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Loans, net and allowance for loan losses - Major Classification of Loans by Past Due Status (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | $ 14,647 | $ 21,260
Current | 1,617,868 | 1,511,705
Total Loans | 1,632,515 | 1,532,965
Loans > 90 Days and Accruing | 1,510 | 844
30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 3,693 | 8,093
60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 723 | 1,215
Greater than 90 Days |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 10,231 | 11,952
Commercial |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 1,607 | 1,258
Current | 447,857 | 407,556
Total Loans | 449,464 | 408,814
Commercial | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 260 | 249
Commercial | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 84 | 75
Commercial | Greater than 90 Days |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 1,263 | 934
Real estate Commercial |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 5,199 | 12,325
Current | 746,311 | 687,819
Total Loans | 751,510 | 700,144
Real estate Commercial | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 831 | 4,782
Real estate Commercial | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 135 | 527
Real estate Commercial | Greater than 90 Days |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 4,233 | 7,016
Real estate Residential |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 6,215 | 6,015
Current | 283,367 | 283,766
Total Loans | 289,582 | 289,781
Loans > 90 Days and Accruing | 1,281 | 558
Real estate Residential | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 1,756 | 2,100
Real estate Residential | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 147 | 354
Real estate Residential | Greater than 90 Days |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 4,312 | 3,561
Consumer |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 1,626 | 1,662
Current | 140,333 | 132,564
Total Loans | 141,959 | 134,226
Loans > 90 Days and Accruing | 229 | 286
Consumer | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 846 | 962
Consumer | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | 357 | 259
Consumer | Greater than 90 Days |  |
Financing Receivable, Recorded Investment, Past Due |  |
Total Past Due | $ 423 | $ 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 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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