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Loans and Allowance for Loan Losses - Loans by risk category (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Loans outstanding by loan portfolio segment and risk category
Loans	$ 1,800,386	$ 1,979,375
Pass
Loans outstanding by loan portfolio segment and risk category
Loans	1,769,176	1,922,704
Special Mention
Loans outstanding by loan portfolio segment and risk category
Loans	4,093	15,326
Substandard
Loans outstanding by loan portfolio segment and risk category
Loans	26,870	41,345
Doubtful
Loans outstanding by loan portfolio segment and risk category
Loans	247
Commercial
Loans outstanding by loan portfolio segment and risk category
Loans	1,117,868	1,299,316
Commercial | Pass
Loans outstanding by loan portfolio segment and risk category
Loans	1,089,444	1,247,786
Commercial | Special Mention
Loans outstanding by loan portfolio segment and risk category
Loans	4,093	12,101
Commercial | Substandard
Loans outstanding by loan portfolio segment and risk category
Loans	24,084	39,429
Commercial | Doubtful
Loans outstanding by loan portfolio segment and risk category
Loans	247
Commercial | Commercial and industrial
Loans outstanding by loan portfolio segment and risk category
Loans	506,599	691,858
Commercial | Commercial and industrial | Pass
Loans outstanding by loan portfolio segment and risk category
Loans	498,201	669,602
Commercial | Commercial and industrial | Special Mention
Loans outstanding by loan portfolio segment and risk category
Loans	1,777	5,415
Commercial | Commercial and industrial | Substandard
Loans outstanding by loan portfolio segment and risk category
Loans	6,374	16,841
Commercial | Commercial and industrial | Doubtful
Loans outstanding by loan portfolio segment and risk category
Loans	247
Commercial | Real estate construction
Loans outstanding by loan portfolio segment and risk category
Loans	37,751	44,451
Commercial | Real estate construction | Pass
Loans outstanding by loan portfolio segment and risk category
Loans	37,751	44,451
Commercial | Commercial real estate
Loans outstanding by loan portfolio segment and risk category
Loans	573,518	563,007
Commercial | Commercial real estate | Pass
Loans outstanding by loan portfolio segment and risk category
Loans	553,492	533,733
Commercial | Commercial real estate | Special Mention
Loans outstanding by loan portfolio segment and risk category
Loans	2,316	6,686
Commercial | Commercial real estate | Substandard
Loans outstanding by loan portfolio segment and risk category
Loans	17,710	22,588
Consumer
Loans outstanding by loan portfolio segment and risk category
Loans	682,518	680,059
Consumer | Pass
Loans outstanding by loan portfolio segment and risk category
Loans	679,732	674,918
Consumer | Special Mention
Loans outstanding by loan portfolio segment and risk category
Loans		3,225
Consumer | Substandard
Loans outstanding by loan portfolio segment and risk category
Loans	2,786	1,916
Consumer | Residential | Real estate first mortgage
Loans outstanding by loan portfolio segment and risk category
Loans	501,339	463,370
Consumer | Residential | Real estate first mortgage | Pass
Loans outstanding by loan portfolio segment and risk category
Loans	499,497	461,221
Consumer | Residential | Real estate first mortgage | Special Mention
Loans outstanding by loan portfolio segment and risk category
Loans		1,406
Consumer | Residential | Real estate first mortgage | Substandard
Loans outstanding by loan portfolio segment and risk category
Loans	1,842	743
Consumer | Residential | Real estate junior lien
Loans outstanding by loan portfolio segment and risk category
Loans	130,243	143,416
Consumer | Residential | Real estate junior lien | Pass
Loans outstanding by loan portfolio segment and risk category
Loans	129,303	140,461
Consumer | Residential | Real estate junior lien | Special Mention
Loans outstanding by loan portfolio segment and risk category
Loans		1,819
Consumer | Residential | Real estate junior lien | Substandard
Loans outstanding by loan portfolio segment and risk category
Loans	940	1,136
Consumer | Other revolving and installment
Loans outstanding by loan portfolio segment and risk category
Loans	50,936	73,273
Consumer | Other revolving and installment | Pass
Loans outstanding by loan portfolio segment and risk category
Loans	50,932	73,236
Consumer | Other revolving and installment | Substandard
Loans outstanding by loan portfolio segment and risk category
Loans	$ 4	$ 37

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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=121593590&loc=d3e4428-111522

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