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Transfers Accounted for as Secured Borrowings (Details) - U.S. Government-sponsored mortgage-backed securities - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Assets Sold under Agreements to Repurchase [Line Items]    
Collateral pledged for all repurchase agreements accounted for as secured borrowings $ 138,671 $ 155,325
Overnight and Continuous    
Assets Sold under Agreements to Repurchase [Line Items]    
Collateral pledged for all repurchase agreements accounted for as secured borrowings 119,326 131,537
Up to 30 Days    
Assets Sold under Agreements to Repurchase [Line Items]    
Collateral pledged for all repurchase agreements accounted for as secured borrowings 1,336 5,680
30-90 Days    
Assets Sold under Agreements to Repurchase [Line Items]    
Collateral pledged for all repurchase agreements accounted for as secured borrowings 10,432 8,892
Greater Than 90 Days    
Assets Sold under Agreements to Repurchase [Line Items]    
Collateral pledged for all repurchase agreements accounted for as secured borrowings $ 7,577 $ 9,216