Consolidated Statement of Shareholders' Equity (USD $)	Total	Preferred Stock	Common Stock	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock
Balance at beginning of period at Dec. 31, 2010	$ 230,681,000	$ 38,645,000	$ 166,298,000	$ 45,547,000	$ (4,453,000)	$ (15,356,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12,555,000			12,555,000
Other comprehensive loss, net of tax	5,865,000				5,865,000
Accrued dividends on preferred shares	(988,000)			(988,000)
Amortization of discount on preferred shares	0	355,000		(355,000)
Repurchase of common stock warrant	39,000,000
Cash dividends declared on common shares	(3,179,000)			(3,179,000)
Tax benefit from exercise of stock options	1,000		1,000
Reissuance of treasury stock for deferred compensation plan	(176,000)					(176,000)
Purchase of treasury stock	187,000					187,000
Common shares issued under dividend reinvestment plan	318,000		318,000
Common shares issued under Board of Directors' compensation plan	(105,000)		(42,000)			(63,000)
Stock-based compensation expense	310,000		310,000
Repurchase of preferred shares	(39,000,000)
Balance at end of period at Dec. 31, 2011	206,657,000	0	166,969,000	53,580,000	1,412,000	(15,304,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	20,385,000			20,385,000
Other comprehensive loss, net of tax	(758,000)				(758,000)
Repurchase of common stock warrant	1,201,000
Cash dividends declared on common shares	(4,807,000)			(4,807,000)
Tax benefit from exercise of stock options	16,000		16,000
Reissuance of treasury stock for deferred compensation plan	(163,000)					(163,000)
Purchase of treasury stock	156,000					156,000
Common shares issued under dividend reinvestment plan	357,000		357,000
Common shares issued under Board of Directors' compensation plan	130,000		(44,000)			174,000
Stock-based compensation expense	942,000		942,000
Balance at end of period at Dec. 31, 2012	221,728,000	0	167,039,000	69,158,000	654,000	(15,123,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	17,574,000			17,574,000
Other comprehensive loss, net of tax	(13,898,000)				(13,898,000)
Repurchase of common stock warrant	0
Cash dividends declared on common shares	(5,834,000)			(5,834,000)
Tax benefit from exercise of stock options	79,000		79,000
Reissuance of treasury stock for deferred compensation plan	(168,000)					(168,000)
Purchase of treasury stock	228,000					228,000
Common shares issued under dividend reinvestment plan	423,000		423,000
Common shares issued under Board of Directors' compensation plan	179,000		(34,000)			213,000
Stock-based compensation expense	1,362,000		1,362,000
Balance at end of period at Dec. 31, 2013	$ 221,553,000	$ 0	$ 168,869,000	$ 80,898,000	$ (13,244,000)	$ (14,970,000)