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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 State and Political Subdivisions - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 792 $ 970 $ 973 $ 967
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 2 4 5
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 (184) 0
Settlements 0 0 0 0
Ending balance 793 972 793 972
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