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Loans and Allowance for Loan Losses - Loans by risk category (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Loans outstanding by loan portfolio segment and risk category
Loans	$ 2,034,197	$ 1,721,279
Pass
Loans outstanding by loan portfolio segment and risk category
Loans	1,976,683	1,654,719
Special Mention
Loans outstanding by loan portfolio segment and risk category
Loans	12,075	12,226
Substandard
Loans outstanding by loan portfolio segment and risk category
Loans	45,439	54,334
Commercial
Loans outstanding by loan portfolio segment and risk category
Loans	1,344,652	1,000,225
Commercial | Pass
Loans outstanding by loan portfolio segment and risk category
Loans	1,291,043	935,719
Commercial | Special Mention
Loans outstanding by loan portfolio segment and risk category
Loans	10,234	12,226
Commercial | Substandard
Loans outstanding by loan portfolio segment and risk category
Loans	43,375	52,280
Commercial | Commercial and industrial
Loans outstanding by loan portfolio segment and risk category
Loans	794,204	479,144
Commercial | Commercial and industrial | Pass
Loans outstanding by loan portfolio segment and risk category
Loans	768,851	448,306
Commercial | Commercial and industrial | Special Mention
Loans outstanding by loan portfolio segment and risk category
Loans	5,886	9,585
Commercial | Commercial and industrial | Substandard
Loans outstanding by loan portfolio segment and risk category
Loans	19,467	21,253
Commercial | Real estate construction
Loans outstanding by loan portfolio segment and risk category
Loans	31,344	26,378
Commercial | Real estate construction | Pass
Loans outstanding by loan portfolio segment and risk category
Loans	31,087	25,119
Commercial | Real estate construction | Special Mention
Loans outstanding by loan portfolio segment and risk category
Loans		282
Commercial | Real estate construction | Substandard
Loans outstanding by loan portfolio segment and risk category
Loans	257	977
Commercial | Commercial real estate
Loans outstanding by loan portfolio segment and risk category
Loans	519,104	494,703
Commercial | Commercial real estate | Pass
Loans outstanding by loan portfolio segment and risk category
Loans	491,105	462,294
Commercial | Commercial real estate | Special Mention
Loans outstanding by loan portfolio segment and risk category
Loans	4,348	2,359
Commercial | Commercial real estate | Substandard
Loans outstanding by loan portfolio segment and risk category
Loans	23,651	30,050
Consumer
Loans outstanding by loan portfolio segment and risk category
Loans	689,545	721,054
Consumer | Pass
Loans outstanding by loan portfolio segment and risk category
Loans	685,640	719,000
Consumer | Special Mention
Loans outstanding by loan portfolio segment and risk category
Loans	1,841
Consumer | Substandard
Loans outstanding by loan portfolio segment and risk category
Loans	2,064	2,054
Consumer | Residential | Real estate first mortgage
Loans outstanding by loan portfolio segment and risk category
Loans	456,737	457,155
Consumer | Residential | Real estate first mortgage | Pass
Loans outstanding by loan portfolio segment and risk category
Loans	455,973	456,358
Consumer | Residential | Real estate first mortgage | Substandard
Loans outstanding by loan portfolio segment and risk category
Loans	764	797
Consumer | Residential | Real estate junior lien
Loans outstanding by loan portfolio segment and risk category
Loans	154,351	177,373
Consumer | Residential | Real estate junior lien | Pass
Loans outstanding by loan portfolio segment and risk category
Loans	151,249	176,122
Consumer | Residential | Real estate junior lien | Special Mention
Loans outstanding by loan portfolio segment and risk category
Loans	1,841
Consumer | Residential | Real estate junior lien | Substandard
Loans outstanding by loan portfolio segment and risk category
Loans	1,261	1,251
Consumer | Other revolving and installment
Loans outstanding by loan portfolio segment and risk category
Loans	78,457	86,526
Consumer | Other revolving and installment | Pass
Loans outstanding by loan portfolio segment and risk category
Loans	78,418	86,520
Consumer | Other revolving and installment | Substandard
Loans outstanding by loan portfolio segment and risk category
Loans	$ 39	$ 6

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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

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