Mortgage Banking (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Residential Mortgage Loans, Unpaid Principal Balance for Third Parties	$ 1,300,000,000	$ 1,300,000,000
Escrow Deposit	$ 9,736,000	$ 9,057,000
Weighted Average, Prepayment Rate	328 PSA	329 PSA
Weighted Average, Discount Rate	10.04%	9.03%
Adverse Changes in Fair Value, One	10.00%
Adverse Changes in Fair Value, Two	20.00%