Fair Value (Reconciliation of all Assets Measured at Fair Value on a Recurring Basis, Using Significant Unobservable Inputs (Level 3)) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Obligations of State and Political Subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance of Recurring Level 3 Assets at January 1	$ 9,020	$ 10,141
Total Gains or Losses (realized/unrealized) Included in Other Comprehensive Income	(75)	(6)
Maturities / Calls	(1,650)	(1,115)
Purchases	0	0
Balance of Recurring Level 3 Assets at December 31	7,295	9,020
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance of Recurring Level 3 Assets at January 1	353	353
Total Gains or Losses (realized/unrealized) Included in Other Comprehensive Income	0	0
Maturities / Calls	0	0
Purchases	0	0
Balance of Recurring Level 3 Assets at December 31	$ 353	$ 353