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Derivatives (Derivatives Associated With Cash Flow Hedges) (Details) - Cash Flow Hedge - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Hedging Instruments | Interest Rate Swap        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional $ 900,000   $ 250,000  
Liabilities 1,058   2,045  
Hedged Items        
Derivative Instruments, Gain (Loss) [Line Items]        
Variability in Cash Flows Related to Debt Instruments (Primarily Loans)   $ 650,000   $ 250,000
Hedged Items | Interest Rate Contract        
Derivative Instruments, Gain (Loss) [Line Items]        
Variability in Cash Flows Related to Debt Instruments (Primarily Loans) $ 900,000   $ 250,000