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Borrowings - Securities Sold Under Agreements to Repurchase (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total $ 435,852 $ 597,847
Amounts related to securities sold under agreements to repurchase not included in offsetting disclosure in Note 10 9,000  
Securities sold under agreements to repurchase    
Debt Instrument [Line Items]    
Overnight and continuous 0  
Up to 30 Days 0  
30-90 Days 4,000  
Greater than 90 Days 5,000  
Total $ 9,000