Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Distributed earnings allocated to common stock	$ 6,365	$ 6,315
Undistributed earnings allocated to common stock	5,206	11,468
Net earnings allocated to common shareholders	$ 11,571	$ 17,783
Average shares outstanding (in shares)	14,916,000	15,067,000
Effect of dilutive securities:
Warrant outstanding	0	62,000
Employee stock awards	11,000	20,000
Shares for diluted earnings per share (in shares)	14,927,000	15,149,000
Basic earnings per common share (in dollars per share)	$ 0.78	$ 1.18
Diluted earnings per share (in dollars per share)	$ 0.78	$ 1.17
Options to purchase shares of common stock, anti-dilutive (in shares)	0	6,400