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Off-Balance-Sheet Arrangements, Commitments and Contingencies Narrative (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Securities:      
Unsettled trades to purchase securities $ 30,270,000 $ 6,378,000 $ 28,662,000
Unsettled trades to sell securities 0 0 14,602,000
Deposits:      
Unsettled Issuances of Brokered CDs $ 0 $ 15,236,000 $ 10,000,000