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SEGMENT INFORMATION (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
item
Mar. 31, 2012
Dec. 31, 2012
SEGMENT INFORMATION      
Number of reportable segments 3    
SEGMENT INFORMATION      
Net interest income $ 30,669,000 $ 30,502,000  
Credit for loan and lease losses 6,561,000 4,990,000  
Other operating income 12,472,000 13,232,000  
Other operating expense (32,195,000) (35,246,000)  
Income taxes 119,802,000    
Net income 137,309,000 13,478,000  
Investment securities 1,696,428,000   1,698,593,000
Loans and leases (including loans held for sale) 2,291,891,000   2,242,227,000
Other 592,758,000   429,548,000
Total assets 4,581,077,000   4,370,368,000
Banking Operations
      
SEGMENT INFORMATION      
Net interest income 24,046,000 23,237,000  
Intersegment net interest income (expense) 3,541,000 12,416,000  
Credit for loan and lease losses 6,561,000 4,990,000  
Other operating income 11,537,000 12,336,000  
Other operating expense (18,445,000) (21,844,000)  
Administrative and overhead expense allocation (13,174,000) (12,754,000)  
Income taxes 120,712,000    
Net income 134,778,000 18,381,000  
Loans and leases (including loans held for sale) 2,291,891,000   2,242,227,000
Other 111,977,000   (7,267,000)
Total assets 2,403,868,000   2,234,960,000
Treasury
      
SEGMENT INFORMATION      
Net interest income 6,623,000 7,265,000  
Intersegment net interest income (expense) (6,311,000) (5,857,000)  
Other operating income 872,000 1,086,000  
Other operating expense (489,000) (398,000)  
Administrative and overhead expense allocation (214,000) (196,000)  
Income taxes 127,000    
Net income 608,000 1,900,000  
Investment securities 1,696,428,000   1,698,593,000
Other 408,918,000   363,815,000
Total assets 2,105,346,000   2,062,408,000
All Others
      
SEGMENT INFORMATION      
Intersegment net interest income (expense) 2,770,000 (6,559,000)  
Other operating income 63,000 (190,000)  
Other operating expense (13,261,000) (13,004,000)  
Administrative and overhead expense allocation 13,388,000 12,950,000  
Income taxes (1,037,000)    
Net income 1,923,000 (6,803,000)  
Other 71,863,000   73,000,000
Total assets $ 71,863,000   $ 73,000,000