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Loans, net and allowance for loan losses - Major Classification of Loans Portfolio Summarized by Credit Quality (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable
Loans, net	$ 1,725,781	$ 1,693,065
Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	467,404	476,199
Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	833,497	786,210
Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans, net	289,367	287,935
Consumer
Accounts, Notes, Loans and Financing Receivable
Loans, net	135,513	142,721
Pass
Accounts, Notes, Loans and Financing Receivable
Loans, net	1,686,377	1,661,496
Pass | Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	462,244	472,185
Pass | Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	804,815	764,320
Pass | Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans, net	284,005	282,484
Pass | Consumer
Accounts, Notes, Loans and Financing Receivable
Loans, net	135,313	142,507
Special Mention
Accounts, Notes, Loans and Financing Receivable
Loans, net	18,339	14,991
Special Mention | Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	1,192	1,958
Special Mention | Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	17,130	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	21,065	16,578
Substandard | Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	3,968	2,056
Substandard | Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans, net	11,552	8,875
Substandard | Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans, net	5,345	5,433
Substandard | Consumer
Accounts, Notes, Loans and Financing Receivable
Loans, net	$ 200	$ 214

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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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