Nature of Operations and Summary of Significant Accounting Policies - Narrative (Details)		12 Months Ended
	Jan. 01, 2023 USD ($)	Dec. 31, 2023 USD ($) branch $ / shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Accounting Policies [Line Items]
Federal Home Loan Bank stock and Federal Reserve Bank stock		$ 6,300,000	$ 6,500,000
Impairment of investment in Federal Home Loan Bank stock and Federal Reserve Bank stock		0	0
Shareholders' equity		(44,383,000)	(59,583,000)	$ (67,344,000)	$ (63,219,000)
Allowance for credit loss	$ 10,310,000	15,925,000	10,310,000	9,905,000	10,584,000
Unfunded commitment reserve	8,000
Increase in deferred tax assets				(1,900,000)
Deferred tax assets, valuation allowance		0
Deferred tax assets		24,134,000	15,527,000
Unrecognized tax benefits		0	0
Transition adjustment related to adoption of ASC326, net of tax
Accounting Policies [Line Items]
Shareholders' equity	11,500,000		11,510,000
Allowance for credit loss	13,001,000		13,001,000
Unfunded commitment reserve	2,737,000
Increase in deferred tax assets	$ 4,200,000
Accumulated Deficit
Accounting Policies [Line Items]
Shareholders' equity		$ 47,026,000	31,337,000	$ 37,498,000	$ 42,592,000
Accumulated Deficit | Transition adjustment related to adoption of ASC326, net of tax
Accounting Policies [Line Items]
Shareholders' equity			11,510,000
Vesting Period One | Restricted Stock
Accounting Policies [Line Items]
Vesting period		3 years
Vesting Period Two | Restricted Stock
Accounting Policies [Line Items]
Vesting period		4 years
Vesting Period Three | Restricted Stock
Accounting Policies [Line Items]
Vesting period		5 years
Core Deposits
Accounting Policies [Line Items]
Finite-lived intangible asset, useful life		10 years
Minimum
Accounting Policies [Line Items]
Estimated useful lives		3 years
Maximum
Accounting Policies [Line Items]
Estimated useful lives		40 years
Federal Home Loan Bank Certificates and Obligations (FHLB)
Accounting Policies [Line Items]
Stock value par value (in usd per share) | $ / shares		$ 100
SBA Loan Fund
Accounting Policies [Line Items]
Debt securities		$ 4,500,000	$ 4,500,000
Connecticut
Accounting Policies [Line Items]
Number of operating branches | branch		8
New York
Accounting Policies [Line Items]
Number of operating branches | branch		1