Consolidated Statement Of Changes In Shareholders' Equity (USD $) In Thousands	Series A 3% Preferred Stock [Member] Retained Earnings [Member]	Series A 3% Preferred Stock [Member]	Series A Preferred Stock [Member] Retained Earnings [Member]	Series A 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 Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2009							$ 53,418	$ 113	$ 26,940	$ 131,371	$ (3,702)	$ (9,846)	$ 198,294
Comprehensive income:
Net income										16,189			16,189
Other comprehensive income, net of tax											6,504		6,504
Total comprehensive income													22,693
Purchases of treasury stock												(69)	(69)
Share-based compensation plans:
Share-based Compensation									807				807
Stock options exercised									(52)			187	135
Restricted stock awards issued, net									(1,843)			1,843
Directors ' retainer									(15)			112	97
Accretion of discount on Series A preferred stock							274			(274)
Cash dividends declared:
Preferred stock dividends	(3)	(3)	(1,407)	(1,407)	(1,108)	(1,108)							(2,518)
Common- dividend per share										(3,250)			(3,250)
Balance at Sep. 30, 2010							53,692	113	25,837	141,518	2,802	(7,773)	216,189
Balance at Dec. 31, 2010							53,785	113	26,029	144,599	(4,722)	(7,660)	212,144
Comprehensive income:
Net income										17,037			17,037
Other comprehensive income, net of tax											13,129		13,129
Total comprehensive income													30,166
Issuance of common stock								29	43,098				43,127
Purchases of treasury stock												(205)	(205)
Repurchase of warrant issued to U.S. Treasury									(2,080)				(2,080)
Redemption of Series A preferred stock							(37,515)		68				(37,447)
Repurchase of Series B-1 8.48% preferred stock							(96)						(96)
Share-based compensation plans:
Share-based Compensation									863				863
Stock options exercised									(28)			119	91
Restricted stock awards issued, net									(991)			991
Excess tax benefit on share-based compensation									64				64
Directors ' retainer									(12)			110	98
Accretion of discount on Series A preferred stock							1,305			(1,305)
Cash dividends declared:
Preferred stock dividends	(4)	(4)	(399)	(399)	(1,105)	(1,105)							(1,508)
Common- dividend per share										(4,362)			(4,362)
Balance at Sep. 30, 2011							$ 17,479	$ 142	$ 67,011	$ 154,461	$ 8,407	$ (6,645)	$ 240,855