Commitments, Off-Balance Sheet Arrangements and Contingent Liabilities (Details Textuals) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Carrying value of investments	$ 41,000,000	$ 27,000,000
Commitments under unconsolidated projects	28,000,000	28,000,000
Loans repurchased under make whole requests	800,000	5,000,000
Loss reimbursements under make whole requests	6,000	734,000
Loans sold to outside investors original amount	18,900,000,000
Loans sold to outside investors remaining outstanding amount	7,500,000,000
Residential mortgage loans sold with recourse risk	52,000,000	46,000,000
Residential mortgage loans sold with credit recourse risk	167,000,000	178,000,000
Mortgage Repurchase Reserve [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Commitments	2,481,000	3,258,000	5,737,000
Reserve for Off-balance Sheet Activities [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Commitments	$ 24,900,000	$ 24,900,000	$ 21,900,000