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Loans, net and allowance for loan losses - Net Deferred Loan Costs (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) loan | Dec. 31, 2014 USD ($) loan
Loans, net and allowance for loan losses |  |  |  |
Net deferred loan costs | $ 575,000 | $ 579,000 |  |
Loans outstanding to directors, executive officers, principal stockholders or to their affiliates | 15,169,000 | 15,614,000 |  |
Advances and repayments of loans receivable | 1,133,000 | 1,578,000 |  |
Number of related party loans classified as nonaccrual, past due, or restructured | 0 | 0 |  |
Donations to community foundation | 1,100,000 | 900,000 |  |
Deposits from related parties | 10,000,000 | 9,300,000 |  |
Interest income recognized using the cash-basis method on impaired loans | $ 0 | $ 0 | $ 0 |
Number of distressed loans | loan | 9 |  | 29 | 29
Credit adjustment on distressed loans | $ 1,430,000 |  | $ 6,892,000 | $ 6,892,000

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- Definition Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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- Definition For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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