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 Dec. 31, 2012	$ 170,514	$ 141	$ 154,692	$ 279,993	$ 50,808	$ 656,148
Balance (in Shares) at Dec. 31, 2012	10,838,412	14,158,127
Net income				28,147		28,147
Other comprehensive income					878	878
Stock-based compensation			1,359			1,359
Tax expense from exercise of stock options			(225)			(225)
Shares sold – options exercised			270			270
Shares sold – options exercised (in Shares)		7,150
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				(4,336)		(4,336)
Dividends declared to common stockholders				(8,718)		(8,718)
Balance at Jun. 30, 2013	170,512	140	151,399	295,086	51,686	668,823
Balance (in Shares) at Jun. 30, 2013	10,838,305	14,065,302
Balance at Dec. 31, 2013	170,510	140	153,061	318,216	46,185	688,112
Balance (in Shares) at Dec. 31, 2013	10,837,665	14,078,028
Net income				25,740		25,740
Other comprehensive income					9,323	9,323
Stock-based compensation			1,170			1,170
Tax expense from exercise of stock options			201			201
Shares sold – options exercised		1	6,751			6,752
Shares sold – options exercised (in Shares)		148,974				148,974
Repurchase of common stock (in Shares)						0
Shares issued in conversion of preferred stock to common stock	(16)		16
Shares issued in conversion of preferred stock to common stock (in Shares)	(1,006)	241
Acquisition of non-controlling interest			(768)			(768)
Dividends declared to preferred stockholders				(4,335)		(4,335)
Dividends declared to common stockholders				(9,388)		(9,388)
Balance at Jun. 30, 2014	$ 170,494	$ 141	$ 160,431	$ 330,233	$ 55,508	$ 716,807
Balance (in Shares) at Jun. 30, 2014	10,836,659	14,227,243