LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES (Loan Portfolio Aging) (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Aging of the recorded investment in past due loans by class of loans
Total Past Due		$ 2,948	$ 4,871
Total Current		2,012,263	1,826,586
Total Loans		2,022,177	1,835,929
30-59 DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		1,623	3,721
60-89 DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		1,325	1,150
90 +DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		0	0
Commercial, Financial and Agricultural [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		385	680
Total Current		420,337	254,239
Total Loans		421,270	255,365
Commercial, Financial and Agricultural [Member] | 30-59 DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		165	489
Commercial, Financial and Agricultural [Member] | 60-89 DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		220	191
Commercial, Financial and Agricultural [Member] | 90 +DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		0	0
Real Estate - Construction [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		130	310
Total Current		117,518	114,708
Total Loans		117,794	115,018
Real Estate - Construction [Member] | 30-59 DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		0	300
Real Estate - Construction [Member] | 60-89 DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		130	10
Real Estate - Construction [Member] | 90 +DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		0	0
Real Estate - Commercial Mortgage [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		83	232
Total Current		659,771	623,890
Total Loans		662,434	625,556
Real Estate - Commercial Mortgage [Member] | 30-59 DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		83	148
Real Estate - Commercial Mortgage [Member] | 60-89 DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		0	84
Real Estate - Commercial Mortgage [Member] | 90 +DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		0	0
Real Estate - Residential [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		726	825
Total Current		355,588	359,233
Total Loans	[1]	358,714	361,450
Real Estate - Residential [Member] | 30-59 DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		143	629
Real Estate - Residential [Member] | 60-89 DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		583	196
Real Estate - Residential [Member] | 90 +DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		0	0
Real Estate - Home Equity [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		148	175
Total Current		193,321	196,388
Total Loans		194,479	197,360
Real Estate - Home Equity [Member] | 30-59 DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		122	155
Real Estate - Home Equity [Member] | 60-89 DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		26	20
Real Estate - Home Equity [Member] | 90 +DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		0	0
Consumer [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		1,476	2,649
Total Current		265,728	278,128
Total Loans		267,486	281,180
Consumer [Member] | 30-59 DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		1,110	2,000
Consumer [Member] | 60-89 DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		366	649
Consumer [Member] | 90 +DPD [Member]
Aging of the recorded investment in past due loans by class of loans
Total Past Due		$ 0	$ 0

[1] Includes loans in process with outstanding balances of $5.7 million and $8.3 million at June 30, 2020 and December 31, 2019, respectively. ⁽²⁾Includes overdraft balances of $1.1 million and $1.6 million at June 30, 2020 and December 31, 2019, respectively.