Interim Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2013	10,837,665	14,078,028
Balance at Dec. 31, 2013	$ 170,510	$ 140	$ 153,061	$ 318,216	$ 46,185	$ 688,112
Net income				$ 38,569		38,569
Other comprehensive income					$ 3,377	3,377
Stock–based compensation			1,547			1,547
Tax benefit from exercise of stock options			201			201
Shares sold – options exercised (in shares)		145,074
Shares sold – options exercised		$ 1	6,756			6,756
Repurchase of common stock (in shares)		(125,000)
Repurchase of common stock		$ (1)	(6,994)			(6,995)
Shares issued in conversion of preferred stock to common stock (in shares)	(1,006)	241
Shares issued in conversion of preferred stock to common stock	$ (16)		16
Acquisition of non-controlling interest			(768)			(768)
Dividends to Preferred Stockholders				$ (6,502)		(6,502)
Dividends declared to common stockholders ($1.00 per share)				(14,181)		(14,181)
Balance (in shares) at Sep. 30, 2014	10,836,659	14,098,343
Balance at Sep. 30, 2014	$ 170,494	$ 140	153,819	336,102	$ 49,562	710,117
Balance (in shares) at Dec. 31, 2013	10,837,665	14,078,028
Balance at Dec. 31, 2013	$ 170,510	$ 140	153,061	318,216	46,185	$ 688,112
Shares sold – options exercised (in shares)						157,590
Balance (in shares) at Dec. 31, 2014	10,836,659	14,110,859
Balance at Dec. 31, 2014	$ 170,494	$ 140	154,965	343,941	64,608	$ 734,148
Net income				38,167		38,167
Other comprehensive income					(13,588)	(13,588)
Stock–based compensation			1,557			1,557
Tax benefit from exercise of stock options			585			$ 585
Shares sold – options exercised (in shares)		176,184				176,184
Shares sold – options exercised		$ 3	8,228			$ 8,231
Shares issued in conversion of preferred stock to common stock (in shares)	(74,967)	18,142
Shares issued in conversion of preferred stock to common stock	$ (1,189)		1,189
Dividends to Preferred Stockholders				(6,487)		(6,487)
Dividends declared to common stockholders ($1.00 per share)				(16,256)		(16,256)
Balance (in shares) at Sep. 30, 2015	10,761,692	14,305,185
Balance at Sep. 30, 2015	$ 169,305	$ 143	$ 166,524	$ 359,365	$ 51,020	$ 746,357