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Repurchase Agreements - Schedule of Repurchase Agreements (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount $ 13,793 $ 13,509
Overnight and Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount 13,793 13,509
Up to 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount
30 - 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount
Greater Than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount
U.S. Federal Treasury Obligations [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount 388  
U.S. Federal Treasury Obligations [Member] | Overnight and Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount 388  
U.S. Federal Treasury Obligations [Member] | Up to 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount  
U.S. Federal Treasury Obligations [Member] | 30 - 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount  
U.S. Federal Treasury Obligations [Member] | Greater Than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount  
US Federal Agency Obligations [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount 4,958 5,147
US Federal Agency Obligations [Member] | Overnight and Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount 4,958 5,147
US Federal Agency Obligations [Member] | Up to 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount
US Federal Agency Obligations [Member] | 30 - 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount
US Federal Agency Obligations [Member] | Greater Than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount
Agency Mortgage-backed Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount 8,447 8,362
Agency Mortgage-backed Securities [Member] | Overnight and Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount 8,447 8,362
Agency Mortgage-backed Securities [Member] | Up to 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount
Agency Mortgage-backed Securities [Member] | 30 - 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount
Agency Mortgage-backed Securities [Member] | Greater Than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount