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Borrowings (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2003
Debt Instrument [Line Items]        
New Repurchase Agreement Debt Amount du to Unwind $ 232,000      
Extinguished Debt 268,000      
Total Of Debt Matured Under Repurchased Agreement 500,000      
Other borrowings 61 $ 1,734    
Subordinated Debt $ 36,083 $ 102,633    
Trust redeemable preferred securities issued       $ 35,000
Debt Instrument Interest Rate Terms 3-month LIBOR plus 295 basis points      
Debt Instrument Basis Spread On Variable Rate 3.94% 3.48%    
Gains Losses On Extinguishment Of Debt $ (12,000) $ 0 $ 0  
Repayments Of Subordinated Debt 67,000      
Oher borrowings repaid 1,700      
Federal Home Loan Bank Advances [Member]        
Debt Instrument [Line Items]        
Loans pledged as collateral to secure FHLB advances 1,400,000 1,300,000    
Additional Borrowing Capacity $ 1,200,000 $ 770,600    
Weighted average period remaining maturity of FHLB advances 10.6 months 6.3 months    
Interest Payable $ 300      
Minimum amount of qualifying collateral 110.00%      
Repurchase agreement        
Debt Instrument [Line Items]        
Interest Payable $ 1,500 $ 2,200