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Commitments and Contingencies (Narrative) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
properties
$ / shares
shares
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
properties
$ / shares
shares
Sep. 30, 2014
USD ($)
Dec. 31, 2014
Loss Contingencies [Line Items]          
Litigation settlement other company owned stock $ 4,400,000   $ 4,400,000    
Number of non-cancelable operating leases | properties 277   277    
Rent expense $ 9,500 $ 9,800 $ 28,200 $ 23,600  
Rent income 298 $ 170 527 $ 441  
Standby letters of credit that expire within one year 44,400   44,400    
Standby letters of credit that expire thereafter 18,000   18,000    
Fair value of guarantee with standby letters of credit 1,200   1,200    
Residential mortgage loan repurchase reserve liability $ 2,700   $ 2,700    
Concentration risk, percentage     79.00%   80.00%
Visa Inc [Member]          
Loss Contingencies [Line Items]          
Other company stock owned shares | shares 483,806   483,806    
Conversion ratio from Class B shares into Class A shares     164.83%    
Value of the Class A shares | $ / shares $ 69.40   $ 69.40    
Unredeemed Class A equivalent shares owned     $ 55,300