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Fair Values (Summary of Changes in Level 3 Assets) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 25,274 $ 23,896
Purchases 3,375  
Repayments (201) (460)
Unrealized gains (losses) recorded in other comprehensive income (374) 1,175
Ending balance $ 28,074 $ 24,611