Loans and Allowance for Credit Losses - Loans Outstanding and Aging Analysis (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	$ 2,255,645,000	$ 2,088,556,000
Non-accrual loans	8,376,000	9,233,000
Non-accrual loans with no allowance	8,376,000	9,233,000
Loans past due more than 90 days still accruing		0
Nonaccrual loans earning interest on cash basis	0	0
Nonaccrual interest income	0	0	$ 0
Accrued interest writeoff	0	36,000
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	2,255,645,000	2,088,556,000
Total past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	2,314,000	2,705,000
30-59 days past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	1,536,000	2,083,000
60-89 days past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	461,000	622,000
90 days or more past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	317,000	0
Current \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	2,253,331,000	2,085,851,000
Commercial \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	301,602,000	498,408,000
Non-accrual loans	0	0
Non-accrual loans with no allowance	0	0
Commercial \| Commercial and industrial \| Small Business Administration Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	$ 111,200,000	291,600,000		$ 444,100,000
Number of loans past due more than 90 days still accruing \| loan	2
Loans past due more than 90 days still accruing	$ 229,000
Commercial \| Commercial and industrial \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	301,602,000	498,408,000
Commercial \| Commercial and industrial \| Total past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	625,000	0
Commercial \| Commercial and industrial \| 30-59 days past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	2,000	0
Commercial \| Commercial and industrial \| 60-89 days past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	394,000	0
Commercial \| Commercial and industrial \| 90 days or more past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	229,000	0
Commercial \| Commercial and industrial \| Current \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	300,977,000	498,408,000
Commercial real estate \| Commercial real estate, owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	392,345,000	304,963,000
Non-accrual loans	7,269,000	7,147,000
Non-accrual loans with no allowance	7,269,000	7,147,000
Commercial real estate \| Commercial real estate, owner-occupied \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	392,345,000	304,963,000
Commercial real estate \| Commercial real estate, owner-occupied \| Total past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	0
Commercial real estate \| Commercial real estate, owner-occupied \| 30-59 days past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	0
Commercial real estate \| Commercial real estate, owner-occupied \| 60-89 days past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	0
Commercial real estate \| Commercial real estate, owner-occupied \| 90 days or more past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	0
Commercial real estate \| Commercial real estate, owner-occupied \| Current \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	392,345,000	304,963,000
Commercial real estate \| Commercial real estate, investor-owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	1,189,021,000	961,208,000
Non-accrual loans	694,000	1,610,000
Non-accrual loans with no allowance	694,000	1,610,000
Commercial real estate \| Commercial real estate, investor-owned \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	1,189,021,000	961,208,000
Commercial real estate \| Commercial real estate, investor-owned \| Total past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	1,673,000
Commercial real estate \| Commercial real estate, investor-owned \| 30-59 days past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	1,673,000
Commercial real estate \| Commercial real estate, investor-owned \| 60-89 days past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	0
Commercial real estate \| Commercial real estate, investor-owned \| 90 days or more past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	0
Commercial real estate \| Commercial real estate, investor-owned \| Current \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	1,189,021,000	959,535,000
Commercial real estate \| Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	119,840,000	73,046,000
Non-accrual loans	0	0
Non-accrual loans with no allowance	0	0
Commercial real estate \| Construction \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	119,840,000	73,046,000
Commercial real estate \| Construction \| Total past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	0
Commercial real estate \| Construction \| 30-59 days past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	0
Commercial real estate \| Construction \| 60-89 days past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	0
Commercial real estate \| Construction \| 90 days or more past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	0
Commercial real estate \| Construction \| Current \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	119,840,000	73,046,000
Residential loans \| Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	88,746,000	104,813,000
Non-accrual loans	413,000	459,000
Non-accrual loans with no allowance	413,000	459,000
Residential loans \| Home equity \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	88,746,000	104,813,000
Residential loans \| Home equity \| Total past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	653,000	274,000
Residential loans \| Home equity \| 30-59 days past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	498,000	274,000
Residential loans \| Home equity \| 60-89 days past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	67,000	0
Residential loans \| Home equity \| 90 days or more past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	88,000	0
Residential loans \| Home equity \| Current \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	88,093,000	104,539,000
Residential loans \| Other residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	114,558,000	123,395,000
Non-accrual loans	0	0
Non-accrual loans with no allowance	0	0
Residential loans \| Other residential \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	114,558,000	123,395,000
Residential loans \| Other residential \| Total past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	0
Residential loans \| Other residential \| 30-59 days past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	0
Residential loans \| Other residential \| 60-89 days past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	0
Residential loans \| Other residential \| 90 days or more past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	0
Residential loans \| Other residential \| Current \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	114,558,000	123,395,000
Consumer loans \| Installment and other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	49,533,000	22,723,000
Non-accrual loans	0	17,000
Non-accrual loans with no allowance	0	17,000
Consumer loans \| Installment and other consumer \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	49,533,000	22,723,000
Consumer loans \| Installment and other consumer \| Total past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	1,036,000	758,000
Consumer loans \| Installment and other consumer \| 30-59 days past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	1,036,000	136,000
Consumer loans \| Installment and other consumer \| 60-89 days past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	622,000
Consumer loans \| Installment and other consumer \| 90 days or more past due \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	0	0
Consumer loans \| Installment and other consumer \| Current \| Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	$ 48,497,000	$ 21,965,000