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Loans and Allowance - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance, beginning of year       $ 2,541         $ 2,541 $ 2,589
Charged off                 (616) (1,151)
Recoveries                 256 247
Provision for loan losses $ (179) $ (139) $ 30 173 $ 255 $ 246 $ (5) $ 360 (115) 856
Balance, end of year 2,066       2,589       2,066 2,541
Individually evaluated for impairment:                    
Individually evaluated for impairment, Balance in allowance 15               15 226
Individually evaluated for impairment, Related loan balance 4,397               4,397 2,250
Collectively evaluated for impairment:                    
Collectively evaluated for impairment, Balance in allowance 2,051               2,051 2,315
Collectively evaluated for impairment, Related loan balance 280,341               280,341 296,870
Consumer                    
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance, beginning of year       161         161 214
Charged off                 (69) (208)
Recoveries                 16 48
Provision for loan losses                 14 107
Balance, end of year 122       214       122 161
Individually evaluated for impairment:                    
Individually evaluated for impairment, Balance in allowance 15               15 22
Individually evaluated for impairment, Related loan balance 86               86 138
Collectively evaluated for impairment:                    
Collectively evaluated for impairment, Balance in allowance 107               107 139
Collectively evaluated for impairment, Related loan balance 11,990               11,990 12,933
Residential Real estate                    
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance, beginning of year       864         864 1,061
Charged off                 (16) (589)
Recoveries                 5 2
Provision for loan losses                 (264) 390
Balance, end of year 589       1,061       589 864
Individually evaluated for impairment:                    
Individually evaluated for impairment, Related loan balance 631               631 854
Collectively evaluated for impairment:                    
Collectively evaluated for impairment, Balance in allowance 589               589 864
Collectively evaluated for impairment, Related loan balance 80,402               80,402 81,783
Indirect                    
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance, beginning of year       988         988 774
Charged off                 (504) (341)
Recoveries                 225 183
Provision for loan losses                 208 372
Balance, end of year 917       774       917 988
Collectively evaluated for impairment:                    
Collectively evaluated for impairment, Balance in allowance 917               917 988
Collectively evaluated for impairment, Related loan balance 102,384               102,384 116,698
Commercial                    
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance, beginning of year       241         241 237
Charged off                 (27)  
Recoveries                 10 14
Provision for loan losses                 (186) (10)
Balance, end of year 38       237       38 241
Individually evaluated for impairment:                    
Individually evaluated for impairment, Balance in allowance                   204
Individually evaluated for impairment, Related loan balance                   204
Collectively evaluated for impairment:                    
Collectively evaluated for impairment, Balance in allowance 38               38 37
Collectively evaluated for impairment, Related loan balance 11,907               11,907 14,080
Construction                    
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance, beginning of year       4         4 12
Provision for loan losses                 7 (8)
Balance, end of year 11       12       11 4
Collectively evaluated for impairment:                    
Collectively evaluated for impairment, Balance in allowance 11               11 4
Collectively evaluated for impairment, Related loan balance 3,317               3,317 2,317
Commercial Real Estate                    
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance, beginning of year       $ 283         283 291
Charged off                   (13)
Provision for loan losses                 106 5
Balance, end of year 389       $ 291       389 283
Individually evaluated for impairment:                    
Individually evaluated for impairment, Related loan balance 3,680               3,680 1,054
Collectively evaluated for impairment:                    
Collectively evaluated for impairment, Balance in allowance 389               389 283
Collectively evaluated for impairment, Related loan balance $ 70,341               $ 70,341 69,059
Commercial Mortgage Portfolio Segment                    
Individually evaluated for impairment:                    
Individually evaluated for impairment, Balance in allowance                   $ 204