ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Balance In The Allowance For Loan Losses And The Recorded Investment In Loans By Portfolio Management) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$ 3,216	$ 4,114
Collectively evaluated for impairment	43,905	39,604
Total ending allowance balance	47,121	43,718	$ 43,610	$ 46,262
Loans:
Loans individually evaluated for impairment	13,870	20,692
Loans collectively evaluated for impairment	3,804,589	3,450,235
Total ending loans balance	3,818,459	3,470,927
Commercial and Industrial Loans [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	2,067	3,191
Collectively evaluated for impairment	19,030	17,081
Total ending allowance balance	21,097	20,272	21,564	22,785
Loans:
Loans individually evaluated for impairment	6,979	9,776
Loans collectively evaluated for impairment	1,411,648	1,258,682
Total ending loans balance	1,418,627	1,268,458
Commercial Real Estate and Multi-Family Residential Loans [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	795	576
Collectively evaluated for impairment	13,919	12,876
Total ending allowance balance	14,714	13,452	12,473	14,153
Loans:
Loans individually evaluated for impairment	4,802	9,151
Loans collectively evaluated for impairment	1,438,219	1,290,131
Total ending loans balance	1,443,021	1,299,282
Agri-business and Agricultural Loans [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	4,920	3,532
Total ending allowance balance	4,920	3,532	2,445	1,790
Loans:
Loans individually evaluated for impairment	283	283
Loans collectively evaluated for impairment	382,643	394,621
Total ending loans balance	382,926	394,904
Other Commercial [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	577	461
Total ending allowance balance	577	461	574	276
Loans:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	123,922	98,265
Total ending loans balance	123,922	98,265
Consumer 1-4 Family Mortgage Loans [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	310	296
Collectively evaluated for impairment	2,458	2,531
Total ending allowance balance	2,768	2,827	3,395	3,459
Loans:
Loans individually evaluated for impairment	1,756	1,427
Loans collectively evaluated for impairment	374,013	347,408
Total ending loans balance	375,769	348,835
Other Consumer [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	44	51
Collectively evaluated for impairment	335	336
Total ending allowance balance	379	387	319	483
Loans:
Loans individually evaluated for impairment	50	55
Loans collectively evaluated for impairment	74,144	61,128
Total ending loans balance	74,194	61,183
Unallocated [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	2,666	2,787
Total ending allowance balance	2,666	2,787	$ 2,840	$ 3,316
Loans:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	0	0
Total ending loans balance	$ 0	$ 0