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Goodwill and Other Intangible Assets (Narrative) (Details)
$ in Thousands
12 Months Ended
Mar. 27, 2015
USD ($)
item
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]          
Goodwill   $ 621,193 $ 621,193    
Weighted approach percentage of fair market value of goodwill higher than book value         23.00%
Goodwill impairment charges   $ 0 $ 0 $ 0  
Core Deposit Intangibles [Member]          
Finite-Lived Intangible Assets [Line Items]          
Weighted-average remaining life   9 years      
Other Identifiable Intangibles [Member]          
Finite-Lived Intangible Assets [Line Items]          
Weighted-average remaining life   6 years      
Texas [Member] | Core Deposit Intangibles [Member]          
Finite-Lived Intangible Assets [Line Items]          
Intangibles eliminated in conjunction with sale of branches $ 1,100        
Number of branches sold | item 4