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Basis of presentation and summary of significant accounting policies (Schedule of Premises and Equipment) (Details)
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12 Months Ended |
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Dec. 31, 2014
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| Land Improvements | Minimum |
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| Property, Plant and Equipment [Line Items] |
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| Premises and equipment, useful life |
3 years |
| Land Improvements | Maximum |
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| Property, Plant and Equipment [Line Items] |
|
| Premises and equipment, useful life |
15 years |
| Building | Minimum |
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| Property, Plant and Equipment [Line Items] |
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| Premises and equipment, useful life |
5 years |
| Building | Maximum |
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| Property, Plant and Equipment [Line Items] |
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| Premises and equipment, useful life |
39 years |
| Computer | Minimum |
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| Property, Plant and Equipment [Line Items] |
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| Premises and equipment, useful life |
3 years |
| Computer | Maximum |
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| Property, Plant and Equipment [Line Items] |
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| Premises and equipment, useful life |
5 years |
| Furniture, Fixtures, and Other Equipment | Minimum |
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| Property, Plant and Equipment [Line Items] |
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| Premises and equipment, useful life |
3 years |
| Furniture, Fixtures, and Other Equipment | Maximum |
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| Property, Plant and Equipment [Line Items] |
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| Premises and equipment, useful life |
15 years |