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Loans, net and allowance for loan losses - Major Classification of Loans Portfolio Summarized by Credit Quality (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable
Loans, net	$ 1,693,065	$ 1,532,965	$ 1,340,865
Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	476,199	408,814	365,767
Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	786,210	700,144	567,277
Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans, net	287,935	289,781	306,218
Consumer
Accounts, Notes, Loans and Financing Receivable
Loans, net	142,721	134,226	$ 101,603
Pass
Accounts, Notes, Loans and Financing Receivable
Loans, net	1,661,496	1,490,501
Pass | Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	472,185	398,867
Pass | Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	764,320	674,914
Pass | Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans, net	282,484	282,737
Pass | Consumer
Accounts, Notes, Loans and Financing Receivable
Loans, net	142,507	133,983
Special Mention
Accounts, Notes, Loans and Financing Receivable
Loans, net	14,991	16,847
Special Mention | Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	1,958	6,222
Special Mention | Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	13,015	10,392
Special Mention | Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans, net	18	233
Substandard
Accounts, Notes, Loans and Financing Receivable
Loans, net	16,578	25,617
Substandard | Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	2,056	3,725
Substandard | Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	8,875	14,838
Substandard | Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans, net	5,433	6,811
Substandard | Consumer
Accounts, Notes, Loans and Financing Receivable
Loans, net	$ 214	$ 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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