Loans Receivable (Troubled debt restructurings, Rolling Twelve Months) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) number	Dec. 31, 2016 USD ($) number	Dec. 31, 2015 USD ($) number
Mortgage Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | number	34	19	65
Recored Investment | $	$ 3,129	$ 2,241	$ 7,387
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | number	5	2	0
Recored Investment | $	$ 452	$ 157	$ 0
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | number	20	11	8
Recored Investment | $	$ 249	$ 126	$ 177
Auto [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | number	0	0	1
Recored Investment | $	$ 0	$ 0	$ 64