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Borrowings (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Debt Instrument [Line Items]      
Extinguished Debt $ 232,000 $ 268,000  
Total Of Debt Matured Under Repurchased Agreement 500,000    
Other borrowings 185   $ 61
Subordinated Debt 36,083   36,083
Gains Losses On Extinguishment Of Debt 0 $ (12,000)  
Federal Home Loan Bank Advances [Member]      
Debt Instrument [Line Items]      
Loans pledged as collateral to secure FHLB advances 1,400,000   1,400,000
Additional Borrowing Capacity $ 1,000,000   $ 1,200,000
Weighted average period remaining maturity of FHLB advances 8.6 months   10.6 months
Interest Payable $ 296    
Minimum amount of qualifying collateral 110.00%    
Repurchase agreement      
Debt Instrument [Line Items]      
Interest Payable $ 739   $ 1,500