Interim Condensed Consolidated Statements of Stockholders’ Equity (Unaudited) (USD $) In Thousands, except Share data	Employee Stock Option [Member] Additional Paid-in Capital [Member]	Employee Stock Option [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
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						13,229		13,229
Other comprehensive income							5,812	5,812
Stock-based compensation					482			482
Tax expense (benefit) from exercise of stock options					108			108
Shares sold – options exercised				1	6,475			6,476
Shares sold – options exercised (in Shares)				141,706
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	141	160,129	324,727	51,997	707,501
Balance (in Shares) at Mar. 31, 2014			10,837,500	14,219,773
Balance at Dec. 31, 2014			170,494	140	154,965	343,941	64,608	734,148
Balance (in Shares) at Dec. 31, 2014			10,836,659	14,110,859
Net income						13,242		13,242
Other comprehensive income							2,280	2,280
Stock-based compensation					478			478
Tax expense (benefit) from exercise of stock options	218	218
Shares sold – options exercised				1	5,035			5,036
Shares sold – options exercised (in Shares)				107,901				107,901
Dividends declared to preferred stockholders						(2,168)		(2,168)
Dividends declared to common stockholders						(4,834)		(4,834)
Balance at Mar. 31, 2015			$ 170,494	$ 141	$ 160,696	$ 350,181	$ 66,888	$ 748,400
Balance (in Shares) at Mar. 31, 2015			10,836,659	14,218,760