Consolidated Statements of Changes in Stockholders' Equity (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]	Accumulated Other Comprehensive Income, Net of Tax [Member] Investment Securities Available For Sale [Member]	Accumulated Other Comprehensive Income, Net of Tax [Member] Interest Rate Swap [Member]	Treasury Stock [Member]
Balance at beginning of period at Dec. 31, 2011		$ 50,727	$ 25,087	$ 166,639	$ 54,852		$ 6,440	$ 856	$ (10,831)
Balance at beginning of period, shares at Dec. 31, 2011									1,336,174
Balance at beginning of period, shares at Dec. 31, 2011		52,000	25,087,468
Net income	14,435				14,435
Change during period	(689)						190	(879)
Repurchase of preferred stock		(24,000)
Purchase of treasury shares									(235)
Dividends on preferred shares					(2,642)
Repurchase of warrant				(2,670)
Repurchase of preferred stock, shares		(24,000)
Purchase of treasury shares, shares									18,876
Issuance of restricted shares			67	(67)
Stock-based compensation				1,044
Issuance of restricted shares, shares			67,450
Cancellation of restricted shares				1
Cancellation of restricted shares, shares			(500)
Accretion of fair value of warrant		935			(935)
Proceeds from exercise of stock options			1	2
Proceeds from exercise of stock options, shares			400
Balance at end of period at Dec. 31, 2012	279,017	27,662	25,155	164,949	65,710	6,607	6,630	(23)	(11,066)
Balance at end of period, shares at Dec. 31, 2012									1,355,050
Balance at end of period, shares at Dec. 31, 2012		28,000	25,154,818
Net income	20,018				20,018
Change during period	(6,901)						(8,321)	1,420
Issuance of common stock in acquisition			1,169	23,460
Purchase of treasury shares									(116)
Dividends on preferred shares					(1,399)
Issuance of common stock in acquisition, shares			1,168,918
Purchase of treasury shares, shares									8,292
Issuance of restricted shares			108	(108)
Stock-based compensation				1,041
Issuance of restricted shares, shares			108,400
Cancellation of restricted shares			(4)	4
Cancellation of restricted shares, shares			(4,000)
Accretion of fair value of warrant		338			(338)
Proceeds from exercise of stock options			34	376
Proceeds from exercise of stock options, shares			33,633
Balance at end of period at Dec. 31, 2013	316,699	28,000	26,462	189,722	83,991	(294)	(1,691)	1,397	(11,182)
Balance at end of period, shares at Dec. 31, 2013	1,363,342								1,363,342
Balance at end of period, shares at Dec. 31, 2013		28,000	26,461,769
Net income	38,723				38,723
Change during period	6,392						7,281	(889)
Issuance of common stock in acquisition			1,599	32,875
Repurchase of preferred stock		(28,000)
Purchase of treasury shares									(474)
Dividends on preferred shares					(286)
Issuance of common stock in acquisition, shares			1,598,998
Repurchase of preferred stock, shares		(28,000)
Purchase of treasury shares, shares									21,822
Dividends on common shares					(4,016)
Issuance of restricted shares			77	(77)
Stock-based compensation				2,057
Issuance of restricted shares, shares			77,047
Cancellation of restricted shares			(11)	11
Cancellation of restricted shares, shares			(10,571)
Proceeds from exercise of stock options			32	427
Proceeds from exercise of stock options, shares			31,784
Balance at end of period at Dec. 31, 2014	$ 366,028		$ 28,159	$ 225,015	$ 118,412	$ 6,098	$ 5,590	$ 508	$ (11,656)
Balance at end of period, shares at Dec. 31, 2014	1,385,164								1,385,164
Balance at end of period, shares at Dec. 31, 2014			28,159,027