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Loans, net and allowance for loan losses - Information Concerning Nonaccrual Loans by Major Loan Classification (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Financing Receivable, Recorded Investment, Past Due |  |
Nonaccrual loans, Total | $ 8,678 | $ 7,852
Commercial |  |
Financing Receivable, Recorded Investment, Past Due |  |
Nonaccrual loans, Total | 770 | 860
Real estate Commercial |  |
Financing Receivable, Recorded Investment, Past Due |  |
Nonaccrual loans, Total | 4,719 | 3,821
Real estate Residential |  |
Financing Receivable, Recorded Investment, Past Due |  |
Nonaccrual loans, Total | 3,020 | 2,994
Consumer |  |
Financing Receivable, Recorded Investment, Past Due |  |
Nonaccrual loans, Total | $ 169 | $ 177

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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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