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Comprehensive Income Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Before-Tax Amount        
Other Comprehensive Income $ 896 $ (1,095) $ 6,479 $ (5,063)
Tax (Expense) Benefit        
Other Comprehensive Income (228) 278 (1,648) 1,287
Net of Tax Amount        
Net Unrealized Securities Holding Losses on Securities Available-for-Sale Arising During the Period 499 (897) 4,323 (4,017)
Amortization of Net Retirement Plan 169 80 508 241
Other Comprehensive Loss 668 (817) 4,831 (3,776)
Unrealized Gains and Losses on Available for Sale Securities        
Before-Tax Amount        
Net Unrealized Securities Holding Gains on Securities Available-for-Sale Arising During the Period 668 (1,203) 5,796 (5,388)
Tax (Expense) Benefit        
Net Unrealized Securities Holding Gains on Securities Available-for-Sale Arising During the Period (169) 306 (1,473) 1,371
Net of Tax Amount        
Net Unrealized Securities Holding Losses on Securities Available-for-Sale Arising During the Period 499 (897) 4,323 (4,017)
Amortization of Net Retirement Plan 0 0 0
Amortization of Net Retirement Plan Actuarial Gain (Loss)        
Before-Tax Amount        
Amortization of Net Retirement Plan 172 81 514 244
Tax (Expense) Benefit        
Amortization of Net Retirement Plan (45) (21) (133) (63)
Net of Tax Amount        
Net Unrealized Securities Holding Losses on Securities Available-for-Sale Arising During the Period 0 0 0 0
Amortization of Net Retirement Plan 127 60 381 181
Accumulated Defined Benefit Plans Adjustment, Net Prior Service        
Before-Tax Amount        
Amortization of Net Retirement Plan 56 27 169 81
Tax (Expense) Benefit        
Amortization of Net Retirement Plan (14) (7) (42) (21)
Net of Tax Amount        
Amortization of Net Retirement Plan $ 42 $ 20 $ 127 $ 60