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Loans, net and allowance for loan losses - Loans Modified Resulting in Troubled Debt Restructurings (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2020 loan	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) loan	Dec. 31, 2020 USD ($) contract	Dec. 31, 2019 USD ($) loan contract
Loans in the formal process of foreclosure		$ 285,000	$ 135,000	$ 135,000	$ 135,000
Number of loans		0		4	4	1
Pre-Modification Recorded Investment			1,085,000
Post-Modification Recorded Investment			1,085,000
Recorded Investment			1,051,000	$ 1,051,000	$ 1,051,000
Number of defaults on loans restructured		$ 0	0			$ 0
Loan Receivable Balances Where Payment Deferrals Were Granted			330,119,000	330,119,000	330,119,000
Interest income recognized using cash-basis method on impaired loan		100,000	142,000			$ 181,000
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk		$ 1,649,000	2,818,000	$ 2,818,000	$ 2,818,000
Commercial loans
Number of business loans with payment deferrals granted | loan				479
COVID 19
Number of loans | loan				4
COVID 19 | Restaurant
Number of loans | loan		2
COVID 19 | Retail, Small Business
Number of loans | loan		2
Commercial
Number of loans | contract					1
Pre-Modification Recorded Investment			12,000
Post-Modification Recorded Investment			12,000
Recorded Investment			5,000	$ 5,000	$ 5,000
Payoff of commercial credit		$ (500,000)
Commercial | Small Business Line of Credit
Receipt		$ (400,000)
Real estate Commercial
Number of loans | contract					3	1
Pre-Modification Recorded Investment			1,073,000			$ 346,000
Post-Modification Recorded Investment			1,073,000			346,000
Recorded Investment			$ 1,046,000	$ 1,046,000	$ 1,046,000	$ 241,000
Consumer
Number of business loans with payment deferrals granted | loan	512

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- Definition

The amount of increase (decrease) in trouble debt restructured balances due to payoff.

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The amount of increase (decrease) in trouble debt restructured balances due to receipt of guaranteed portion.

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Loans made to related parties which are considered nonaccrual, past due, restructured or a potential credit risk.

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Number of financing receivables that have been modified by troubled debt restructurings.

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-Publisher FASB
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Amount, after troubled debt restructuring, of modified financing receivable.

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Amount, before troubled debt restructuring, of financing receivable to be modified.

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Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

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Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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