CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010
Common stock, par value (in dollars per share)	$ 1	$ 1		$ 1
Cash dividends per share (in dollars per share)	$ 0.64	$ 0.58	[1]	$ 0.58	[1]
Common stock issued in acquisition (in shares)		179,036
Treasury shares purchased, at cost (in shares)	2,895	0	[2]	0	[2]
Series A - Preferred Stock $1,000 par value [Member]
Preferred stock, par value (in dollars per share)	$ 1,000	$ 1,000		$ 1,000
Series B - Preferred Stock $1,000 par value [Member]
Preferred stock, par value (in dollars per share)	$ 1,000	$ 1,000		$ 1,000
Series C - Preferred Stock $1,000 par value [Member]
Preferred stock, par value (in dollars per share)	$ 1,000	$ 1,000		$ 1,000

[1] 2011 and 2010 share amounts reflect the ten percent stock dividend paid February 24, 2012 to stockholders of record as of February 17, 2012.

[2] The shares issued as a stock dividend were estimated for the years 2010 and 2009. The estimate was based on ten percent of the aggregate shares outstanding at the respective balance sheet dates.