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Loans, net and allowance for loan losses - Loans Modified Resulting in Troubled Debt Restructurings (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) contract | Dec. 31, 2016 USD ($) contract | Dec. 31, 2015 USD ($) contract
Loans in the formal process of foreclosure | $ 1,684,000 | $ 1,529,000 |
Number of loans modified | contract | 6 | 3 | 9
Pre-Modification Outstanding Recorded Investment | $ 1,670,000 | $ 1,716,000 |
Post-Modification Outstanding Recorded Investment | 1,670,000 | 1,366,000 |
Recorded Investment | 1,628,000 | 1,357,000 |
Number of defaults on loans restructured |  | 1 | $ 2
Loans modified as troubled debt restructuring |  | 43,000 | 166,000
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk | $ 3,074,000 | $ 1,909,000 | $ 2,861,000
Commercial |  |  |
Number of loans modified | contract | 2 | 1 |
Pre-Modification Outstanding Recorded Investment | $ 885,000 | $ 1,500,000 |
Post-Modification Outstanding Recorded Investment | 885,000 | 1,150,000 |
Recorded Investment | $ 864,000 | $ 1,150,000 |
Real estate Commercial |  |  |
Number of loans modified | contract | 3 |  |
Pre-Modification Outstanding Recorded Investment | $ 721,000 |  |
Post-Modification Outstanding Recorded Investment | 721,000 |  |
Recorded Investment | $ 700,000 |  |
Real estate Residential |  |  |
Number of loans modified | contract | 1 | 2 |
Pre-Modification Outstanding Recorded Investment | $ 64,000 | $ 216,000 |
Post-Modification Outstanding Recorded Investment | 64,000 | 216,000 |
Recorded Investment | $ 64,000 | $ 207,000 |

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- Definition Loans made to related parties which are considered nonaccrual, past due, restructured or a potential credit risk. + References No definition available. + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL49126937-111524 + Details
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