Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Distributed earnings allocated to common stock	$ 6,224	$ 5,748
Undistributed earnings allocated to common stock	7,438	2,175
Net Income (Loss) Available to Common Stockholders, Basic	$ 13,662	$ 7,923
Average shares outstanding (in shares)	15,631,000	15,473,000
Effect of dilutive securities:
Warrant outstanding (in shares)	62,000	55,000
Employee stock awards (in shares)	103,000	99,000
Shares for diluted earnings per share (in shares)	15,796,000	15,627,000
Basic earnings per share (in dollars per share)	$ 0.87	$ 0.51
Diluted earnings per share (in dollars per share)	$ 0.86	$ 0.51
Options to purchase shares of common stock, anti-dilutive (in shares)	0	10,000
Common stock exercise price, upper limit (in dollars per share)		$ 40.88