Interim Condensed Consolidated Statements of Stockholders’ Equity (Unaudited) (USD $) In Thousands, except Share data	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at January 1, 2013 at Dec. 31, 2012	$ 170,514	$ 142	$ 154,691	$ 279,993	$ 50,808	$ 656,148
Balance at January 1, 2013 (in Shares) at Dec. 31, 2012	10,838,412	14,158,127
Net income				13,805		13,805
Other comprehensive income					9,444	9,444
Stock-based compensation			498			498
Repurchase of common stock		(1)	(4,699)			(4,700)
Repurchase of common stock (in Shares)		(100,000)
Shares issued in conversion of preferred stock to common stock	(2)		2
Shares issued in conversion of preferred stock to common stock (in Shares)	(107)	25
Dividends declared to preferred stockholders				(2,168)		(2,168)
Dividends declared to common stockholders				(4,217)		(4,217)
Balance at Mar. 31, 2013	170,512	141	150,492	287,413	60,252	668,810
Balance (in Shares) at Mar. 31, 2013	10,838,305	14,058,152
Balance at January 1, 2013 at Dec. 31, 2013	170,510	141	153,060	318,216	46,185	688,112
Balance at January 1, 2013 (in Shares) at Dec. 31, 2013	10,837,665	14,078,028
Net income				13,229		13,229
Other comprehensive income					5,812	5,812
Stock-based compensation			482			482
Tax expense from exercise of stock options			108			108
Shares sold – options exercised		1	6,475			6,476
Shares sold – options exercised (in Shares)		141,706				(141,706)
Repurchase of common stock (in Shares)						0
Shares issued in conversion of preferred stock to common stock	(3)		3
Shares issued in conversion of preferred stock to common stock (in Shares)	(165)	39
Dividends declared to preferred stockholders				(2,168)		(2,168)
Dividends declared to common stockholders				(4,550)		(4,550)
Balance at Mar. 31, 2014	$ 170,507	$ 142	$ 160,128	$ 324,727	$ 51,997	$ 707,501
Balance (in Shares) at Mar. 31, 2014	10,837,500	14,219,773