Share-Based Compensation Plan - Restricted stock service awards and performance awarded under the 2006 Equity Compensation Plan (Details) - 2006 Equity Compensation Plan [Member] - Restricted Stock [Member] $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested at beginning of year (in shares) | shares	134,108
Granted (in shares) | shares	36,150
Vested (in shares) | shares	(15,692)
Forfeited (in shares) | shares	(500)
Non-vested at end of period (in shares) | shares	154,066
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Non-vested at beginning of year (in dollars per share)	$ 16.66
Granted (in dollars per share)	18.50
Vested (in dollars per share)	15.82
Forfeited (in dollars per share)	18.07
Non-vested at end of period (in dollars per share)	$ 17.17
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]
Non-vested at end of period | $	$ 2,713