Fair value - Financial instruments measured at fair value (Details) - USD ($)
$ in Thousands |
9 Months Ended |
12 Months Ended |
Sep. 30, 2020 |
Dec. 31, 2019 |
| Impaired Loans Real Estate Secured [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, Fair Value Disclosure |
$ 1,368
|
$ 1,468
|
| Impaired Loans Real Estate Secured [Member] | Appraisal or Internal Valuation Technique [Member] | Minimum [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Selling costs |
6.00%
|
6.00%
|
| Discount for lack of marketability and age of appraisal |
6.00%
|
6.00%
|
| Impaired Loans Real Estate Secured [Member] | Appraisal or Internal Valuation Technique [Member] | Maximum [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Selling costs |
10.00%
|
10.00%
|
| Discount for lack of marketability and age of appraisal |
30.00%
|
30.00%
|
| Impaired Loans Real Estate Secured [Member] | Appraisal or Internal Valuation Technique [Member] | Weighted Average [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Selling costs |
(7.00%)
|
(7.00%)
|
| Discount for lack of marketability and age of appraisal |
(10.00%)
|
(10.00%)
|
| Asset Held For Sale [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, Fair Value Disclosure |
|
$ 514
|
| Asset Held For Sale [Member] | Appraisal or Internal Valuation Technique [Member] | Minimum [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Selling costs |
|
6.00%
|
| Discount for lack of marketability and age of appraisal |
|
6.00%
|
| Asset Held For Sale [Member] | Appraisal or Internal Valuation Technique [Member] | Maximum [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Selling costs |
|
10.00%
|
| Discount for lack of marketability and age of appraisal |
|
30.00%
|
| Asset Held For Sale [Member] | Appraisal or Internal Valuation Technique [Member] | Weighted Average [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Selling costs |
|
(7.00%)
|
| Discount for lack of marketability and age of appraisal |
|
(15.00%)
|
| Other Real Estate Owned [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, Fair Value Disclosure |
$ 336
|
$ 526
|
| Other Real Estate Owned [Member] | Appraisal or Internal Valuation Technique [Member] | Minimum [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Selling costs |
6.00%
|
6.00%
|
| Other Real Estate Owned [Member] | Appraisal or Internal Valuation Technique [Member] | Maximum [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Selling costs |
10.00%
|
10.00%
|
| Other Real Estate Owned [Member] | Appraisal or Internal Valuation Technique [Member] | Weighted Average [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Selling costs |
(7.00%)
|
(7.00%)
|