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Borrowings (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Debt Instrument [Line Items]      
Other borrowings $ 1,756   $ 1,734
Subordinated Debt 102,808   102,633
Gains Losses On Extinguishment Of Debt (12,000) $ 0  
Federal Home Loan Bank Advances [Member]      
Debt Instrument [Line Items]      
Loans Receivable, Gross, Commercial, Mortgage 1,500,000   1,300,000
Additional Borrowing Capacity $ 875,300   $ 770,600
Weighted average period remaining maturity of FHLB advances 5.6 months   6.3 months
Interest Payable $ 348    
Repurchase agreement      
Debt Instrument [Line Items]      
Interest Payable 1,700   $ 2,200
Repurchase agreement modified balance 232,000    
Repurchase agreement terminated before maturity 268,000    
Repurchase agreement modified during the period $ 500,000