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Loans, net and allowance for loan losses - Major Classification of Loans Portfolio Summarized by Credit Quality (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable
Loans, net	$ 1,753,389	$ 1,693,065
Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	469,318	476,199
Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	867,349	786,210
Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans, net	290,831	287,935
Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans, net	290,831	287,935
Consumer
Accounts, Notes, Loans and Financing Receivable
Loans, net	125,891	142,721
Pass
Accounts, Notes, Loans and Financing Receivable
Loans, net	1,719,187	1,661,496
Pass | Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	465,880	472,185
Pass | Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	842,115	764,320
Pass | Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans, net	285,388	282,484
Pass | Consumer
Accounts, Notes, Loans and Financing Receivable
Loans, net	125,804	142,507
Special Mention
Accounts, Notes, Loans and Financing Receivable
Loans, net	13,560	14,991
Special Mention | Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	627	1,958
Special Mention | Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	12,916	13,015
Special Mention | Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans, net	17	18
Substandard
Accounts, Notes, Loans and Financing Receivable
Loans, net	20,642	16,578
Substandard | Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	2,811	2,056
Substandard | Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	12,318	8,875
Substandard | Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans, net	5,426	5,433
Substandard | Consumer
Accounts, Notes, Loans and Financing Receivable
Loans, net	$ 87	$ 214

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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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