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LOANS AND ASSET QUALITY - Total Allowance by Loan Segment (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance, beginning of year $ 2,484 $ 3,150 $ 3,150
Provision for credit losses 243   868
Recoveries 253   379
Loans charged off (357) (1,378) (1,913)
Balance, end of year 2,623   2,484
Individually evaluated for impairment:      
Individually evaluated for impairment, Balance in allowance 810   531
Individually evaluated for impairment, Related loan balance 1,740   5,017
Collectively evaluated for impairment:      
Collectively evaluated for impairment, Balance in allowance 1,813   1,953
Collectively evaluated for impairment, Related loan balance 270,705   261,090
Commercial and Industrial      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance, beginning of year 284 305 305
Provision for credit losses (37)   (30)
Recoveries     9
Balance, end of year 247   284
Individually evaluated for impairment:      
Individually evaluated for impairment, Balance in allowance 220   229
Individually evaluated for impairment, Related loan balance 220   229
Collectively evaluated for impairment:      
Collectively evaluated for impairment, Balance in allowance 27   56
Collectively evaluated for impairment, Related loan balance 3,824   4,451
Commercial Real Estate      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance, beginning of year 259 262 262
Provision for credit losses 4   361
Recoveries 14    
Loans charged off     (364)
Balance, end of year 277   259
Individually evaluated for impairment:      
Individually evaluated for impairment, Related loan balance     1,413
Collectively evaluated for impairment:      
Collectively evaluated for impairment, Balance in allowance 277   259
Collectively evaluated for impairment, Related loan balance 68,766   68,009
Consumer and Indirect      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance, beginning of year 876 804 804
Provision for credit losses 246   431
Recoveries 212   336
Loans charged off (354) (524) (695)
Balance, end of year 980   876
Individually evaluated for impairment:      
Individually evaluated for impairment, Balance in allowance 58   50
Individually evaluated for impairment, Related loan balance 175   503
Collectively evaluated for impairment:      
Collectively evaluated for impairment, Balance in allowance 922   826
Collectively evaluated for impairment, Related loan balance 95,873   83,078
Residential Real estate      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance, beginning of year 1,051 1,631 1,631
Provision for credit losses 44   240
Recoveries 27   34
Loans charged off (3) (854) (854)
Balance, end of year 1,119   1,051
Individually evaluated for impairment:      
Individually evaluated for impairment, Balance in allowance 532   252
Individually evaluated for impairment, Related loan balance 1,345   2,872
Collectively evaluated for impairment:      
Collectively evaluated for impairment, Balance in allowance 587   799
Collectively evaluated for impairment, Related loan balance 102,242   105,552
Unallocated      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance, beginning of year 14 $ 148 148
Provision for credit losses $ (14)   (134)
Balance, end of year     14
Collectively evaluated for impairment:      
Collectively evaluated for impairment, Balance in allowance     $ 13