Loans and Allowance for Credit Losses on Loans - Loans Outstanding and Aging Analysis (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) loan	Dec. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	$ 2,083,256,000	$ 2,073,720,000
Number of loans past due more than 90 days still accruing \| loan	0	0
Financing receivable, nonaccrual, earning interest on cash basis	$ 0	$ 0
Nonaccrual interest income	0	0	$ 0
Nonaccrual interest income reversal	530,000	206,000	$ 48,000
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	2,083,256,000	2,073,720,000
Non-accrual loans	33,881,000	7,992,000
Non-accrual loans with no allowance	2,993,000	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	16,938,000	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	2,282,000	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	752,000	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	13,904,000	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	2,066,318,000	2,066,056,000
Commercial and industrial \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	152,263,000	153,750,000
Commercial and industrial \| 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	152,263,000	153,750,000
Non-accrual loans	2,845,000	4,008,000
Non-accrual loans with no allowance	0	1,311,000
Commercial and industrial \| 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	2,996,000	4,371,000
Commercial and industrial \| 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	203,000	2,991,000
Commercial and industrial \| 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	0	69,000
Commercial and industrial \| 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	2,793,000	1,311,000
Commercial and industrial \| 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	149,267,000	149,379,000
Commercial real estate loans \| Commercial owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	321,962,000	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	321,962,000	333,181,000
Non-accrual loans	1,537,000	434,000
Non-accrual loans with no allowance	1,537,000	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	880,000	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	208,000	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	559,000	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	113,000	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	321,082,000	332,414,000
Commercial real estate loans \| Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	1,273,596,000	1,219,385,000
Commercial real estate loans \| Commercial real estate, 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	1,273,596,000	1,219,385,000
Non-accrual loans	28,525,000	3,081,000
Non-accrual loans with no allowance	497,000	877,000
Commercial real estate loans \| Commercial real estate, 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	11,460,000	2,204,000
Commercial real estate loans \| Commercial real estate, 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	718,000	0
Commercial real estate loans \| Commercial real estate, 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 real estate, 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	10,742,000	0
Commercial real estate loans \| Commercial real estate, 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	1,262,136,000	1,217,181,000
Commercial real estate loans \| Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	36,970,000	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	36,970,000	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	0	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	0	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	36,970,000	99,164,000
Residential loans \| Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	88,325,000	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	88,325,000	82,087,000
Non-accrual loans	752,000	469,000
Non-accrual loans with no allowance	752,000	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	1,172,000	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	738,000	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	186,000	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	248,000	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	87,153,000	82,044,000
Residential loans \| Other residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	143,207,000	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	143,207,000	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	143,207,000	118,425,000
Installment and other consumer \| Installment and other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at amortized cost	66,933,000	67,645,000
Installment and other consumer \| 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	66,933,000	67,645,000
Non-accrual loans	222,000	0
Non-accrual loans with no allowance	207,000	0
Installment and other consumer \| 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	430,000	196,000
Installment and other consumer \| 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	415,000	195,000
Installment and other consumer \| 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	7,000	1,000
Installment and other consumer \| 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	8,000	0
Installment and other consumer \| 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	$ 66,503,000	$ 67,449,000