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Other Intangible Assets (Carrying and Fair Value of MSRs) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net carrying value, fair value of MSRs and loans Corporation servicing for others        
Total other intangible assets $ 38,104 $ 33,080    
Loans serviced for others that have servicing rights capitalized 2,082,899 2,093,140    
Mortgage servicing rights [Member]        
Net carrying value, fair value of MSRs and loans Corporation servicing for others        
Total other intangible assets 11,122 12,217 $ 3,423 $ 3,478
Fair value of MSRs 15,542 14,979    
Originated Portfolio [Member]        
Net carrying value, fair value of MSRs and loans Corporation servicing for others        
Loans serviced for others that have servicing rights capitalized $ 888,000 $ 881,000