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	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$ 4,625		$ 4,114
Collectively evaluated for impairment	39,938		39,604
Total ending allowance balance	44,563	$ 43,774	43,718	$ 43,247	$ 43,284	$ 43,610
Loans:
Loans individually evaluated for impairment	19,580		20,692
Loans collectively evaluated for impairment	3,557,424		3,450,235
Total ending loans balance	3,577,004		3,470,927
Commercial and Industrial Loans [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	3,734		3,191
Collectively evaluated for impairment	16,485		17,081
Total ending allowance balance	20,219	19,781	20,272	20,935	20,465	21,564
Loans:
Loans individually evaluated for impairment	11,192		9,776
Loans collectively evaluated for impairment	1,353,075		1,258,682
Total ending loans balance	1,364,267		1,268,458
Commercial Real Estate and Multi-Family Residential Loans [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	561		576
Collectively evaluated for impairment	13,214		12,876
Total ending allowance balance	13,775	13,718	13,452	12,637	12,752	12,473
Loans:
Loans individually evaluated for impairment	6,661		9,151
Loans collectively evaluated for impairment	1,334,473		1,290,131
Total ending loans balance	1,341,134		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	3,870		3,532
Total ending allowance balance	3,870	3,459	3,532	3,047	2,454	2,445
Loans:
Loans individually evaluated for impairment	283		283
Loans collectively evaluated for impairment	331,173		394,621
Total ending loans balance	331,456		394,904
Other Commercial [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	568		461
Total ending allowance balance	568	545	461	365	559	574
Loans:
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	116,493		98,265
Total ending loans balance	116,493		98,265
Consumer 1-4 Family Mortgage Loans [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	286		296
Collectively evaluated for impairment	2,403		2,531
Total ending allowance balance	2,689	2,790	2,827	2,934	3,586	3,395
Loans:
Loans individually evaluated for impairment	1,391		1,427
Loans collectively evaluated for impairment	353,809		347,408
Total ending loans balance	355,200		348,835
Other Consumer [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	44		51
Collectively evaluated for impairment	345		336
Total ending allowance balance	389	379	387	333	344	319
Loans:
Loans individually evaluated for impairment	53		55
Loans collectively evaluated for impairment	68,401		61,128
Total ending loans balance	68,454		61,183
Unallocated [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	3,053		2,787
Total ending allowance balance	3,053	$ 3,102	2,787	$ 2,996	$ 3,124	$ 2,840
Loans:
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	0		0
Total ending loans balance	$ 0		$ 0