Earnings Per Common Share (Calculations of Basic and Diluted Earnings per Common Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share [Abstract]
Distributed earnings allocated to common stock									$ 4,770	$ 3,167	$ 4,209
Undistributed earnings allocated to common stock									15,494	8,019	(683)
Net earnings allocated to common shareholders									$ 20,264	$ 11,186	$ 3,526
Weighted-average number of common shares outstanding - basic	10,542,810	10,530,800	10,524,429	10,513,388	10,494,210	10,484,609	10,478,362	10,471,819	10,527,885	10,482,318	10,424,474
Effect of postentially dilutive common shares									401	0	7,516
Weighted-average number of common shares outstanding - diluted	10,542,810	10,530,876	10,524,429	10,513,388	10,514,960	10,519,673	10,507,895	10,477,360	10,528,286	10,482,318	10,431,990
Earnings per common share - basic	$ 0.36	$ 0.45	$ 0.47	$ 0.63	$ 0.33	$ 0.35	$ 0.26	$ 0.13	$ 1.92	$ 1.07	$ 0.34
Earnings per common share - diluted	$ 0.36	$ 0.45	$ 0.47	$ 0.63	$ 0.33	$ 0.35	$ 0.26	$ 0.13	$ 1.92	$ 1.07	$ 0.34
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock Warrant					313,505					313,505
Restricted Shares, Stock Options and SARs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from computation of EPS									144,535	210,370	243,560