Commitments, Off-Balance Sheet Arrangements and Contingent Liabilities (Details Textuals) (USD $)	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Abstract]
Standby letters of credit Fair value	$ 3,705,000	$ 3,648,000
Carrying value of investments	34,000,000	36,000,000
Commitments under unconsolidated projects	18,000,000	15,000,000
Remaining receivable in the escrow amount	2,000,000	2,000,000
Residential mortgage loans sold with recourse risk	77,000,000	56,000,000
Residential mortgage loans sold with credit recourse risk	349,000,000	475,000,000
Reinsurance treaties minimum limit to assume liability for losses as percentage of aggregate risk exposure	5.00%
Reinsurance treaties maximum limit to assume liability for losses as percentage of aggregate risk exposure	10.00%
Corporations potential risk exposure	19,000,000
Corporations liability for reinsurance losses	9,000,000	8,000,000
Loss Contingency, Settlement Agreement, Consideration	13,000,000
From insurer as a contribution to settlement amount	2,500,000
From insurer as a contribution to defense costs	1,500,000
Reserve for Off-balance Sheet Activities [Member]
Loss Contingencies [Line Items]
Loss contingency reserve	20,000,000	15,000,000
Indemnification Agreement [Member]
Loss Contingencies [Line Items]
Loss contingency reserve	$ 2,000,000	$ 2,000,000