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Time deposits (Narrative) (Details) (USD $)
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Dec. 31, 2014
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Dec. 31, 2013
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|---|---|---|
| Time Deposits, Type [Line Items] | ||
| Time Deposits, $100,000 or More | $ 113,700,000 | $ 92,700,000 |
| Wholesale Brokered Time Deposits | ||
| Time Deposits, Type [Line Items] | ||
| Time Deposits | $ 0 | $ 0 |