Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income, Net of Tax [Member]	Treasury Stock [Member]
Balance at beginning of period at Dec. 31, 2013		$ 28,000	$ 26,462	$ 189,722	$ 83,991	$ (294)	$ (11,182)
Balance at beginning of period at Dec. 31, 2013		28,000	26,461,769
Balance at beginning of period at Dec. 31, 2013							(1,363,342)
Net income	$ 16,480				16,480
Other comprehensive income (loss) during the period	4,417					4,417
Repurchase of preferred stock		$ (28,000)
Purchase of treasury shares							$ (432)
Stock-based compensation				1,012
Dividends on preferred shares					(286)
Issuance of common shares, amount			$ 1,599	32,875
Repurchase of preferred stock, shares		(28,000)
Purchase of treasury shares, shares							(20,154)
Dividends on common shares					(1,338)
Issuance of common shares, shares			1,598,987
Proceeds from exercise of stock options			$ 26	347
Proceeds from exercise of stock options, shares			26,514
Issuance of restricted shares			$ 68	(68)
Issuance of restricted shares, shares			68,047
Balance at end of period at Jun. 30, 2014	$ 343,399		$ 28,155	223,888	98,847	4,123	$ (11,614)
Balance at end of period at Jun. 30, 2014			28,155,317
Balance at end of period at Jun. 30, 2014	1,383,496						(1,383,496)
Balance at beginning of period at Dec. 31, 2014	$ 366,028		$ 28,159	225,015	118,412	6,098	$ (11,656)
Balance at beginning of period at Dec. 31, 2014			28,159,027
Balance at beginning of period at Dec. 31, 2014	1,385,164						(1,385,164)
Net income	$ 11,072				11,072
Other comprehensive income (loss) during the period	(3,026)					(3,026)
Purchase of treasury shares							$ (732)
Stock-based compensation				760
Issuance of common shares, amount			$ 5,320	109,569
Purchase of treasury shares, shares							(28,613)
Dividends on common shares					(3,219)
Issuance of common shares, shares			5,320,000
Proceeds from exercise of stock options			$ 59	939
Proceeds from exercise of stock options, shares			58,839
Issuance of restricted shares			$ 71	(71)
Issuance of restricted shares, shares			71,000
Balance at end of period at Jun. 30, 2015	$ 486,770		$ 33,609	$ 336,212	$ 126,265	$ 3,072	$ (12,388)
Balance at end of period at Jun. 30, 2015			33,608,866
Balance at end of period at Jun. 30, 2015	1,413,777						(1,413,777)