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Loans and Allowance for Loan Losses - Total Allowance by Loan Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance, beginning of year       $ 2,589         $ 2,589 $ 2,484
Charged off                 (1,151) (566)
Recoveries                 247 335
Provision for loan losses $ 255 $ 246 $ (5) 360 $ 93 $ 78 $ (30) $ 195 856 336
Balance, end of year 2,541       2,484       2,541 2,589
Individually evaluated for impairment:                    
Individually evaluated for impairment, Balance in allowance 226               226 782
Individually evaluated for impairment, Related loan balance 2,250               2,250 3,898
Collectively evaluated for impairment:                    
Collectively evaluated for impairment, Balance in allowance 2,315               2,315 1,807
Collectively evaluated for impairment, Related loan balance 296,870               296,870 267,714
Consumer                    
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance, beginning of year       214         214 182
Charged off                 (208) (96)
Recoveries                 48 8
Provision for loan losses                 107 120
Balance, end of year 161       182       161 214
Individually evaluated for impairment:                    
Individually evaluated for impairment, Balance in allowance 22               22 52
Individually evaluated for impairment, Related loan balance 138               138 160
Collectively evaluated for impairment:                    
Collectively evaluated for impairment, Balance in allowance 139               139 162
Collectively evaluated for impairment, Related loan balance 12,933               12,933 15,952
Residential Real estate                    
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance, beginning of year       1,061         1,061 1,042
Charged off                 (589) (3)
Recoveries                 2 27
Provision for loan losses                 390 (5)
Balance, end of year 864       1,042       864 1,061
Individually evaluated for impairment:                    
Individually evaluated for impairment, Balance in allowance                   513
Individually evaluated for impairment, Related loan balance 854               854 2,345
Collectively evaluated for impairment:                    
Collectively evaluated for impairment, Balance in allowance 864               864 548
Collectively evaluated for impairment, Related loan balance 81,783               81,783 79,580
Indirect                    
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance, beginning of year       774         774 693
Charged off                 (341) (458)
Recoveries                 183 286
Provision for loan losses                 372 253
Balance, end of year 988       693       988 774
Collectively evaluated for impairment:                    
Collectively evaluated for impairment, Balance in allowance 988               988 774
Collectively evaluated for impairment, Related loan balance 116,698               116,698 85,186
Commercial                    
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance, beginning of year       237         237 284
Charged off                   (9)
Recoveries                 14  
Provision for loan losses                 (10) (38)
Balance, end of year 241       284       241 237
Individually evaluated for impairment:                    
Individually evaluated for impairment, Balance in allowance 204               204 217
Individually evaluated for impairment, Related loan balance 204               204 217
Collectively evaluated for impairment:                    
Collectively evaluated for impairment, Balance in allowance 37               37 20
Collectively evaluated for impairment, Related loan balance 14,080               14,080 11,040
Construction                    
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance, beginning of year       12         12 10
Provision for loan losses                 (8) 2
Balance, end of year 4       10       4 12
Collectively evaluated for impairment:                    
Collectively evaluated for impairment, Balance in allowance 4               4 12
Collectively evaluated for impairment, Related loan balance 2,317               2,317 3,536
Commercial Real Estate                    
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance, beginning of year       $ 291         291 259
Charged off                 (13)  
Recoveries                   14
Provision for loan losses                 5 18
Balance, end of year 283       259       283 291
Individually evaluated for impairment:                    
Individually evaluated for impairment, Related loan balance 1,054               1,054 1,176
Collectively evaluated for impairment:                    
Collectively evaluated for impairment, Balance in allowance 283               283 291
Collectively evaluated for impairment, Related loan balance 69,059               69,059 72,420
Unallocated                    
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance, beginning of year                   14
Provision for loan losses                   (14)
Balance, end of year         $ 14          
Commercial Mortgage Portfolio Segment                    
Individually evaluated for impairment:                    
Individually evaluated for impairment, Balance in allowance $ 204               $ 204 $ 217