Fair Value (Reconciliation of all Assets Measured at Fair Value on Recurring Basis, Using Significant Unobservable Inputs (Level 3) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Obligations of State and Political Subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total Gains or Losses (realized/unrealized) Included in Other Comprehensive Income	$ 0	$ 25	$ 38	$ (20)
Fair Value, Measurements, Recurring | Obligations of State and Political Subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance of Recurring Level 3 Assets	8,213	9,521	9,020	10,141
Total Gains or Losses (realized/unrealized) Included in Other Comprehensive Income	0	25	38	(20)
Maturities / Calls	(555)	(540)	(1,400)	(1,115)
Purchases	0	0	0	0
Ending Balance of Recurring Level 3 Assets	7,658	9,006	7,658	9,006
Fair Value, Measurements, Recurring | Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance of Recurring Level 3 Assets	353	353	353	353
Total Gains or Losses (realized/unrealized) Included in Other Comprehensive Income	0	0	0	0
Maturities / Calls	0	0	0	0
Purchases	0	0	0	0
Ending Balance of Recurring Level 3 Assets	$ 353	$ 353	$ 353	$ 353