Short-Term and Long-Term Borrowings (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long-term Debt	$ 0	$ 7,000
Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Long-term Debt	0	7,000
Maturity period		6 months
Long-term debt, weighted average interest rate (in hundredths)		4.13%
Average outstanding balances	3,443	7,975
Weighted average interest rate paid (in hundredths)	4.10%	4.09%
U.S. Treasury [Member] | Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Short-term Debt	0	0
U.S. Treasury [Member] | Secured Borrowings [Member]
Short-term Debt [Line Items]
Short-term Debt	0	0
Federal Home Loan Bank Advances [Member] | Line of Credit [Member]
Short-term Debt [Line Items]
Short-term Debt	146,535
Correspondent Banks [Member] | Line of Credit [Member]
Short-term Debt [Line Items]
Short-term Debt	$ 37,000