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Derivatives (Derivatives Associated With Cash Flow Hedges) (Details) - Cash Flow Hedge - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Hedging Instruments [Member] | Interest Rate Swap [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Notional $ 900,000 $ 250,000  
Assets 1,286    
Liabilities   2,045  
Hedged Items [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Variability in Cash Flows Related to Debt Instruments (Primarily Loans) 650,000   $ 250,000
Hedged Items [Member] | Interest Rate Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Variability in Cash Flows Related to Debt Instruments (Primarily Loans) $ 900,000 $ 250,000