FAIR VALUE (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017		Jun. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]
Impaired financing receivable, recorded investment	$ 5,624	$ 20,697
Allowances for loan losses, impaired
Allowances for loan losses	11,451	9,397	[1]	$ 11,000	$ 9,254	$ 9,197	$ 8,610
Other real estate owned	$ 5,589	$ 7,577	[1]
Impaired Receivable [Member] | Minimum [Member]
Accounts Notes And Loans Receivable [Line Items]
Fair value of estimated costs related to selling the collateral	6.00%	6.00%
Impaired Receivable [Member] | Maximum [Member]
Accounts Notes And Loans Receivable [Line Items]
Fair value of estimated costs related to selling the collateral	10.00%	10.00%
Other Real Estate Owned [Member] | Minimum [Member]
Accounts Notes And Loans Receivable [Line Items]
Fair value of estimated costs related to selling the collateral	5.00%	5.00%
Other Real Estate Owned [Member] | Maximum [Member]
Accounts Notes And Loans Receivable [Line Items]
Fair value of estimated costs related to selling the collateral	7.60%	7.60%
Fair Value, Inputs, Level 3 [Member] | Non-covered loans
Accounts Notes And Loans Receivable [Line Items]
Impaired financing receivable, recorded investment	$ 5,600	$ 20,700
Allowances for loan losses	0	0
Small Business Administration Loan [Member]
Accounts Notes And Loans Receivable [Line Items]
Impaired financing receivable, recorded investment	3,300	5,000
Small Business Administration Loan [Member] | Non-covered loans
Accounts Notes And Loans Receivable [Line Items]
Impaired financing receivable, recorded investment		$ 5,000
Small Business Administration Loan [Member] | Fair Value, Inputs, Level 3 [Member] | Non-covered loans
Accounts Notes And Loans Receivable [Line Items]
Impaired financing receivable, recorded investment	$ 3,300

[1] Derived from audited consolidated financial statements