Servicing Assets (Narratives) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Servicing Assets At Fair Value Line Items
Servicing Asset at Fair Value, Amount	$ 9,821,000	$ 9,858,000	$ 7,455,000	$ 13,992,000
Servicing fee	3,900,000	3,700,000	4,800,000
Mortgage Servicing Rights Sale Price			7,000,000
Proceeds from the sale of Mortgage Servicing Rights	$ 0	$ 0	5,927,000
Loss on MSR Held-for-Sale			$ 2,700,000