Securities, Temporarily Impaired Securities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Temporarily impaired securities with gross unrealized losses and fair value [Abstract]
Less Than 12 Months, Fair Value	$ 53,709	$ 14,673
Less Than 12 Months, Unrealized Loss	838	136
12 Months or More, Fair Value	615	1,123
12 Months or More, Unrealized Loss	176	188
Number of temporarily impaired securities	59	19
Fair Value of temporarily impaired securities	54,324	15,796
Unrealized loss on securities	1,014	324
Carrying value of securities pledged to secure trust deposits	147,114	147,152
Amount of qualifying assets as collateral for borrowing from FHLB	129,330
U.S. Government Agencies and Corporations [Member]
Temporarily impaired securities with gross unrealized losses and fair value [Abstract]
Less Than 12 Months, Fair Value	44,351	6,230
Less Than 12 Months, Unrealized Loss	622	20
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Loss	0	0
State and Political Subdivisions [Member]
Temporarily impaired securities with gross unrealized losses and fair value [Abstract]
Less Than 12 Months, Fair Value	9,358	3,527
Less Than 12 Months, Unrealized Loss	216	19
12 Months or More, Fair Value	482	981
12 Months or More, Unrealized Loss	3	26
Corporate Debt Securities [Member]
Temporarily impaired securities with gross unrealized losses and fair value [Abstract]
Less Than 12 Months, Fair Value		4,916
Less Than 12 Months, Unrealized Loss		97
12 Months or More, Fair Value		0
12 Months or More, Unrealized Loss		0
Other [Member]
Temporarily impaired securities with gross unrealized losses and fair value [Abstract]
Less Than 12 Months, Fair Value	0	0
Less Than 12 Months, Unrealized Loss	0	0
12 Months or More, Fair Value	133	142
12 Months or More, Unrealized Loss	$ 172	$ 162