LOANS AND ALLOWANCE FOR LOAN LOSSES (Schedule of carrying amount of covered purchased impaired and non-impaired loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 2,185,635	$ 2,178,961
Other Consumer Loans
Accounts Notes And Loans Receivable [Line Items]
Total loans	26,304	32,347
GAB acquisition [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	620,368	807,208
GAB acquisition [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	9,199	11,449	$ 13,614
GAB acquisition [Member] | Receivables Acquired Without Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	611,169	795,759	$ 1,011,801
GAB acquisition [Member] | Commercial Real Estate [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	311,267	384,276
GAB acquisition [Member] | Commercial Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,978	4,387
GAB acquisition [Member] | Commercial Real Estate [Member] | Receivables Acquired Without Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	307,289	379,889
GAB acquisition [Member] | Other Consumer Loans
Accounts Notes And Loans Receivable [Line Items]
Total loans	15,153	21,731
GAB acquisition [Member] | Other Consumer Loans | Receivables Acquired Without Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	15,153	21,731
Construction Loans [Member] | GAB acquisition [Member] | Construction and Land Development
Accounts Notes And Loans Receivable [Line Items]
Total loans	21,137	47,824
Construction Loans [Member] | GAB acquisition [Member] | Construction and Land Development | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	26	358
Construction Loans [Member] | GAB acquisition [Member] | Construction and Land Development | Receivables Acquired Without Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	21,111	47,466
1-4 Family Residential | GAB acquisition [Member] | 1-4 Family Residential
Accounts Notes And Loans Receivable [Line Items]
Total loans	235,728	279,181
1-4 Family Residential | GAB acquisition [Member] | 1-4 Family Residential | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	2,841	3,654
1-4 Family Residential | GAB acquisition [Member] | 1-4 Family Residential | Receivables Acquired Without Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	232,887	275,527
Commercial Mortgage Loan | GAB acquisition [Member] | Commercial Mortgage Loan
Accounts Notes And Loans Receivable [Line Items]
Total loans	37,083	74,196
Commercial Mortgage Loan | GAB acquisition [Member] | Commercial Mortgage Loan | Receivables Acquired with Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	2,354	3,050
Commercial Mortgage Loan | GAB acquisition [Member] | Commercial Mortgage Loan | Receivables Acquired Without Deteriorated Credit Quality [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 34,729	$ 71,146