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Basis of Accounting and Consolidation (AOCI) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Total accumulated other comprehensive income, net of tax $ (12,173) $ (2,304)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Net unrealized gains on securities available-for-sale (16,949) (2,619)
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 197 281
Other than Temporary Impairment Loss, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent, Available-for-sale Securities 0 (345)
Unrealized gain (loss) on available-for-sale securities, tax benefit 4,973 841
Total unrealized gain (loss) on available for sale securities, net of tax (12,173) (2,059)
Securities with other-than-temporary impairment losses, tax benefit 0 100
Total securities with other-than-temporary impairment losses, net of tax 0 (245)
Accumulated other comprehensive income, tax 4,973 941
Total accumulated other comprehensive income, net of tax $ (12,173) $ (2,304)