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Premises and equipment, net - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, Plant and Equipment |  |  |
Depreciation of premises and equipment | $ 1,950 | $ 1,661 | $ 1,595
Rent expense | $ 407 | $ 416 | $ 397
Minimum |  |  |
Property, Plant and Equipment |  |  |
Leases extension period | 1 year |  |
Maximum |  |  |
Property, Plant and Equipment |  |  |
Leases extension period | 10 years |  |

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- Definition The period over which the leases contain options to extend. + References No definition available. + Details
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- Definition The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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