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Loans and Allowance for Credit Losses on Loans - Outstanding and Aging Analysis (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	$ 2,158,336,000		$ 2,158,336,000		$ 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, accrued interest, writeoff			47,000	$ 0
Commercial loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	207,488,000		207,488,000		301,602,000
Commercial real estate loans | Commercial owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	368,415,000		368,415,000		392,345,000
Commercial real estate loans | Commercial investor-owned
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	1,211,651,000		1,211,651,000		1,189,021,000
Commercial real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	112,154,000		112,154,000		119,840,000
Residential loans | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	89,244,000		89,244,000		88,746,000
Residential loans | Other residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	114,247,000		114,247,000		114,558,000
Consumer loans | Installment and other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans at amortized cost	55,137,000		55,137,000		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	2,158,336,000		2,158,336,000		2,255,645,000
Non-accrual loans	10,637,000		10,637,000		8,376,000
Non-accrual loans with no allowance	10,637,000		10,637,000		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	3,670,000		3,670,000		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	1,527,000		1,527,000		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	1,834,000		1,834,000		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	309,000		309,000		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	2,154,666,000		2,154,666,000		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	207,488,000		207,488,000		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	2,736,000		2,736,000		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	1,007,000		1,007,000		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	1,474,000		1,474,000		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	255,000		255,000		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	204,752,000		204,752,000		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	368,415,000		368,415,000		392,345,000
Non-accrual loans	9,846,000		9,846,000		7,269,000
Non-accrual loans with no allowance	9,846,000		9,846,000		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	0		0		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	0		0		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	0		0		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	368,415,000		368,415,000		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	1,211,651,000		1,211,651,000		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	1,211,651,000		1,211,651,000		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	112,154,000		112,154,000		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	112,154,000		112,154,000		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	89,244,000		89,244,000		88,746,000
Non-accrual loans	699,000		699,000		413,000
Non-accrual loans with no allowance	699,000		699,000		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	934,000		934,000		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	520,000		520,000		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	360,000		360,000		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	88,310,000		88,310,000		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	114,247,000		114,247,000		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	114,247,000		114,247,000		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	55,137,000		55,137,000		49,533,000
Non-accrual loans	92,000		92,000		0
Non-accrual loans with no allowance	92,000		92,000		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	0		0		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	0		0		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	0		0		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	$ 55,137,000		$ 55,137,000		$ 48,497,000

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