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Loans and allowance for credit losses - Impaired Loans Recognized, Segregated by Class (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
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 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 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
Residential real estate: | Multi-family mortgage  
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 0
Impaired loan with no related allowance, unpaid principal 0
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