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Fair Value (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Derivatives, Fair Value [Line Items]      
Other noninterest-bearing investments valued under the cost method $ 23,200   $ 25,300
Federal Home Loan Bank Stock and Federal Reserve Bank Stock 196,600   191,500
Net gains on sale of OREO properties 1,329 $ (374)  
Principal amount of other real estate owned property sold 2,100 4,100  
OREO Properties [Member]      
Derivatives, Fair Value [Line Items]      
Net gains on sale of OREO properties 1,800 $ 700  
Level 2 [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of AFS securities 8,641,960   7,581,309
Level 3 [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of AFS securities 0   $ 0
Third Party Pricing Service [Member] | Level 2 [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of AFS securities $ 0