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Commitments, guarantees and contingencies (Summary of the Bank's Off-balance Sheet Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
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Dec. 31, 2013
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|---|---|---|
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Off-balance sheet financial instruments | $ 404,894 | $ 272,388 |
| Commitments to extend credit | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Off-balance sheet financial instruments | 371,871 | 245,906 |
| Commitments under credit card lines of credit | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Off-balance sheet financial instruments | 28,822 | 24,321 |
| Standby letters of credit | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Off-balance sheet financial instruments | $ 4,201 | $ 2,161 |