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Derivatives - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative [Line Items]      
Lock in period for interest rates 45 days    
Agreements to sell serviced mortgage loans $ 3,370,396,000    
Gains (losses) on derivative financial instruments 5,763,000 $ (1,527,000) $ (6,494,000)
Interest Rate Contracts with Corporate Customers      
Derivative [Line Items]      
Notional amount 22,243,000 4,409,000  
Offsetting Interest Rate Contracts with Other Financial Institutions      
Derivative [Line Items]      
Notional amount 22,243,000 4,409,000  
Interest Rate Swaps      
Derivative [Line Items]      
Fair value on swap 586,000 (369,000)  
Derivatives Designated As Hedging Instruments | Fair Value Hedge | Included in Loss on Sale of Mortgage Servicing Rights      
Derivative [Line Items]      
Gains (losses) on derivative financial instruments (5,569,000)    
Commitments to Fund Fixed-Rate Mortgage Loans      
Derivative [Line Items]      
Notional amount 532,920,000 263,395,000  
Commitments to Sell Residential Mortgage Loans      
Derivative [Line Items]      
Notional amount $ 829,000,000 $ 445,000,000