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Borrowings (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Debt Instrument [Line Items]              
Extinguished and Matured Debt           $ 232,000 $ 268,000
Total Of Debt Matured and ExtinguishedUnder Repurchased Agreement           $ 500,000  
Other borrowings $ 177   $ 177   $ 61    
Subordinated Debt 36,083   36,083   36,083    
Gains Losses On Extinguishment Of Debt (80) $ 0 (80) $ (12,000)      
Due Date 6 2019 Member [Member]              
Debt Instrument [Line Items]              
Extinguished and Matured Debt 25,000   25,000        
Due Date 12 2019 Member [Member]              
Debt Instrument [Line Items]              
Extinguished and Matured Debt 75,000   75,000        
Federal Home Loan Bank Advances [Member]              
Debt Instrument [Line Items]              
Loans pledged as collateral to secure FHLB advances 1,300,000   1,300,000   1,400,000    
Additional Borrowing Capacity 935,500   $ 935,500   $ 1,200,000    
Weighted average period remaining maturity of FHLB advances     5.2 months   10.6 months    
Interest Payable $ 308   $ 308        
Minimum amount of qualifying collateral 110.00%   110.00%        
Repurchase agreement              
Debt Instrument [Line Items]              
Interest Payable $ 642   $ 642   $ 1,500