Fair Value (Reconciliation of all Assets Measured at Fair Value on Recurring Basis, Using Significant Unobservable Inputs (Level 3) (Details) - Fair Value, Measurements, Recurring - Significant Unobservable  Inputs (Level 3) - Obligations of State and Political Subdivisions - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance of Recurring Level 3 Assets	$ 0	$ 2,495	$ 497	$ 4,021
Total Losses Included in Other Comprehensive Income	0	(3)	(2)	(26)
Maturities / Calls	0	(1,995)	(495)	(3,498)
Purchases	0	0	0	0
Balance of Recurring Level 3 Assets at September 30	$ 0	$ 497	$ 0	$ 497