LOANS AND ALLOWANCE FOR LOAN AND LEASE LOSSES - TDR ACCRUAL STATUS (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) loan	Dec. 31, 2015 USD ($) loan	Dec. 31, 2014 USD ($) loan
Troubled Debt Restructurings disclosures
Number of Loans | loan	308	347	347
Recorded Investment | $	$ 41,586	$ 49,580	$ 49,580
Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan	277	307
Recorded Investment | $	$ 28,753	$ 35,209
Commercial Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan	23	26
Recorded Investment | $	$ 11,265	$ 11,332
Construction & land development
Troubled Debt Restructurings disclosures
Number of Loans | loan	5	8
Recorded Investment | $	$ 881	$ 2,717
Commercial & Industrial
Troubled Debt Restructurings disclosures
Number of Loans | loan	3	6
Recorded Investment | $	$ 687	$ 322
Loans on nonaccrual status
Troubled Debt Restructurings disclosures
Minimum period for which TDRs continue to be reported as non-performing loans	6 months
Number of Loans | loan	87	86
Recorded Investment | $	$ 9,860	$ 12,472
Loans on nonaccrual status | Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan	79	74
Recorded Investment | $	$ 7,199	$ 7,365
Loans on nonaccrual status | Commercial Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan	6	9
Recorded Investment | $	$ 2,430	$ 3,324
Loans on nonaccrual status | Construction & land development
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	2
Recorded Investment | $	$ 77	$ 1,589
Loans on nonaccrual status | Commercial & Industrial
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	1
Recorded Investment | $	$ 154	$ 194
Accrual Loans
Troubled Debt Restructurings disclosures
Number of Loans | loan	221	261
Recorded Investment | $	$ 31,726	$ 37,108
Accrual Loans | Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan	198	233
Recorded Investment | $	$ 21,554	$ 27,844
Accrual Loans | Commercial Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan	17	17
Recorded Investment | $	$ 8,835	$ 8,008
Accrual Loans | Construction & land development
Troubled Debt Restructurings disclosures
Number of Loans | loan	4	6
Recorded Investment | $	$ 804	$ 1,128
Accrual Loans | Commercial & Industrial
Troubled Debt Restructurings disclosures
Number of Loans | loan	2	5
Recorded Investment | $	$ 533	$ 128