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Borrowings (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Other borrowings $ 1,734 $ 4,004
Subordinated Debt 102,371 101,584
Federal Home Loan Bank Advances [Member]    
Debt Instrument [Line Items]    
Loans Receivable, Gross, Commercial, Mortgage 1,100,000 1,200
Additional Borrowing Capacity $ 600,400 $ 606,600
Weighted average period remaining maturity of FHLB advances 6.9 months 8.8 months
Interest Payable $ 343  
Repurchase agreement    
Debt Instrument [Line Items]    
Interest Payable $ 2,100 $ 2,300