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Summary of significant accounting policies - Significant events (Details)		3 Months Ended						9 Months Ended		12 Months Ended
	Oct. 29, 2021 $ / shares	Sep. 30, 2021 USD ($) loan $ / shares	Jun. 30, 2021 $ / shares	Mar. 31, 2021 $ / shares	Sep. 30, 2020 USD ($) $ / shares	Jun. 30, 2020 $ / shares	Mar. 31, 2020 $ / shares	Sep. 30, 2021 USD ($) loan $ / shares	Sep. 30, 2020 USD ($) $ / shares	Dec. 31, 2020 USD ($) loan
Interest and Fee Income, Loans and Leases, Total		$ 21,276,000			$ 20,901,000			$ 62,205,000	$ 62,978,000
Loans		$ 2,205,661,000						$ 2,205,661,000		$ 2,177,982,000
Dividends declared | $ / shares	$ 0.38	$ 0.38	$ 0.37	$ 0.37	$ 0.36	$ 0.36	$ 0.36	$ 1.12	$ 1.08
Period for net fees recognized into income								6 months
PPP
Loans		$ 83,521,000						$ 83,521,000		$ 189,699,000
Remaining unamortized fees		$ 2,300,000						$ 2,300,000
PPP | SBA PPP
Number of loans originated | loan		1,062						1,062		1,450
Principal amount of loan originated		$ 121,600,000						$ 121,600,000		$ 217,500,000
Average loan size										150,000
Net fees on loans										5,200,000
Fees income								4,300,000
Amount of loan forgiven		227,800,000						227,800,000		27,800,000
Interest and Fee Income, Loans and Leases, Total								4,900,000		$ 2,300,000
PPP | Minimum | SBA PPP
Amortization period										24 months
PPP | Maximum | SBA PPP
Amortization period										60 months
PPP Two
Loans		$ 69,284,000						$ 69,284,000
Commercial loans | SBA PPP
Number of business loans with payment deferrals granted | loan										479
Loan receivable balances where payment deferrals were granted										$ 306,800,000
Consumer Loan | SBA PPP
Number of business loans with payment deferrals granted | loan										512
Loan receivable balances where payment deferrals were granted										$ 23,300,000

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases under paycheck protection program.

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