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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (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

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+ References

No definition available.

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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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