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Loans and Allowance for Loan Losses - Credit Quality (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 2,107,991	$ 1,843,286
Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,107,991	1,843,286
Pass | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,009,279	1,759,961
Special Mention | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	87,713	73,391
Substandard | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	10,999	9,934
Commercial loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	512,973	246,687
Commercial loans | Commercial and industrial | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	512,973	246,687
Commercial loans | Commercial and industrial | Pass | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	484,305	209,213
Commercial loans | Commercial and industrial | Special Mention | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	28,544	37,065
Commercial loans | Commercial and industrial | Substandard | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	124	409
Commercial real estate loans | Commercial real estate, owner-occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	299,754	308,824
Commercial real estate loans | Commercial real estate, owner-occupied | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	299,754	308,824
Commercial real estate loans | Commercial real estate, owner-occupied | Pass | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	251,741	264,766
Commercial real estate loans | Commercial real estate, owner-occupied | Special Mention | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	41,010	35,016
Commercial real estate loans | Commercial real estate, owner-occupied | Substandard | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	7,003	9,042
Commercial real estate loans | Commercial real estate, investor-owned
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	966,517	946,317
Commercial real estate loans | Commercial real estate, investor-owned | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	966,517	946,317
Commercial real estate loans | Commercial real estate, investor-owned | Pass | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	946,166	945,757
Commercial real estate loans | Commercial real estate, investor-owned | Special Mention | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	17,359	560
Commercial real estate loans | Commercial real estate, investor-owned | Substandard | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,992	0
Commercial real estate loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	66,663	61,095
Commercial real estate loans | Construction | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	66,663	61,095
Commercial real estate loans | Construction | Pass | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	66,663	61,095
Commercial real estate loans | Construction | Special Mention | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Commercial real estate loans | Construction | Substandard | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Residential loans | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	107,364	116,024
Residential loans | Home equity | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	107,364	116,024
Residential loans | Home equity | Pass | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	105,824	114,935
Residential loans | Home equity | Special Mention | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	800	750
Residential loans | Home equity | Substandard | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	740	339
Residential loans | Other residential
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	130,915	136,657
Residential loans | Other residential | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	130,915	136,657
Residential loans | Other residential | Pass | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	130,915	136,657
Residential loans | Other residential | Special Mention | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Residential loans | Other residential | Substandard | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Consumer loans | Installment and other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	23,805	27,682
Consumer loans | Installment and other consumer | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	23,805	27,682
Consumer loans | Installment and other consumer | Pass | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	23,665	27,538
Consumer loans | Installment and other consumer | Special Mention | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Consumer loans | Installment and other consumer | Substandard | Financial asset acquired and no credit deterioration
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 140	$ 144

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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=121593590&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=121611835&loc=d3e5074-111524

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