Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Series A 3% Preferred Stock [Member] Retained Earnings [Member]	Series A 3% Preferred Stock [Member]	Series B-1 8.48% Preferred Stock [Member] Retained Earnings [Member]	Series B-1 8.48% Preferred Stock [Member]	Preferred Equity [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2012					$ 17,471	$ 142	$ 67,710	$ 172,244	$ 3,253	$ (6,923)	$ 253,897
Comprehensive income:
Net income								25,530			25,530
Other comprehensive income (loss), net of tax									(13,440)		(13,440)
Purchases of common stock for treasury										(229)	(229)
Repurchase of Series A 3% preferred stock					(1)						(1)
Repurchase of Series B-1 8.48% preferred stock					(128)		(2)				(130)
Share-based compensation plans:
Share-based compensation							407				407
Stock options exercised							16			432	448
Restricted stock awards issued, net							(446)			446
Excess tax benefit							(118)				(118)
Stock awards							7			105	112
Cash dividends declared:
Preferred stock dividends per share	$ (5)	$ (5)	$ (1,461)	$ (1,461)
Common stock dividends per share								(10,171)			(10,171)
Balance at Dec. 31, 2013					17,342	142	67,574	186,137	(10,187)	(6,169)	254,839
Comprehensive income:
Net income								29,355			29,355
Other comprehensive income (loss), net of tax									1,176		1,176
Common stock issued						2	5,398				5,400
Purchases of common stock for treasury										(194)	(194)
Repurchase of Series B-1 8.48% preferred stock					(2)						(2)
Share-based compensation plans:
Share-based compensation							471				471
Stock options exercised							32			635	667
Restricted stock awards issued, net							(520)			520
Cash dividends declared:
Preferred stock dividends per share	(4)	(4)	(1,458)	(1,458)
Common stock dividends per share								(10,718)			(10,718)
Balance at Dec. 31, 2014					17,340	144	72,955	203,312	(9,011)	(5,208)	279,532
Comprehensive income:
Net income								28,337			28,337
Other comprehensive income (loss), net of tax									(2,316)		(2,316)
Purchases of common stock for treasury										(202)	(202)
Share-based compensation plans:
Share-based compensation							674				674
Stock options exercised							6			353	359
Restricted stock awards issued, net							(1,052)			1,052
Excess tax benefit							79				79
Stock awards							28			82	110
Cash dividends declared:
Preferred stock dividends per share	$ (4)	$ (4)	$ (1,458)	$ (1,458)
Common stock dividends per share								(11,267)			(11,267)
Balance at Dec. 31, 2015					$ 17,340	$ 144	$ 72,690	$ 218,920	$ (11,327)	$ (3,923)	$ 293,844