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Loans, net and allowance for loan losses - Major Classification of Loans Portfolio Summarized by Credit Quality (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable
Loans	$ 1,938,240	$ 1,823,266	$ 1,693,065
Commercial
Accounts, Notes, Loans and Financing Receivable
Loans	$ 522,957	494,134	476,199
Relationships encountering some financial difficulty | item	2
Increase (decrease) in special mention loans	$ 2,500
Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans	1,011,423	907,803	786,210
Increase (decrease) in special mention loans	(5,100)
Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans	301,378	299,876	287,935
Increase (decrease) in substandard loans	(1,100)
Consumer
Accounts, Notes, Loans and Financing Receivable
Loans	102,482	121,453	$ 142,721
Pass
Accounts, Notes, Loans and Financing Receivable
Loans	1,908,233	1,795,367
Pass | Commercial
Accounts, Notes, Loans and Financing Receivable
Loans	513,994	491,531
Pass | Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans	993,645	886,849
Pass | Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans	298,449	295,758
Pass | Consumer
Accounts, Notes, Loans and Financing Receivable
Loans	102,145	121,229
Special Mention
Accounts, Notes, Loans and Financing Receivable
Loans	6,942	10,160
Special Mention | Commercial
Accounts, Notes, Loans and Financing Receivable
Loans	3,837	869
Special Mention | Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans	2,508	8,934
Special Mention | Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans	597	357
Substandard
Accounts, Notes, Loans and Financing Receivable
Loans	23,065	17,739
Substandard | Commercial
Accounts, Notes, Loans and Financing Receivable
Loans	5,126	1,734
Substandard | Real estate Commercial
Accounts, Notes, Loans and Financing Receivable
Loans	15,270	12,020
Substandard | Real estate Residential
Accounts, Notes, Loans and Financing Receivable
Loans	2,332	3,761
Substandard | Consumer
Accounts, Notes, Loans and Financing Receivable
Loans	$ 337	$ 224

X

- Definition

The number of loan receivable relationships encountering some financial difficulty.

+ References

No definition available.

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- Definition

The amount of increase (decrease) in special mention loans.

+ References

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- Definition

The amount of increase (decrease) in substandard loans.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524

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