Fair Value (Reconciliation of all Assets Measured at Fair Value on Recurring Basis, Using Significant Unobservable Inputs (Level 3) (Details) - Fair Value, Measurements, Recurring - Obligations of State and Political Subdivisions - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 3,482	$ 4,512	$ 4,021	$ 4,991
Total Gains or Losses Included in Other Comprehensive Income	(7)	(6)	(23)	(15)
Maturities / Calls	(980)	0	(1,503)	(470)
Purchases	0	0	0	0
Balance of Recurring Level 3 Assets at June 30	$ 2,495	$ 4,506	$ 2,495	$ 4,506