Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $) In Thousands, except Share data	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, shares at Dec. 31, 2013							(1,363,342)
Balance at beginning of period, shares at Dec. 31, 2013		28,000	26,461,769
Stock-based compensation				795
Net income	8,350				8,350
Other comprehensive income during the period	2,668					2,668
Repurchase of preferred stock		(28,000)
Purchase of treasury shares							(266)
Dividends on preferred shares					(286)
Issuance of common shares, amount				(68)
Repurchase of preferred stock, shares		(28,000)
Purchase of treasury shares, shares							(13,156)
Issuance of restricted shares			68	(68)
Issuance of restricted shares, shares			68,047
Proceeds from exercise of stock options			6	64
Proceeds from exercise of stock options, shares			5,755
Balance at end of period at Mar. 31, 2014	300,030		26,536	190,513	92,055	2,374	(11,448)
Balance at end of period, shares at Mar. 31, 2014	1,376,498						(1,376,498)
Balance at end of period, shares at Mar. 31, 2014			26,535,571
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, shares at Dec. 31, 2014	1,385,164						(1,385,164)
Balance at beginning of period, shares at Dec. 31, 2014			28,159,027
Stock-based compensation				380
Net income	9,764				9,764
Other comprehensive income during the period	255					255
Purchase of treasury shares							(651)
Issuance of common shares, amount			5,320	109,569
Purchase of treasury shares, shares							(25,278)
Dividends on common shares					(1,610)
Issuance of common shares,shares			5,320,000
Issuance of restricted shares			71	(71)
Issuance of restricted shares, shares			71,000
Proceeds from exercise of stock options			43	685
Proceeds from exercise of stock options, shares			42,558
Balance at end of period at Mar. 31, 2015	$ 489,783		$ 33,593	$ 335,578	$ 126,566	$ 6,353	$ (12,307)
Balance at end of period, shares at Mar. 31, 2015	0						(1,410,442)
Balance at end of period, shares at Mar. 31, 2015			33,592,585