Significant Accounting Policies (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended					12 Months Ended
	Jun. 17, 2011	Dec. 31, 2011 days	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Investment in Federal Home Loan Bank Stock [Member]	Dec. 31, 2010 Investment in Federal Home Loan Bank Stock [Member]	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Number of wholly owned trusts		14
Cash and cash equivalents general maturity		90
Other than temporary impairment losses total		$ 359,000	$ 414,000	$ 10,600,000
Unallocated amount as a percentage of allowance		10.00%
Percentage of loan portfolio is secured by real estate		80.00%
Restricted equity securities		32,581,000	34,475,000		31,300,000	33,200,000
Federal home loan bank stock, minimum investment					10,500,000
Equipment useful life, minimum, years		3
Equipment useful life, maximum, years		10
Premises estimated useful lives, years		39
Impairment charges on servicing assets							0	0	0
Carrying value of Small Business Administration and Department of Agriculture servicing rights		$ 666,000	$ 721,000
Stock options and restricted stock awards generally vested period	four	5