.00%