Earnings Per Share Earnings Per 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]
Net income as reported	$ 5,415	$ 7,930	$ 8,766	$ 6,185	$ 7,206	$ 5,832	$ 8,273	$ 4,112	$ 28,296	$ 25,423	$ 5,573
Preferred stock dividend									(1,488)	(1,750)	(1,750)
Accretion of preferred stock discount									(1,707)	(774)	(717)
Net income available to common shareholders	4,153	7,282	8,122	5,544	6,570	5,200	7,643	3,486	25,101	22,899	3,106
Impact of assumed conversions
Interest on 9% convertible trust preferred securities, net of income tax									1,485	1,485	0
Net income available to common shareholders and assumed conversions									$ 26,586	$ 24,384	$ 3,106
Weighted average common shares outstanding (in shares)									17,859,000	16,683,000	14,747,000
Incremental shares from assumed conversions of convertible trust preferred securities (in shares)									1,439,000	1,439,000	0
Additional dilutive common stock equivalents (in shares)									40,000	23,000	0
Diluted common shares outstanding (in shares)									19,338,000	18,145,000	14,747,000
Basic earnings per common share: (in dollars per share)	$ 0.23	$ 0.41	$ 0.46	$ 0.31	$ 0.37	$ 0.29	$ 0.45	$ 0.23	$ 1.41	$ 1.37	$ 0.21
Diluted earnings per common share: (in dollars per share)	$ 0.23	$ 0.39	$ 0.44	$ 0.31	$ 0.36	$ 0.29	$ 0.43	$ 0.23	$ 1.37	$ 1.34	$ 0.21
Antidilutive Securities Excluded from Computation of Earnings Per Share
Common stock equivalents excluded from earnings per share calculations due to anti-dilutive effect (in shares)									1,027,683	899,493	2,707,424
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share
Common stock equivalents excluded from earnings per share calculations due to anti-dilutive effect (in shares)									324,074	324,074	324,074
Convertible Debt Securities
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Convertible trust preferred securities, interest rate, stated percentage	9.00%				9.00%				9.00%	9.00%