Consolidated Statements of Changes in Stockholders' Equity Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Dividends on perferred stock (in dollars per share)	$ 424	$ 850	$ 407
Dividends on common stock (in dollars per share)	$ 0.46	$ 0.42	$ 0.40
Issuance of common shares pursuant to the Dividend Reinvestment Plan (in shares)	46,920	53,944	44,521
Issuance of common shares pursuant to the Deferred Compensation Plan (in shares)	12,700	6,048	5,920
Issuance of common shares pursuant to the First Retirement & Savings Plan (in shares)	9,747	19,366	9,693
Issuance of restricted common shares pursuant to the 2007 Stock Incentive Plan (in shares)	6,322	5,320	4,436
Purchase of treasury shares (in shares)	202,170	165,117	128,073
Issuance of common shares pursuant to the exercise of stock options (in shares)	39,373	44,763	11,392
Preferred Stock
Issuance of preferred stock (in shares)	0	1,650	3,850