Fair value (Details 1) - USD ($)
$ in Thousands |
9 Months Ended |
12 Months Ended |
Sep. 30, 2017 |
Dec. 31, 2016 |
| Impaired Loans Real Estate Secured [Member] |
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
|
| Assets held for sale |
|
$ 287
|
$ 517
|
| Impaired Loans Real Estate Secured [Member] | Appraisal or Internal Valuation Technique [Member] |
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
|
| Fair Value Measurements, Valuation Techniques |
[1],[2] |
Appraisal or Internal Valuation
|
Appraisal or Internal Valuation
|
| Impaired Loans Real Estate Secured [Member] | Appraisal or Internal Valuation Technique [Member] | Minimum [Member] |
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [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 Inputs, Assets, Quantitative Information [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 Inputs, Assets, Quantitative Information [Line Items] |
|
|
|
| Selling costs |
|
7.00%
|
7.00%
|
| Discount for lack of marketability and age of appraisal |
|
10.00%
|
10.00%
|
| Impaired Loans Non Real Estate Secured [Member] |
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
|
| Assets held for sale |
|
$ 1,248
|
$ 457
|
| Impaired Loans Non Real Estate Secured [Member] | Appraisal or Discounted Cash Flow Valuation Technique [Member] |
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
|
| Fair Value Measurements, Valuation Techniques |
[1] |
Appraisal or Discounted Cash Flow
|
Appraisal or Discounted Cash Flow
|
| Selling costs |
|
10.00%
|
10.00%
|
| Impaired Loans Non Real Estate Secured [Member] | Appraisal or Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] |
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
|
| Discount for lack of marketability and age of appraisal |
|
0.00%
|
0.00%
|
| Impaired Loans Non Real Estate Secured [Member] | Appraisal or Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] |
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
|
| Discount for lack of marketability and age of appraisal |
|
50.00%
|
50.00%
|
| Impaired Loans Non Real Estate Secured [Member] | Appraisal or Discounted Cash Flow Valuation Technique [Member] | Weighted Average [Member] |
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
|
| Discount for lack of marketability and age of appraisal |
|
20.00%
|
20.00%
|
| Asset Held For Sale [Member] |
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
|
| Assets held for sale |
|
$ 841
|
$ 841
|
| Asset Held For Sale [Member] | Appraisal or Internal Valuation Technique [Member] |
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
|
| Fair Value Measurements, Valuation Techniques |
[1],[2] |
Appraisal or Internal Valuation
|
Appraisal or Internal Valuation
|
| Asset Held For Sale [Member] | Appraisal or Internal Valuation Technique [Member] | Minimum [Member] |
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
|
| Selling costs |
|
6.00%
|
6.00%
|
| Discount for lack of marketability and age of appraisal |
|
6.00%
|
6.00%
|
| Asset Held For Sale [Member] | Appraisal or Internal Valuation Technique [Member] | Maximum [Member] |
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
|
| Selling costs |
|
10.00%
|
10.00%
|
| Discount for lack of marketability and age of appraisal |
|
30.00%
|
30.00%
|
| Asset Held For Sale [Member] | Appraisal or Internal Valuation Technique [Member] | Weighted Average [Member] |
|
|
|
| Fair Value Inputs, Assets, Quantitative Information [Line Items] |
|
|
|
| Selling costs |
|
7.00%
|
7.00%
|
| Discount for lack of marketability and age of appraisal |
|
15.00%
|
15.00%
|
|
|