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Derivatives and Hedging Activities (Textual) (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivative [Line Items]        
Derivative, Net Liability Position, Aggregate Fair Value   $ 26,000,000.0 $ 176,000  
Derivative, Collateral, Right to Reclaim Cash   25,493,000 173,000  
Increase (Decrease) in Loans Held-for-sale   822,000 (51,000) $ (113,000)
Net amortization income   0 231,000 244,000
Exposure to Institutional Counterparties   $ 25,400,000 18,400,000  
Maximum length of time Company is currently hedging its exposure   4 years 10 months 24 days    
Customer related positions   $ 51,000,000.0 6,400,000  
Gain (Loss) on Sales of Loans, Net $ 951,000 13,200,000 $ 3,600,000 $ 4,700,000
Fair Value Hedges, Net   0    
Interest Income [Member]        
Derivative [Line Items]        
Interest expense   6,000,000.0    
Interest Expense [Member]        
Derivative [Line Items]        
Interest expense   150,000    
CME [Member]        
Derivative [Line Items]        
Derivative, Collateral, Right to Reclaim Cash   $ 1,300,000