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Loans - Additional Information Regarding Impaired Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Loans [Line Items]    
Unpaid principal balance, Total $ 44,549 $ 42,726
Recorded investment of impaired loans 32,743 31,079
Loans and Leases Receivable, Allowance 1,546 1,169
Commercial and Industrial [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 4,558 4,374
Recorded investment with no related allowance recorded 3,173 3,029
Unpaid principal balance of impaired loans with an allowance recorded 7,736 7,252
Recorded investment of impaired loans with an allowance recorded 5,109 4,627
Allowance for loan losses allocated with an allowance recorded 1,348 996
Food and Agriculture [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 1,468 1,468
Recorded investment with no related allowance recorded 1,220 1,260
Unpaid principal balance of impaired loans with an allowance recorded 997 883
Recorded investment of impaired loans with an allowance recorded 960 845
Allowance for loan losses allocated with an allowance recorded 33 46
Energy Loans [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 5,429 5,366
Recorded investment with no related allowance recorded 804 742
Commercial Loan [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 18,430 18,338
Recorded investment with no related allowance recorded 11,602 11,640
Unpaid principal balance of impaired loans with an allowance recorded 10,050 9,497
Recorded investment of impaired loans with an allowance recorded 7,184 6,641
Allowance for loan losses allocated with an allowance recorded 1,471 1,132
Commercial Construction [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 1,435 1,435
Recorded investment with no related allowance recorded 1,208 1,208
Commercial Acquisition/Development [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 377 378
Recorded investment with no related allowance recorded 115 121
Owner-Occupied [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 6,975 7,130
Recorded investment with no related allowance recorded 6,405 6,609
Unpaid principal balance of impaired loans with an allowance recorded 1,317 1,362
Recorded investment of impaired loans with an allowance recorded 1,115 1,169
Allowance for loan losses allocated with an allowance recorded 90 90
Non Owner-Occupied [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 642 641
Recorded investment with no related allowance recorded 546 547
Unpaid principal balance of impaired loans with an allowance recorded 620 313
Recorded investment of impaired loans with an allowance recorded 561 254
Allowance for loan losses allocated with an allowance recorded 39 2
Total Commercial Real Estate [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 2,454 2,454
Recorded investment with no related allowance recorded 1,869 1,876
Unpaid principal balance of impaired loans with an allowance recorded 620 313
Recorded investment of impaired loans with an allowance recorded 561 254
Allowance for loan losses allocated with an allowance recorded 39 2
Senior lien    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 4,667 4,229
Recorded investment with no related allowance recorded 4,310 3,814
Unpaid principal balance of impaired loans with an allowance recorded 6,492 6,032
Recorded investment of impaired loans with an allowance recorded 5,582 5,178
Allowance for loan losses allocated with an allowance recorded 28 27
Junior lien    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 430 409
Recorded investment with no related allowance recorded 358 341
Unpaid principal balance of impaired loans with an allowance recorded 1,320 1,408
Recorded investment of impaired loans with an allowance recorded 1,196 1,293
Allowance for loan losses allocated with an allowance recorded 8 8
Residential Real Estate Segment [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 5,097 4,638
Recorded investment with no related allowance recorded 4,668 4,155
Unpaid principal balance of impaired loans with an allowance recorded 7,812 7,440
Recorded investment of impaired loans with an allowance recorded 6,778 6,471
Allowance for loan losses allocated with an allowance recorded 36 35
Consumer [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 86 46
Recorded investment with no related allowance recorded 81 42
Impaired Loans With No Related Allowance Recorded [Member] [Member]    
Loans [Line Items]    
Unpaid principal balance with no related allowance recorded 26,067 25,476
Recorded investment with no related allowance recorded 18,220 17,713
Impaired Loans With Related Allowance Recorded [Member]    
Loans [Line Items]    
Unpaid principal balance of impaired loans with an allowance recorded 18,482 17,250
Recorded investment of impaired loans with an allowance recorded 14,523 13,366
Allowance for loan losses allocated with an allowance recorded $ 1,546 $ 1,169