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LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES (Activity in the allowance for credit losses) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance $ 22,175,000 $ 22,457,000 $ 23,816,000 $ 13,905,000
Provision for credit losses (546,000) 1,265,000 (3,042,000) 7,870,000
Charge-Offs (1,788,000) (1,282,000) (3,765,000) (4,776,000)
Recoveries 1,659,000 697,000 4,491,000 2,869,000
Net Charge-Offs (129,000) (585,000) 726,000 (1,907,000)
Ending Balance 21,500,000 23,137,000 21,500,000 23,137,000
Impact of Adoption of ASC 326 [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance       3,269,000
Commercial, Financial and Agricultural [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 1,972,000 2,468,000 2,204,000 1,675,000
Provision for credit losses 178,000 (195,000) (192,000) 544,000
Charge-Offs (37,000) (137,000) (138,000) (685,000)
Recoveries 66,000 74,000 305,000 188,000
Net Charge-Offs 29,000 (63,000) 167,000 (497,000)
Ending Balance 2,179,000 2,210,000 2,179,000 2,210,000
Commercial, Financial and Agricultural [Member] | Impact of Adoption of ASC 326 [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance       488,000
Real Estate - Construction [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 2,759,000 1,955,000 2,479,000 370,000
Provision for credit losses 517,000 161,000 797,000 1,444,000
Charge-Offs 0 0 0 0
Recoveries 10,000 0 10,000 0
Net Charge-Offs 10,000 0 10,000 0
Ending Balance 3,286,000 2,116,000 3,286,000 2,116,000
Real Estate - Construction [Member] | Impact of Adoption of ASC 326 [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance       302,000
Real Estate - Commercial Mortgage [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 7,569,000 6,640,000 7,029,000 3,416,000
Provision for credit losses (1,588,000) 616,000 (1,719,000) 2,132,000
Charge-Offs (405,000) (17,000) (405,000) (28,000)
Recoveries 169,000 30,000 840,000 291,000
Net Charge-Offs (236,000) 13,000 435,000 263,000
Ending Balance 5,745,000 7,269,000 5,745,000 7,269,000
Real Estate - Commercial Mortgage [Member] | Impact of Adoption of ASC 326 [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance       1,458,000
Real Estate - Residential [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 4,353,000 5,440,000 5,440,000 3,128,000
Provision for credit losses (433,000) (344,000) (1,768,000) 745,000
Charge-Offs (17,000) (1,000) (88,000) (112,000)
Recoveries 401,000 35,000 720,000 126,000
Net Charge-Offs 384,000 34,000 632,000 14,000
Ending Balance 4,304,000 5,130,000 4,304,000 5,130,000
Real Estate - Residential [Member] | Impact of Adoption of ASC 326 [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance       1,243,000
Real Estate - Home Equity [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 2,457,000 2,753,000 3,111,000 2,224,000
Provision for credit losses (131,000) 196,000 (900,000) 337,000
Charge-Offs (15,000) (58,000) (94,000) (141,000)
Recoveries 46,000 41,000 240,000 138,000
Net Charge-Offs 31,000 (17,000) 146,000 (3,000)
Ending Balance 2,357,000 2,932,000 2,357,000 2,932,000
Real Estate - Home Equity [Member] | Impact of Adoption of ASC 326 [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance       374,000
Consumer [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance 3,065,000 3,201,000 3,553,000 3,092,000
Provision for credit losses 911,000 831,000 740,000 2,668,000
Charge-Offs (1,314,000) (1,069,000) (3,040,000) (3,810,000)
Recoveries 967,000 517,000 2,376,000 2,126,000
Net Charge-Offs (347,000) (552,000) (664,000) (1,684,000)
Ending Balance $ 3,629,000 $ 3,480,000 $ 3,629,000 3,480,000
Consumer [Member] | Impact of Adoption of ASC 326 [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning Balance       $ (596,000)