Condensed Consolidated Statement of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Preferred Shares [Member]	Common Shares [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Shares [Member]
Stockholders' Equity, Beginning Balance at Dec. 31, 2012	$ 335,428	$ 96,325	$ 246	$ 180,289	$ 117,048	$ (58,480)
Shares Outstanding, Beginning Balance at Dec. 31, 2012		4,000	21,687,253
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,851				11,851
Fair value over carrying value of preferred shares redeemed	0	2,190			(2,190)
Dividends, Preferred Stock	(1,219)	0			(1,219)
Common share issuance	2,461,000		2,461,000
Net proceeds from issuance of common shares	54,617		25	54,592
Preferred shares redeemed during period	2,000	(2,000)
Reclassification of preferred shares redeemed	(50,352)	(50,352)
Stock options exercised, shares			184,832
Stock options exercised	2,640			(1,031)		3,671
Stock-based compensation expense	1,316			1,316
Deferral of executive and director compensation	253			253
Executive and director deferred compensation distributions shares			24,858
Executive and director deferred compensation distributions	0			(493)		493
Stockholders' Equity, Ending Balance at Jun. 30, 2013	$ 354,534	$ 48,163	$ 271	$ 234,926	$ 125,490	$ (54,316)
Shares Outstanding, Ending Balance at Jun. 30, 2013		2,000	24,357,943