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Acquisitions and Intangible Assets - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) acquisition	Dec. 31, 2021 USD ($) acquisition	Dec. 31, 2020 USD ($)	Dec. 11, 2020 USD ($)
Business Acquisition [Line Items]
Number of acquisitions | acquisition	0	0
Operating lease asset	$ 737	$ 822	$ 511
Net lease liability	737	822	511	$ 511
Acquisition-related costs	0	0	310
Amortization of identified intangibles	$ 69	69	43
Belfast, Maine Branch
Business Acquisition [Line Items]
Deposits				19,261
Loans & accrued interest				23,138
Operating lease asset				$ 511
Acquisition-related costs			310
Belfast, Maine Branch | Core Deposits
Business Acquisition [Line Items]
Intangible assets useful life	10 years
Amortization of identified intangibles	$ 26
Yearly amortization expense until fully amortized		26
Bank Acquisitions From Camden National Bank | Core Deposits
Business Acquisition [Line Items]
Intangible assets useful life	10 years
Amortization of identified intangibles	$ 43	$ 43	$ 43

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- Definition

Amortization of Intangible Assets, Yearly Expense till Fully Amortized

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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The amount of financial liabilities assumed (as defined) which have been recognized as of the acquisition date.

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The number of businesses acquired by the entity during the period.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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