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Accumulated Other Comprehensive Income (Loss) (Reclassification adjustments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Income before federal income tax expense $ 14,404 $ 15,384 $ 16,253
Compensation and benefits 23,205 22,609 21,525
Federal income tax expense (1,380) (1,363) (3,016)
NET INCOME 13,024 14,021 13,237
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Holding Gains (Losses) on AFS Securities [Member]      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Net gains (losses) on sale of AFS securities 6 0 142
Federal income tax expense [1] (1) 0 (48)
NET INCOME 5 0 94
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Pension Plan [Member]      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Compensation and benefits 268 345 412
Federal income tax expense [1] (56) (72) (140)
NET INCOME $ 212 $ 273 $ 272
[1] Calculations are based on a federal income tax rate of 21% in 2019 and 2018 and 34% in 2017.