Loans and Allowance for Credit Losses on Loans - Outstanding and Aging Analysis (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) loan	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) loan	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	$ 2,162,632,000		$ 2,162,632,000		$ 2,255,645,000
Loans past due more than 90 days still accruing	0		0		0
Financing receivable, nonaccrual, earning interest on cash basis	0		0		0
Financing receivable, nonaccrual, interest income	0	$ 0	$ 0	$ 0
Financing receivable, number of loans placed on nonaccrual status \| loan			3
Financing receivable, nonaccrual, amortized cost	$ 397,000		$ 397,000
Financing receivable, number of loans accrued interest written off \| loan	1
Financing receivable, accrued interest, writeoff	$ 16,000		8,000
Commercial loans \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	213,122,000		213,122,000		301,602,000
Commercial loans \| Commercial and industrial \| SBA PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	17,000,000		17,000,000		111,200,000	$ 444,100,000
Commercial real estate loans \| Commercial owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	382,897,000		382,897,000		392,345,000
Commercial real estate loans \| Commercial investor-owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	1,190,419,000		1,190,419,000		1,189,021,000
Commercial real estate loans \| Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	118,147,000		118,147,000		119,840,000
Residential loans \| Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	90,629,000		90,629,000		88,746,000
Residential loans \| Other residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	113,361,000		113,361,000		114,558,000
Consumer loans \| Installment and other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	54,057,000		54,057,000		49,533,000
Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	2,162,632,000		2,162,632,000		2,255,645,000
Non-accrual loans	8,018,000		8,018,000		8,376,000
Non-accrual loans with no allowance	8,018,000		8,018,000		8,376,000
Financial asset, other than financial asset acquired with credit deterioration \| Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	3,409,000		3,409,000		2,314,000
Financial asset, other than financial asset acquired with credit deterioration \| 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	1,991,000		1,991,000		1,536,000
Financial asset, other than financial asset acquired with credit deterioration \| 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	1,162,000		1,162,000		461,000
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 at amortized cost	256,000		256,000		317,000
Financial asset, other than financial asset acquired with credit deterioration \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	2,159,223,000		2,159,223,000		2,253,331,000
Financial asset, other than financial asset acquired with credit deterioration \| Commercial loans \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	213,122,000		213,122,000		301,602,000
Non-accrual loans	0		0		0
Non-accrual loans with no allowance	0		0		0
Financial asset, other than financial asset acquired with credit deterioration \| Commercial loans \| Commercial and industrial \| Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	1,856,000		1,856,000		625,000
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 at amortized cost	1,065,000		1,065,000		2,000
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 at amortized cost	589,000		589,000		394,000
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 at amortized cost	202,000		202,000		229,000
Financial asset, other than financial asset acquired with credit deterioration \| Commercial loans \| Commercial and industrial \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	211,266,000		211,266,000		300,977,000
Financial asset, other than financial asset acquired with credit deterioration \| Commercial real estate loans \| Commercial owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	382,897,000		382,897,000		392,345,000
Non-accrual loans	7,564,000		7,564,000		7,269,000
Non-accrual loans with no allowance	7,564,000		7,564,000		7,269,000
Financial asset, other than financial asset acquired with credit deterioration \| Commercial real estate loans \| Commercial owner-occupied \| Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	1,205,000		1,205,000		0
Financial asset, other than financial asset acquired with credit deterioration \| Commercial real estate loans \| Commercial owner-occupied \| 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	660,000		660,000		0
Financial asset, other than financial asset acquired with credit deterioration \| Commercial real estate loans \| Commercial owner-occupied \| 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	545,000		545,000		0
Financial asset, other than financial asset acquired with credit deterioration \| Commercial real estate loans \| Commercial owner-occupied \| 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	0		0		0
Financial asset, other than financial asset acquired with credit deterioration \| Commercial real estate loans \| Commercial owner-occupied \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	381,692,000		381,692,000		392,345,000
Financial asset, other than financial asset acquired with credit deterioration \| Commercial real estate loans \| Commercial investor-owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	1,190,419,000		1,190,419,000		1,189,021,000
Non-accrual loans	0		0		694,000
Non-accrual loans with no allowance	0		0		694,000
Financial asset, other than financial asset acquired with credit deterioration \| Commercial real estate loans \| Commercial investor-owned \| Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	0		0		0
Financial asset, other than financial asset acquired with credit deterioration \| Commercial real estate loans \| Commercial investor-owned \| 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	0		0		0
Financial asset, other than financial asset acquired with credit deterioration \| Commercial real estate loans \| Commercial investor-owned \| 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	0		0		0
Financial asset, other than financial asset acquired with credit deterioration \| Commercial real estate loans \| Commercial investor-owned \| 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	0		0		0
Financial asset, other than financial asset acquired with credit deterioration \| Commercial real estate loans \| Commercial investor-owned \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	1,190,419,000		1,190,419,000		1,189,021,000
Financial asset, other than financial asset acquired with credit deterioration \| Commercial real estate loans \| Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	118,147,000		118,147,000		119,840,000
Non-accrual loans	0		0		0
Non-accrual loans with no allowance	0		0		0
Financial asset, other than financial asset acquired with credit deterioration \| Commercial real estate loans \| Construction \| Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	0		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 at amortized cost	0		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 at amortized cost	0		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 at amortized cost	0		0		0
Financial asset, other than financial asset acquired with credit deterioration \| Commercial real estate loans \| Construction \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	118,147,000		118,147,000		119,840,000
Financial asset, other than financial asset acquired with credit deterioration \| Residential loans \| Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	90,629,000		90,629,000		88,746,000
Non-accrual loans	454,000		454,000		413,000
Non-accrual loans with no allowance	454,000		454,000		413,000
Financial asset, other than financial asset acquired with credit deterioration \| Residential loans \| Home equity \| Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	154,000		154,000		653,000
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 at amortized cost	100,000		100,000		498,000
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 at amortized cost	0		0		67,000
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 at amortized cost	54,000		54,000		88,000
Financial asset, other than financial asset acquired with credit deterioration \| Residential loans \| Home equity \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	90,475,000		90,475,000		88,093,000
Financial asset, other than financial asset acquired with credit deterioration \| Residential loans \| Other residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	113,361,000		113,361,000		114,558,000
Non-accrual loans	0		0		0
Non-accrual loans with no allowance	0		0		0
Financial asset, other than financial asset acquired with credit deterioration \| Residential loans \| Other residential \| Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	0		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 at amortized cost	0		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 at amortized cost	0		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 at amortized cost	0		0		0
Financial asset, other than financial asset acquired with credit deterioration \| Residential loans \| Other residential \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	113,361,000		113,361,000		114,558,000
Financial asset, other than financial asset acquired with credit deterioration \| Consumer loans \| Installment and other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	54,057,000		54,057,000		49,533,000
Non-accrual loans	0		0		0
Non-accrual loans with no allowance	0		0		0
Financial asset, other than financial asset acquired with credit deterioration \| Consumer loans \| Installment and other consumer loans \| Total past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	194,000		194,000		1,036,000
Financial asset, other than financial asset acquired with credit deterioration \| Consumer loans \| Installment and other consumer loans \| 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	166,000		166,000		1,036,000
Financial asset, other than financial asset acquired with credit deterioration \| Consumer loans \| Installment and other consumer loans \| 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	28,000		28,000		0
Financial asset, other than financial asset acquired with credit deterioration \| Consumer loans \| Installment and other consumer loans \| 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	0		0		0
Financial asset, other than financial asset acquired with credit deterioration \| Consumer loans \| Installment and other consumer loans \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	$ 53,863,000		$ 53,863,000		$ 48,497,000