ALLOWANCE FOR CREDIT LOSSES (Allowance For Credit Losses By Segment, Class And Impairment Status) (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	$ 40,736,000	$ 28,101,000
Allowance for impaired loans and leases	5,353,000	1,519,000
Allowance for all other loans and leases	127,656,000	140,924,000
Total allowance	133,009,000	142,443,000	$ 143,950,000	$ 153,236,000
Evaluated for impairment threshold	500,000
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	9,245,000	10,518,000
Allowance for impaired loans and leases	189,000	1,022,000
Allowance for all other loans and leases	24,916,000	22,540,000
Total allowance	25,105,000	23,562,000	23,201,000	43,853,000
All Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	103,000	170,000
Allowance for all other loans and leases	9,306,000	11,761,000
Total allowance	9,306,000	11,761,000	11,369,000	10,350,000
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	14,008,000	2,154,000
Allowance for impaired loans and leases	4,454,000	215,000
Allowance for all other loans and leases	19,376,000	21,204,000
Total allowance	23,830,000	21,419,000	21,328,000	18,376,000
Consumer Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	4,112,000	4,786,000
Allowance for impaired loans and leases		123,000
Allowance for all other loans and leases	33,644,000	39,892,000
Total allowance	33,644,000	40,015,000	41,428,000	39,525,000
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	1,802,000	619,000
Allowance for impaired loans and leases	401,000	70,000
Allowance for all other loans and leases	7,561,000	9,472,000
Total allowance	7,962,000	9,542,000	9,640,000	5,663,000
Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	332,000
Allowance for all other loans and leases	2,515,000	3,420,000
Total allowance	2,515,000	3,420,000	3,698,000	2,800,000
Commercial And Industrial - Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	8,527,000	7,467,000
Allowance for impaired loans and leases	306,000	89,000
Allowance for all other loans and leases	14,651,000	16,236,000
Total allowance	14,957,000	16,325,000	17,257,000	17,059,000
Construction, Acquisition And Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded balance of impaired loans	2,607,000	2,387,000
Allowance for impaired loans and leases	3,000
Allowance for all other loans and leases	10,797,000	9,885,000
Total allowance	10,800,000	9,885,000	10,174,000	11,828,000
Credit Cards [Member]
Financing Receivable, Impaired [Line Items]
Allowance for all other loans and leases	4,890,000	6,514,000
Total allowance	$ 4,890,000	$ 6,514,000	$ 5,855,000	$ 3,782,000