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Loans, net and allowance for loan losses - Major Classification of Loans by Past Due Status (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | $ 17,226 | $ 14,993
Current | 1,708,555 | 1,678,072
Total Loans | 1,725,781 | 1,693,065
Loans > 90 Days and Accruing | 435 | 735
30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 6,557 | 4,081
60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 1,556 | 2,325
Greater than 90 Days |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 9,113 | 8,587
Commercial |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 891 | 1,200
Current | 466,513 | 474,999
Total Loans | 467,404 | 476,199
Loans > 90 Days and Accruing | 3 |
Commercial | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 99 | 124
Commercial | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 18 | 216
Commercial | Greater than 90 Days |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 774 | 860
Real estate Commercial |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 9,743 | 5,737
Current | 823,754 | 780,473
Total Loans | 833,497 | 786,210
Real estate Commercial | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 4,608 | 1,722
Real estate Commercial | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 416 | 194
Real estate Commercial | Greater than 90 Days |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 4,719 | 3,821
Real estate Residential |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 5,430 | 6,228
Current | 283,937 | 281,707
Total Loans | 289,367 | 287,935
Loans > 90 Days and Accruing | 325 | 549
Real estate Residential | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 1,305 | 1,134
Real estate Residential | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 780 | 1,551
Real estate Residential | Greater than 90 Days |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 3,345 | 3,543
Consumer |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 1,162 | 1,828
Current | 134,351 | 140,893
Total Loans | 135,513 | 142,721
Loans > 90 Days and Accruing | 107 | 186
Consumer | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 545 | 1,101
Consumer | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 342 | 364
Consumer | Greater than 90 Days |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | $ 275 | $ 363

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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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