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Repurchase Agreements - Schedule of Repurchase Agreements (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount $ 11,487 $ 12,483
Overnight And Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount 11,487 12,483
Upto 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
US Federal Agency Obligations [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Carrying Amount 5,391 5,007
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 5,391 5,007
US Federal Agency Obligations [Member] | Upto 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 6,096 7,476
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 6,096 7,476
Agency Mortgage-Backed Securities [Member] | Upto 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