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LOANS AND LEASES (Loans And Leases, Net Of Unearned Income By Segment, Class And Geographical Location) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total $ 10,658,761 $ 10,372,778 $ 10,219,576
Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,254,026    
Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,339,262    
Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,018,267    
Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 3,565,117    
Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 469,282    
Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,099,064    
Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,715,164    
Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 198,579    
Commercial And Industrial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,616,152 1,747,774  
Commercial And Industrial [Member] | Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 135,467    
Commercial And Industrial [Member] | Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 205,833    
Commercial And Industrial [Member] | Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 184,819    
Commercial And Industrial [Member] | Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 639,204    
Commercial And Industrial [Member] | Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 78,950    
Commercial And Industrial [Member] | Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 116,203    
Commercial And Industrial [Member] | Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 214,287    
Commercial And Industrial [Member] | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 41,389    
Credit Cards [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 107,447 112,165  
Credit Cards [Member] | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 107,447    
All Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 428,458 441,003  
All Other [Member] | Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 70,487    
All Other [Member] | Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 45,925    
All Other [Member] | Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 28,675    
All Other [Member] | Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 174,356    
All Other [Member] | Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 3,562    
All Other [Member] | Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 30,749    
All Other [Member] | Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 55,727    
All Other [Member] | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 18,977    
Consumer Mortgages [Member] | Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 2,611,387 2,472,202  
Consumer Mortgages [Member] | Real Estate [Member] | Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 335,856    
Consumer Mortgages [Member] | Real Estate [Member] | Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 325,793    
Consumer Mortgages [Member] | Real Estate [Member] | Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 226,092    
Consumer Mortgages [Member] | Real Estate [Member] | Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 831,986    
Consumer Mortgages [Member] | Real Estate [Member] | Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 84,046    
Consumer Mortgages [Member] | Real Estate [Member] | Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 294,218    
Consumer Mortgages [Member] | Real Estate [Member] | Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 484,806    
Consumer Mortgages [Member] | Real Estate [Member] | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 28,590    
Home Equity [Member] | Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 622,566 589,752  
Home Equity [Member] | Real Estate [Member] | Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 96,539    
Home Equity [Member] | Real Estate [Member] | Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 43,963    
Home Equity [Member] | Real Estate [Member] | Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 69,255    
Home Equity [Member] | Real Estate [Member] | Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 227,952    
Home Equity [Member] | Real Estate [Member] | Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 23,328    
Home Equity [Member] | Real Estate [Member] | Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 144,835    
Home Equity [Member] | Real Estate [Member] | Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 14,836    
Home Equity [Member] | Real Estate [Member] | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,858    
Agricultural [Member] | Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 242,171 259,360  
Agricultural [Member] | Real Estate [Member] | Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 7,734    
Agricultural [Member] | Real Estate [Member] | Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 81,798    
Agricultural [Member] | Real Estate [Member] | Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 27,160    
Agricultural [Member] | Real Estate [Member] | Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 67,213    
Agricultural [Member] | Real Estate [Member] | Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 5,032    
Agricultural [Member] | Real Estate [Member] | Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 12,864    
Agricultural [Member] | Real Estate [Member] | Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 40,052    
Agricultural [Member] | Real Estate [Member] | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 318    
Commercial And Industrial - Owner Occupied [Member] | Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,668,477 1,617,429  
Commercial And Industrial - Owner Occupied [Member] | Real Estate [Member] | Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 195,572    
Commercial And Industrial - Owner Occupied [Member] | Real Estate [Member] | Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 178,681    
Commercial And Industrial - Owner Occupied [Member] | Real Estate [Member] | Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 200,406    
Commercial And Industrial - Owner Occupied [Member] | Real Estate [Member] | Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 662,735    
Commercial And Industrial - Owner Occupied [Member] | Real Estate [Member] | Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 49,901    
Commercial And Industrial - Owner Occupied [Member] | Real Estate [Member] | Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 140,843    
Commercial And Industrial - Owner Occupied [Member] | Real Estate [Member] | Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 240,339    
Construction, Acquisition And Development [Member] | Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,121,386 945,045  
Construction, Acquisition And Development [Member] | Real Estate [Member] | Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 127,828    
Construction, Acquisition And Development [Member] | Real Estate [Member] | Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 101,148    
Construction, Acquisition And Development [Member] | Real Estate [Member] | Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 58,844    
Construction, Acquisition And Development [Member] | Real Estate [Member] | Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 353,188    
Construction, Acquisition And Development [Member] | Real Estate [Member] | Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 24,535    
Construction, Acquisition And Development [Member] | Real Estate [Member] | Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 163,247    
Construction, Acquisition And Development [Member] | Real Estate [Member] | Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 292,596    
Commercial Real Estate [Member] | Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 2,240,717 $ 2,188,048  
Commercial Real Estate [Member] | Real Estate [Member] | Alabama and Florida Panhandle [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 284,543    
Commercial Real Estate [Member] | Real Estate [Member] | Arkansas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 356,121    
Commercial Real Estate [Member] | Real Estate [Member] | Louisiana [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 223,016    
Commercial Real Estate [Member] | Real Estate [Member] | Mississippi [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 608,483    
Commercial Real Estate [Member] | Real Estate [Member] | Missouri [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 199,928    
Commercial Real Estate [Member] | Real Estate [Member] | Tennessee [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 196,105    
Commercial Real Estate [Member] | Real Estate [Member] | Texas [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total $ 372,521