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Loans, net and allowance for loan losses - Major Classification of Loans by Past Due Status (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | $ 14,993 | $ 21,260 |
Current | 1,678,072 | 1,511,705 |
Total Loans | 1,693,065 | 1,532,965 | $ 1,340,865
Loans > 90 Days and Accruing | 735 | 844 |
30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 4,081 | 8,093 |
60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 2,325 | 1,215 |
Greater than 90 Days |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 8,587 | 11,952 |
Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 1,200 | 1,258 |
Current | 474,999 | 407,556 |
Total Loans | 476,199 | 408,814 | 365,767
Commercial | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 124 | 249 |
Commercial | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 216 | 75 |
Commercial | Greater than 90 Days |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 860 | 934 |
Real estate Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 5,737 | 12,325 |
Current | 780,473 | 687,819 |
Total Loans | 786,210 | 700,144 | 567,277
Real estate Commercial | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 1,722 | 4,782 |
Real estate Commercial | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 194 | 527 |
Real estate Commercial | Greater than 90 Days |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 3,821 | 7,016 |
Real estate Residential |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 6,228 | 6,015 |
Current | 281,707 | 283,766 |
Total Loans | 287,935 | 289,781 | 306,218
Loans > 90 Days and Accruing | 549 | 558 |
Real estate Residential | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 1,134 | 2,100 |
Real estate Residential | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 1,551 | 354 |
Real estate Residential | Greater than 90 Days |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 3,543 | 3,561 |
Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 1,828 | 1,662 |
Current | 140,893 | 132,564 |
Total Loans | 142,721 | 134,226 | $ 101,603
Loans > 90 Days and Accruing | 186 | 286 |
Consumer | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 1,101 | 962 |
Consumer | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | 364 | 259 |
Consumer | Greater than 90 Days |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |
Total Past Due | $ 363 | $ 441 |

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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + 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 (d) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at 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 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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