Earnings per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]
Income available to common shareholders									$ 14,496	$ 16,844	$ 14,868
Weighted average number of common shares, basic, (in shares)									15,495	15,422	15,329
Effect of dilutive stock awards (in shares)									56	33	64
Weighted average number of common shares, diluted (in shares)									15,551	15,455	15,393
Earnings per Common Share [Abstract]
Basic (in dollars per share)	$ 0.16	$ 0.29	$ 0.19	$ 0.30	$ 0.30	$ 0.30	$ 0.18	$ 0.31	$ 0.94	$ 1.09	$ 0.97
Diluted (in dollars per share)	$ 0.16	$ 0.29	$ 0.19	$ 0.30	$ 0.30	$ 0.30	$ 0.18	$ 0.31	$ 0.93	$ 1.09	$ 0.97
Antidilutive stock award excluded from the computation of diluted earnings per common share (in shares)									25	45	53