Loans and Allowance for Credit Losses on Loans - Schedule of Loans Outstanding and Aging Analysis (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) loan	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	$ 2,054,963,000		$ 2,073,720,000
Number of loans 90 days past due and still accruing \| loan			0
Financing receivable, nonaccrual, earning interest on cash basis	0		$ 0
Nonaccrual interest income reversal	10,000	$ 16,000
Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	2,054,963,000		2,073,720,000
Non-accrual loans	6,295,000		7,992,000
Non-accrual loans with no allowance	1,902,000		3,091,000
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	13,257,000		7,664,000
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	2,406,000		3,930,000
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	390,000		2,274,000
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	10,461,000		1,460,000
Current \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	2,041,706,000		2,066,056,000
Commercial loans \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	150,896,000		153,750,000
Commercial loans \| 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	150,896,000		153,750,000
Non-accrual loans	2,220,000		4,008,000
Non-accrual loans with no allowance	0		1,311,000
Commercial loans \| 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	432,000		4,371,000
Commercial loans \| 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	13,000		2,991,000
Commercial loans \| 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	390,000		69,000
Commercial loans \| 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	29,000		1,311,000
Commercial loans \| 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	150,464,000		149,379,000
Commercial real estate loans \| Commercial owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	328,560,000		333,181,000
Commercial real estate loans \| Commercial owner-occupied \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	328,560,000		333,181,000
Non-accrual loans	416,000		434,000
Non-accrual loans with no allowance	416,000		434,000
Commercial real estate loans \| Commercial 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	241,000		767,000
Commercial real estate loans \| Commercial 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	101,000		618,000
Commercial real estate loans \| Commercial 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 loans \| Commercial 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	140,000		149,000
Commercial real estate loans \| Commercial 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	328,319,000		332,414,000
Commercial real estate loans \| Commercial non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	1,236,633,000		1,219,385,000
Commercial real estate loans \| Commercial non-owner occupied \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	1,236,633,000		1,219,385,000
Non-accrual loans	3,045,000		3,081,000
Non-accrual loans with no allowance	872,000		877,000
Commercial real estate loans \| Commercial non-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	11,164,000		2,204,000
Commercial real estate loans \| Commercial non-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	872,000		0
Commercial real estate loans \| Commercial non-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		2,204,000
Commercial real estate loans \| Commercial non-owner occupied \| 90 days or more past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans 90 days past due and still accruing \| loan	1
Commercial real estate loans \| Commercial non-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	$ 10,292,000		0
Commercial real estate loans \| Commercial non-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	1,225,469,000		1,217,181,000
Commercial real estate loans \| Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	71,494,000		99,164,000
Commercial real estate loans \| Construction \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	71,494,000		99,164,000
Non-accrual loans	0		0
Non-accrual loans with no allowance	0		0
Commercial real estate loans \| 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	1,057,000		0
Commercial real estate loans \| 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	1,057,000		0
Commercial real estate loans \| 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 loans \| 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 loans \| Construction \| Current \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	70,437,000		99,164,000
Residential loans \| Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	86,794,000		82,087,000
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	86,794,000		82,087,000
Non-accrual loans	473,000		469,000
Non-accrual loans with no allowance	473,000		469,000
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	360,000		43,000
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	360,000		43,000
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	0		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	0		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	86,434,000		82,044,000
Residential loans \| Other residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	113,479,000		118,508,000
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	113,479,000		118,508,000
Non-accrual loans	0		0
Non-accrual loans with no allowance	0		0
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		83,000
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		83,000
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	113,479,000		118,425,000
Consumer loans \| Installment and other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	67,107,000		67,645,000
Consumer loans \| Installment and other consumer loans \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	67,107,000		67,645,000
Non-accrual loans	141,000		0
Non-accrual loans with no allowance	141,000		0
Consumer loans \| Installment and other consumer loans \| 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	3,000		196,000
Consumer loans \| Installment and other consumer loans \| 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	3,000		195,000
Consumer loans \| Installment and other consumer loans \| 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		1,000
Consumer loans \| Installment and other consumer loans \| 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 loans \| Current \| Financial asset, other than financial asset acquired with credit deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	$ 67,104,000		$ 67,449,000