Allowance for Credit Losses (Recorded Investments in Troubled Debt Restructured Loans) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Pre-modification outstanding recorded investment	$ 942	$ 942
Post-modification outstanding recorded investment	1,073	1,073
Recorded Investment	895	914
Residential Mortgage [Member]
Pre-modification outstanding recorded investment	754	754
Post-modification outstanding recorded investment	883	883
Recorded Investment	709	726
Consumer: Home Equity [Member]
Pre-modification outstanding recorded investment	148	148
Post-modification outstanding recorded investment	148	148
Recorded Investment	147	148
Consumer: Other [Member]
Pre-modification outstanding recorded investment	40	40
Post-modification outstanding recorded investment	42	42
Recorded Investment	$ 39	$ 40