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LOANS AND LEASES (Loans And Leases, Net Of Unearned Income By Segment, Class And Geographical Location) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total $ 11,018,540 $ 10,811,991 $ 10,575,978
Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,308,173    
Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,313,526    
Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,052,592    
Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 3,608,857    
Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 485,625    
Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,134,133    
Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,913,514    
Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 202,120    
Commercial And Industrial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,566,459 1,612,295  
Commercial And Industrial [Member] | Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 141,372    
Commercial And Industrial [Member] | Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 193,526    
Commercial And Industrial [Member] | Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 194,235    
Commercial And Industrial [Member] | Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 572,109    
Commercial And Industrial [Member] | Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 91,371    
Commercial And Industrial [Member] | Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 110,161    
Commercial And Industrial [Member] | Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 207,777    
Commercial And Industrial [Member] | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 55,908    
Credit Cards [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 104,169 109,656  
Credit Cards [Member] | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 104,169    
All Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 407,330 412,619  
All Other [Member] | Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 51,849    
All Other [Member] | Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 40,196    
All Other [Member] | Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 24,271    
All Other [Member] | Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 215,870    
All Other [Member] | Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 3,411    
All Other [Member] | Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 21,951    
All Other [Member] | Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 43,433    
All Other [Member] | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 6,349    
Consumer Mortgages [Member] | Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 2,776,213 2,643,966  
Consumer Mortgages [Member] | Real Estate [Member] | Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 374,392    
Consumer Mortgages [Member] | Real Estate [Member] | Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 322,148    
Consumer Mortgages [Member] | Real Estate [Member] | Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 239,660    
Consumer Mortgages [Member] | Real Estate [Member] | Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 867,821    
Consumer Mortgages [Member] | Real Estate [Member] | Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 93,572    
Consumer Mortgages [Member] | Real Estate [Member] | Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 305,685    
Consumer Mortgages [Member] | Real Estate [Member] | Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 539,131    
Consumer Mortgages [Member] | Real Estate [Member] | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 33,804    
Home Equity [Member] | Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 624,868 628,846  
Home Equity [Member] | Real Estate [Member] | Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 96,296    
Home Equity [Member] | Real Estate [Member] | Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 45,630    
Home Equity [Member] | Real Estate [Member] | Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 69,035    
Home Equity [Member] | Real Estate [Member] | Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 232,247    
Home Equity [Member] | Real Estate [Member] | Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 21,535    
Home Equity [Member] | Real Estate [Member] | Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 141,970    
Home Equity [Member] | Real Estate [Member] | Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 16,271    
Home Equity [Member] | Real Estate [Member] | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,884    
Agricultural [Member] | Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 245,646 245,377  
Agricultural [Member] | Real Estate [Member] | Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 8,244    
Agricultural [Member] | Real Estate [Member] | Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 83,788    
Agricultural [Member] | Real Estate [Member] | Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 25,615    
Agricultural [Member] | Real Estate [Member] | Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 67,496    
Agricultural [Member] | Real Estate [Member] | Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 8,163    
Agricultural [Member] | Real Estate [Member] | Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 13,577    
Agricultural [Member] | Real Estate [Member] | Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 38,757    
Agricultural [Member] | Real Estate [Member] | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 6    
Commercial And Industrial - Owner Occupied [Member] | Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,795,321 1,764,265  
Commercial And Industrial - Owner Occupied [Member] | Real Estate [Member] | Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 210,072    
Commercial And Industrial - Owner Occupied [Member] | Real Estate [Member] | Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 195,859    
Commercial And Industrial - Owner Occupied [Member] | Real Estate [Member] | Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 212,839    
Commercial And Industrial - Owner Occupied [Member] | Real Estate [Member] | Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 718,767    
Commercial And Industrial - Owner Occupied [Member] | Real Estate [Member] | Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 46,545    
Commercial And Industrial - Owner Occupied [Member] | Real Estate [Member] | Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 157,145    
Commercial And Industrial - Owner Occupied [Member] | Real Estate [Member] | Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 254,094    
Construction, Acquisition And Development [Member] | Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,156,901 1,157,248  
Construction, Acquisition And Development [Member] | Real Estate [Member] | Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 120,174    
Construction, Acquisition And Development [Member] | Real Estate [Member] | Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 70,919    
Construction, Acquisition And Development [Member] | Real Estate [Member] | Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 52,951    
Construction, Acquisition And Development [Member] | Real Estate [Member] | Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 352,608    
Construction, Acquisition And Development [Member] | Real Estate [Member] | Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 18,399    
Construction, Acquisition And Development [Member] | Real Estate [Member] | Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 166,344    
Construction, Acquisition And Development [Member] | Real Estate [Member] | Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 375,506    
Commercial Real Estate [Member] | Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 2,341,633 $ 2,237,719  
Commercial Real Estate [Member] | Real Estate [Member] | Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 305,774    
Commercial Real Estate [Member] | Real Estate [Member] | Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 361,460    
Commercial Real Estate [Member] | Real Estate [Member] | Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 233,986    
Commercial Real Estate [Member] | Real Estate [Member] | Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 581,939    
Commercial Real Estate [Member] | Real Estate [Member] | Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 202,629    
Commercial Real Estate [Member] | Real Estate [Member] | Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 217,300    
Commercial Real Estate [Member] | Real Estate [Member] | Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total $ 438,545