Commitments, Off-Balance Sheet Arrangements and Contingent Liabilities (Details Textuals)	May. 22, 2015 USD ($) loan_production_office branch	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Carrying value of investments		$ 44,000,000	$ 27,000,000
Commitments under unconsolidated projects		26,000,000	28,000,000
Conciliation agreement term	3 years
Mortgage loan commitment under the conciliation agreement	$ 196,000,000
Number of branch openings under the conciliation agreement | branch	1
Number of loan production offices under the conciliation agreement | loan_production_office	4
Cost of conciliation agreement term	4 years
Loans repurchased under make whole requests		1,000,000	5,000,000
Loss reimbursements under make whole requests		10,000	734,000
Loans sold to outside investors original amount		19,300,000,000
Loans sold to outside investors remaining outstanding amount		7,500,000,000
Residential mortgage loans sold with recourse risk		69,000,000	46,000,000
Residential mortgage loans sold with credit recourse risk		154,000,000	178,000,000
Mortgage Repurchase Reserve [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Commitments		2,129,000	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