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Accumulated Other Comprehensive Income (Loss) (Reclassification adjustments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reclassification out of Accumulated Other Comprehensive Income [Line Items]      
Other than Temporary Impairment Losses, Investments $ 0 $ 0 $ 770
Net AFS Impairment Loss 0 0 (770)
Income before federal income tax expense 15,384 16,253 16,147
Compensation and benefits 22,609 21,525 19,170
Federal income tax expense (1,363) (3,016) (2,348)
NET INCOME 14,021 13,237 13,799
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 0 142 245
Other than Temporary Impairment Losses, Investments 0 0 (770)
Marketable Securities, Realized Gain (Loss) 0 142 (525)
Federal income tax expense [1] 0 (48) 179
NET INCOME 0 94 (346)
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 345 412 238
Federal income tax expense [1] (72) (140) (81)
NET INCOME $ 273 $ 272 $ 157
[1] Calculations are based on a federal income tax rate of 21% in 2018 and 34% in 2017 and 2016.