Commitments and Contingencies (Details Textuals) - One-to-four family residences - Purchase commitment $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) loan
Re-performing loans
Mortgage Loans on Real Estate [Line Items]
Number of mortgage loans on real estate | loan	5
Aggregate unpaid principal balance of mortgage loans on real estate | $	$ 1.1
Non-performing loans
Mortgage Loans on Real Estate [Line Items]
Number of mortgage loans on real estate | loan	271
Aggregate unpaid principal balance of mortgage loans on real estate | $	$ 60.1