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Loans and allowance for credit losses - Impaired Loans Recognized, Segregated by Class (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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Financing Receivable, Impaired [Line Items] |
Impaired loans with related allowance, recorded investment | $ 14,126
Impaired loans with related allowance, unpaid principal | 16,881
Impaired loans with related allowance, related allowance | 895
Impaired loan with no related allowance, recorded investment | 9,684
Impaired loan with no related allowance, unpaid principal | 11,759
Total impaired loans, recorded investment | 23,810
Total impaired loans, unpaid principal | 28,640
Commercial and industrial |
Financing Receivable, Impaired [Line Items] |
Impaired loans with related allowance, recorded investment | 6,080
Impaired loans with related allowance, unpaid principal | 8,350
Impaired loans with related allowance, related allowance | 241
Impaired loan with no related allowance, recorded investment | 2,946
Impaired loan with no related allowance, unpaid principal | 3,074
Construction |
Financing Receivable, Impaired [Line Items] |
Impaired loan with no related allowance, recorded investment | 2,061
Impaired loan with no related allowance, unpaid principal | 2,499
Residential real estate: | 1-to-4 family mortgage |
Financing Receivable, Impaired [Line Items] |
Impaired loans with related allowance, recorded investment | 264
Impaired loans with related allowance, unpaid principal | 324
Impaired loans with related allowance, related allowance | 8
Impaired loan with no related allowance, recorded investment | 1,083
Impaired loan with no related allowance, unpaid principal | 1,449
Residential real estate: | Residential line of credit |
Financing Receivable, Impaired [Line Items] |
Impaired loans with related allowance, recorded investment | 320
Impaired loans with related allowance, unpaid principal | 320
Impaired loans with related allowance, related allowance | 9
Impaired loan with no related allowance, recorded investment | 259
Impaired loan with no related allowance, unpaid principal | 280
Commercial real estate: | Owner occupied |
Financing Receivable, Impaired [Line Items] |
Impaired loans with related allowance, recorded investment | 756
Impaired loans with related allowance, unpaid principal | 1,140
Impaired loans with related allowance, related allowance | 238
Impaired loan with no related allowance, recorded investment | 2,237
Impaired loan with no related allowance, unpaid principal | 2,627
Commercial real estate: | Non-owner occupied |
Financing Receivable, Impaired [Line Items] |
Impaired loans with related allowance, recorded investment | 6,706
Impaired loans with related allowance, unpaid principal | 6,747
Impaired loans with related allowance, related allowance | 399
Impaired loan with no related allowance, recorded investment | 1,049
Impaired loan with no related allowance, unpaid principal | 1,781
Consumer and other |
Financing Receivable, Impaired [Line Items] |
Impaired loans with related allowance, recorded investment | 0
Impaired loans with related allowance, unpaid principal | 0
Impaired loans with related allowance, related allowance | 0
Impaired loan with no related allowance, recorded investment | 49
Impaired loan with no related allowance, unpaid principal | $ 49

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