Commitments, Off-Balance Sheet Arrangements and Contingent Liabilities (Details Textuals) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Standby letters of credit Fair value	$ 3,526,000	$ 3,754,000
Carrying value of investments	28,000,000	33,000,000
Commitments under unconsolidated projects	15,000,000	16,000,000
Residential mortgage loans sold with recourse risk	44,000,000	56,000,000
Residential mortgage loans sold with credit recourse risk	190,000,000	233,000,000
Loans sold to outside investors original amount	18,400,000,000
Loans sold to outside investors remaining outstanding amount	7,600,000,000
Loans repurchased under make whole requests	4,000,000	3,000,000
Loss reimbursements under make whole requests	500,000	3,000,000
Mortgage Repurchase Reserve [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Balance at end of period	3,400,000	5,700,000	3,300,000
Reserve for Off-balance Sheet Activities [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Balance at end of period	$ 24,400,000	$ 21,900,000	$ 21,800,000