Quarterly report pursuant to Section 13 or 15(d)

LOANS (Analysis of Allowance For Loan Losses By Portfolio Segment) (Details)

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LOANS (Analysis of Allowance For Loan Losses By Portfolio Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Allowance for loan losses:      
Balance, beginning of year $ 43,419 [1] $ 35,629  
Charge-offs (449) (897)  
Recoveries 116 219  
Provision 2,059 2,405  
Balance, end of year 45,145 37,356  
Individually Evaluated for Impairment 6,201   $ 5,683
Collectively Evaluated for Impairment 38,944   37,736
Ending Balance 4,340,900   4,216,375 [1]
Individually Evaluated for Impairment 50,643   33,491
Collectively Evaluated for Impairment 4,290,257   4,182,884
Commercial Financial and Agricultural Financing Receivable [Member]      
Allowance for loan losses:      
Balance, beginning of year 21,495 16,079  
Charge-offs (50) (77)  
Recoveries 3 19  
Provision 1,391 836  
Balance, end of year 22,839 16,857  
Individually Evaluated for Impairment 3,645   2,698
Collectively Evaluated for Impairment 19,194   18,797
Ending Balance 1,799,133   1,760,479
Individually Evaluated for Impairment 20,075   11,513
Collectively Evaluated for Impairment 1,779,058   1,748,966
Residential Real Estate Mortgage Loans [Member]      
Allowance for loan losses:      
Balance, beginning of year 16,061 12,112  
Charge-offs 0 (433)  
Recoveries 97 101  
Provision 743 1,766  
Balance, end of year 16,901 13,546  
Individually Evaluated for Impairment 1,733   1,730
Collectively Evaluated for Impairment 15,168   14,331
Ending Balance 2,237,425   2,157,582
Individually Evaluated for Impairment 25,762   17,880
Collectively Evaluated for Impairment 2,211,663   2,139,702
Consumer Portfolio Segment [Member]      
Allowance for loan losses:      
Balance, beginning of year 431 1,043  
Charge-offs (18) (5)  
Recoveries 0 0  
Provision (13) 26  
Balance, end of year 400 1,064  
Individually Evaluated for Impairment 30   32
Collectively Evaluated for Impairment 370   399
Ending Balance 50,088   55,047
Individually Evaluated for Impairment 39   46
Collectively Evaluated for Impairment 50,049   55,001
Construction Loans [Member] | Commercial Real Estate Portfolio Segment [Member]      
Allowance for loan losses:      
Balance, beginning of year 5,432 6,395  
Charge-offs (381) (382)  
Recoveries 16 99  
Provision (62) (223)  
Balance, end of year 5,005 $ 5,889  
Individually Evaluated for Impairment 793   1,223
Collectively Evaluated for Impairment 4,212   4,209
Ending Balance 254,254   243,267
Individually Evaluated for Impairment 4,767   4,052
Collectively Evaluated for Impairment $ 249,487   $ 239,215
[1] derived from audited financial statements