Securities Sold under Agreement to Repurchase and Other Borrowings (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012 Tranches	Dec. 31, 2011
Securities Sold under Agreement to Repurchase and Other Borrowings (Additional Textual) [Abstract]
Fair value of mortgage-backed securities	$ 125,500,000	$ 115,400,000
Match-funding advance related to a commercial participation loan	598,000	618,000
Debt outstanding	0
Number of repurchase agreement tranches	3
Tranches One [Member]
Securities Sold under Agreement to Repurchase and Other Borrowings (Textual) [Abstract]
Repurchase agreements tranches amount	30,000,000
Maturity date of tranches	Jan. 26, 2016
Prepayment penalties on repurchase agreements	3,100,000
Tranches Two [Member]
Securities Sold under Agreement to Repurchase and Other Borrowings (Textual) [Abstract]
Repurchase agreements tranches amount	30,000,000
Maturity date of tranches	Sep. 26, 2016
Prepayment penalties on repurchase agreements	4,100,000
Tranches Three [Member]
Securities Sold under Agreement to Repurchase and Other Borrowings (Textual) [Abstract]
Repurchase agreements tranches amount	30,000,000
Maturity date of tranches	Feb. 20, 2017
Prepayment penalties on repurchase agreements	$ 4,200,000