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Loans (Details Textuals) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Home equity $ 1,005,802 $ 1,051,927    
Commitments to lend additional funds to borrowers with restructured loans 7,000      
Balance prior to reclassification, consumer, home equity   1,600,000    
Residential mortgage 5,783,267 5,056,891    
Balance prior to reclassification, consumer, mortgage   4,472,800    
Allowance for loan losses 274,264 266,302 $ 268,315 $ 297,409
Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses 128,994 116,025 $ 104,501  
Oil and Gas Industry [Member] | Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for loan losses $ 41,900 $ 17,000    
Percentage of allowance allocated 5.58% 2.26%