Short-Term Borrowings and Long-Term Debt (Borrowings) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Short-term borrowings:
Retail customer repurchase agreements	$ 8,675,000	$ 8,838,000	$ 9,628,000
Total short-term borrowings	8,675,000	8,838,000
Long-term debt:
Federal Home Loan Bank advances	58,328,000	58,370,000
Junior subordinated debt	56,702,000	56,702,000
Total long-term debt	$ 115,030,000	$ 115,072,000
FHLB advance [Member]
Long-term debt:
Long-term debt, weighted average interest rate at December 31	2.62%	2.63%
Junior subordinated debt [Member]
Long-term debt:
Long-term debt, weighted average interest rate at December 31	1.83%	2.09%
Retail customer repurchase agreements [Member]
Short-term borrowings:
Short-term debt, weighted average interest rate at December 31	0.19%	0.42%	0.78%