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Fair Value of Assets and Liabilities - Fair Value of Assets Measured on a Recurring Basis Using Significant Unobservable Inputs (Details) - Obligations of States and Political Subdivisions - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 614 $ 790 $ 794 $ 973
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Total gains or losses:        
Included in net income 1 1 2 2
Included in other comprehensive income (loss) 0 0 0 0
Purchases, issuances, sales and settlements:        
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 (181) (184)
Ending balance 615 791 615 791
Total gains or losses for the period included in net income attributable to the change in unrealized gains or losses related to assets and liabilities still held at the reporting date $ 0 $ 0 $ 0 $ 0