Long-Term Borrowings (Details) (USD $)			3 Months Ended	9 Months Ended						9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Mar. 31, 2012 Callable national market repurchase agreements	Sep. 30, 2012 Minimum	Sep. 30, 2012 Maximum	Sep. 30, 2012 FHLB putable non-amortizing, fixed rate advances	Dec. 31, 2011 FHLB putable non-amortizing, fixed rate advances	Sep. 30, 2012 FHLB amortizing, fixed rate advances	Dec. 31, 2011 FHLB amortizing, fixed rate advances	Sep. 30, 2012 FHLB convertible rate advances Minimum	Sep. 30, 2012 FHLB convertible rate advances Maximum	Sep. 30, 2012 FHLB putable advances
Long-term borrowings:
Callable national market repurchase agreements, Balance	$ 40,000,000	$ 65,000,000
FHLB fixed rate advances, Balance						50,000,000	60,000,000	16,270,000	17,312,000
Total long-term borrowings, Balance	106,270,000	142,312,000
Callable national market repurchase agreements, Weighted-Average Rate	3.63%	3.43%	3.09%
FHLB fixed rate advances, Weighted-Average Rate						3.32%	3.28%	3.61%	3.59%
Total long-term borrowings, Weighted-Average Rate	3.48%	3.38%
Repurchase agreements, maturities period				5 years	10 years
Repurchase agreements, call option features at buyer discretion, initial call period				3 months	5 years
Prepayment of wholesale borrowings			35,000,000
Early termination fees			$ 3,100,000
FHLB advances, maturities period				5 years	20 years
FHLB advances,fixed rate intial period										1 year	4 years
FHLB advances, termination option at FHLB discretion, initial period												3 months