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Loans, net and allowance for loan losses - Major Classification of Loans Portfolio Summarized by Credit Quality (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable
Loans, net	$ 1,632,515	$ 1,532,965
Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	449,464	408,814
Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	751,510	700,144
Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans, net	289,582	289,781
Consumer
Accounts, Notes, Loans and Financing Receivable
Loans, net	141,959	134,226
Pass
Accounts, Notes, Loans and Financing Receivable
Loans, net	1,591,470	1,490,501
Pass | Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	441,503	398,867
Pass | Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	724,659	674,914
Pass | Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans, net	283,690	282,737
Pass | Consumer
Accounts, Notes, Loans and Financing Receivable
Loans, net	141,618	133,983
Special Mention
Accounts, Notes, Loans and Financing Receivable
Loans, net	19,777	16,847
Special Mention | Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	5,028	6,222
Special Mention | Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	14,730	10,392
Special Mention | Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans, net	19	233
Substandard
Accounts, Notes, Loans and Financing Receivable
Loans, net	21,268	25,617
Substandard | Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	2,933	3,725
Substandard | Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	12,121	14,838
Substandard | Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans, net	5,873	6,811
Substandard | Consumer
Accounts, Notes, Loans and Financing Receivable
Loans, net	$ 341	$ 243

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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

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