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Loans and Allowance for Loan Losses - Outstanding and Aging Analysis (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 2,107,991,000	$ 1,843,286,000
Deferred loan fees	(5,100,000)	983,000
Unaccreted purchase discounts on non-PCI loans	878,000	983,000
Loans past due more than 90 days still accruing	0	0
SBA PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred loan fees	6,500,000
Commercial loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	512,973,000	246,687,000
Commercial loans | Commercial and industrial | SBA PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	301,700,000
Commercial real estate loans | Commercial real estate, owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	299,754,000	308,824,000
Commercial real estate loans | Commercial real estate, investor-owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	966,517,000	946,317,000
Commercial real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	66,663,000	61,095,000
Residential loans | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	107,364,000	116,024,000
Residential loans | Other residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	130,915,000	136,657,000
Consumer loans | Installment and other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	23,805,000	27,682,000
Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	698,000	1,648,000
Current	2,107,293,000	1,841,638,000
Total loans	2,107,991,000	1,843,286,000
Non-accrual	1,442,000	226,000
Financial asset, other than financial asset acquired with credit deterioration | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	415,000	1,288,000
Financial asset, other than financial asset acquired with credit deterioration | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	283,000	193,000
Financial asset, other than financial asset acquired with credit deterioration | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	167,000
Financial asset, other than financial asset acquired with credit deterioration | Commercial loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	198,000	1,000
Current	512,775,000	246,686,000
Total loans	512,973,000	246,687,000
Non-accrual	0	0
Financial asset, other than financial asset acquired with credit deterioration | Commercial loans | Commercial and industrial | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	198,000	1,000
Financial asset, other than financial asset acquired with credit deterioration | Commercial loans | Commercial and industrial | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Financial asset, other than financial asset acquired with credit deterioration | Commercial loans | Commercial and industrial | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial real estate, owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Current	299,754,000	308,824,000
Total loans	299,754,000	308,824,000
Non-accrual	0	0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial real estate, owner-occupied | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial real estate, owner-occupied | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial real estate, owner-occupied | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial real estate, investor-owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	1,001,000
Current	966,517,000	945,316,000
Total loans	966,517,000	946,317,000
Non-accrual	886,000	0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial real estate, investor-owned | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	1,001,000
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial real estate, investor-owned | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Commercial real estate, investor-owned | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Current	66,663,000	61,095,000
Total loans	66,663,000	61,095,000
Non-accrual	0	0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Construction | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Construction | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Financial asset, other than financial asset acquired with credit deterioration | Commercial real estate loans | Construction | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	493,000	544,000
Current	106,871,000	115,480,000
Total loans	107,364,000	116,024,000
Non-accrual	532,000	168,000
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Home equity | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	217,000	279,000
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Home equity | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	276,000	98,000
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Home equity | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	167,000
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Other residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Current	130,915,000	136,657,000
Total loans	130,915,000	136,657,000
Non-accrual	0	0
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Other residential | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Other residential | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Financial asset, other than financial asset acquired with credit deterioration | Residential loans | Other residential | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	0
Financial asset, other than financial asset acquired with credit deterioration | Consumer loans | Installment and other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	7,000	102,000
Current	23,798,000	27,580,000
Total loans	23,805,000	27,682,000
Non-accrual	24,000	58,000
Financial asset, other than financial asset acquired with credit deterioration | Consumer loans | Installment and other consumer | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	0	7,000
Financial asset, other than financial asset acquired with credit deterioration | Consumer loans | Installment and other consumer | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	7,000	95,000
Financial asset, other than financial asset acquired with credit deterioration | Consumer loans | Installment and other consumer | 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans past due	$ 0	$ 0

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