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Loans and Allowance for Credit Losses - Impaired loans, by class of loan (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Impaired Financing Receivable, Unpaid Principal Balance |  |  | $ 54,883
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  | 35,235
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  | 19,648
Impaired Financing Receivable, Recorded Investment |  |  | 54,883
Impaired Financing Receivable, Related Allowance |  |  | 9,124
Impaired Financing Receivable, Average Recorded Investment |  |  | 54,258
Interest income, accrual method | $ 282 | $ 598 | 941
Commercial |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  |  | 15,814
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  | 11,858
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  | 3,956
Impaired Financing Receivable, Recorded Investment |  |  | 15,814
Impaired Financing Receivable, Related Allowance |  |  | 5,714
Impaired Financing Receivable, Average Recorded Investment |  |  | 15,682
Interest income, accrual method |  |  | 270
Income producing - commercial real estate |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  |  | 14,093
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  | 2,713
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  | 11,380
Impaired Financing Receivable, Recorded Investment |  |  | 14,093
Impaired Financing Receivable, Related Allowance |  |  | 2,145
Impaired Financing Receivable, Average Recorded Investment |  |  | 18,133
Interest income, accrual method |  |  | 382
Owner occupied - Commercial real estate |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  |  | 7,349
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  | 6,388
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  | 961
Impaired Financing Receivable, Recorded Investment |  |  | 7,349
Impaired Financing Receivable, Related Allowance |  |  | 415
Impaired Financing Receivable, Average Recorded Investment |  |  | 6,107
Interest income, accrual method |  |  | 197
Real estate mortgage residential |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  |  | 5,631
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  | 3,175
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  | 2,456
Impaired Financing Receivable, Recorded Investment |  |  | 5,631
Impaired Financing Receivable, Related Allowance |  |  | 650
Impaired Financing Receivable, Average Recorded Investment |  |  | 5,638
Construction - commercial and residential |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  |  | 11,509
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  | 11,101
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  | 408
Impaired Financing Receivable, Recorded Investment |  |  | 11,509
Impaired Financing Receivable, Related Allowance |  |  | 100
Impaired Financing Receivable, Average Recorded Investment |  |  | 8,211
Interest income, accrual method |  |  | 92
Home equity |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  |  | 487
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  | 487
Impaired Financing Receivable, Recorded Investment |  |  | 487
Impaired Financing Receivable, Related Allowance |  |  | 100
Impaired Financing Receivable, Average Recorded Investment |  |  | $ 487

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