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Loans (Details 3) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Past Due [Line Items]                              
Balance at the beginning of year       $ 6,627       $ 6,263       $ 5,797 $ 6,627 $ 6,263 $ 5,797
Charge-offs                         (110) (145) (164)
Recoveries                         209 370 284
Provisions $ 276 $ 1,062 $ 1,250 1,075 $ 25 $ 9 105 $ 94 $ 20 $ 30 202 3,663 139 346
Balance at end of year 10,389       6,627       6,263       10,389 6,627 6,263
Individually evaluated for impairment 2       6       14       2 6 14
Collectively evaluated for impairment 10,387       6,621       6,249       10,387 6,621 6,249
Total Loans held-for-investment 844,157       737,028       718,462       844,157 737,028 718,462
Individually evaluated for impairment 6,113       3,997       4,381       6,113 3,997 4,381
Collectively evaluated for impairment 838,044       733,031       714,081       838,044 733,031 714,081
Commercial, Financial And Agricultural Loan [Member]                              
Financing Receivable, Past Due [Line Items]                              
Balance at the beginning of year       427       430       221 427 430 221
Charge-offs                         (12)
Recoveries                         130 3 3
Provisions                         221 6 206
Balance at end of year 778       427       430       778 427 430
Individually evaluated for impairment                  
Collectively evaluated for impairment 778       427       430       778 427 430
Total Loans held-for-investment 96,688       51,805       53,933       96,688 51,805 53,933
Individually evaluated for impairment       400             400
Collectively evaluated for impairment 96,688       51,405       53,933       96,688 51,405 53,933
Construction Loans [Member]                              
Financing Receivable, Past Due [Line Items]                              
Balance at the beginning of year       111       89       101 111 89 101
Charge-offs                         (2)
Recoveries                         2
Provisions                         34 22 (12)
Balance at end of year 145       111       89       145 111 89
Individually evaluated for impairment                  
Collectively evaluated for impairment 145       111       89       145 111 89
Total Loans held-for-investment 95,282       73,512       58,440       95,282 73,512 58,440
Individually evaluated for impairment                  
Collectively evaluated for impairment 95,282       73,512       58,440       95,282 73,512 58,440
Residential Mortgage [Member]                              
Financing Receivable, Past Due [Line Items]                              
Balance at the beginning of year       367       431       461 367 431 461
Charge-offs                         (12) (1)
Recoveries                         4
Provisions                         174 (52) (33)
Balance at end of year 541       367       431       541 367 431
Individually evaluated for impairment                  
Collectively evaluated for impairment 541       367       431       541 367 431
Total Loans held-for-investment 43,928       45,357       52,764       43,928 45,357 52,764
Individually evaluated for impairment 440       392       322       440 392 322
Collectively evaluated for impairment 43,488       44,965       52,442       43,488 44,965 52,442
Commercial Real Estate [Member]                              
Financing Receivable, Past Due [Line Items]                              
Balance at the beginning of year       4,602       4,318       3,077 4,602 4,318 3,077
Charge-offs                         (1)
Recoveries                         23 307 210
Provisions                         3,231 (23) 1,031
Balance at end of year 7,855       4,602       4,318       7,855 4,602 4,318
Individually evaluated for impairment 2       6       14       2 6 14
Collectively evaluated for impairment 7,853       4,596       4,304       7,853 4,596 4,304
Total Loans held-for-investment 573,258       527,447       513,833       573,258 527,447 513,833
Individually evaluated for impairment 5,631       3,135       4,030       5,631 3,135 4,030
Collectively evaluated for impairment 567,627       524,312       509,803       567,627 524,312 509,803
Home Equity Line of Credit [Member]                              
Financing Receivable, Past Due [Line Items]                              
Balance at the beginning of year       240       261       308 240 261 308
Charge-offs                         (1) (23)
Recoveries                         2 15 6
Provisions                         82 (35) (30)
Balance at end of year 324       240       261       324 240 261
Individually evaluated for impairment                  
Collectively evaluated for impairment 324       240       261       324 240 261
Total Loans held-for-investment 26,442       28,891       29,583       26,442 28,891 29,583
Individually evaluated for impairment 42       70       29       42 70 29
Collectively evaluated for impairment 26,400       28,821       29,554       26,400 28,821 29,554
Consumer Portfolio Segment [Member]                              
Financing Receivable, Past Due [Line Items]                              
Balance at the beginning of year       97       88       35 97 88 35
Charge-offs                         (107) (120) (140)
Recoveries                         52 45 61
Provisions                         83 84 132
Balance at end of year 125       97       88       125 97 88
Individually evaluated for impairment                  
Collectively evaluated for impairment 125       97       88       125 97 88
Total Loans held-for-investment 8,559       10,016       9,909       8,559 10,016 9,909
Individually evaluated for impairment                  
Collectively evaluated for impairment 8,559       10,016       9,909       8,559 10,016 9,909
Unallocated Financing Receivables [Member]                              
Financing Receivable, Past Due [Line Items]                              
Balance at the beginning of year       $ 783       $ 646       $ 1,594 783 646 1,594
Charge-offs                        
Recoveries                        
Provisions                         (162) 137 (948)
Balance at end of year 621       783       646       621 783 646
Individually evaluated for impairment                  
Collectively evaluated for impairment 621       783       646       621 783 646
Total Loans held-for-investment                  
Individually evaluated for impairment                  
Collectively evaluated for impairment