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Allowance for credit losses - Financial effect of the modifications made to borrowers experiencing financial difficultie (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Interest Rate Reduction | Mortgages
Allowance for credit loss
Reduced weighted average contractual interest rate before modification	6.90%	5.90%	6.80%	6.10%
Reduced weighted average contractual interest rate after modification	5.40%	4.30%	5.50%	4.40%
Interest Rate Reduction | Commercial | CRE non-owner occupied
Allowance for credit loss
Reduced weighted average contractual interest rate before modification				10.10%
Reduced weighted average contractual interest rate after modification				8.30%
Interest Rate Reduction | Commercial | CRE owner occupied
Allowance for credit loss
Reduced weighted average contractual interest rate before modification	10.00%	10.50%	10.00%	10.60%
Reduced weighted average contractual interest rate after modification	7.50%	6.60%	7.50%	6.50%
Interest Rate Reduction | Commercial | Commercial and industrial
Allowance for credit loss
Reduced weighted average contractual interest rate before modification	14.40%	25.80%	18.60%	20.60%
Reduced weighted average contractual interest rate after modification	8.00%	10.20%	8.70%	9.60%
Interest Rate Reduction | Consumer | Credit card
Allowance for credit loss
Reduced weighted average contractual interest rate before modification	20.60%	21.50%	20.90%	20.90%
Reduced weighted average contractual interest rate after modification	8.50%	8.00%	8.40%	6.50%
Interest Rate Reduction | Consumer | Personal loans
Allowance for credit loss
Reduced weighted average contractual interest rate before modification	20.10%	19.50%	21.10%	19.10%
Reduced weighted average contractual interest rate after modification	11.60%	10.40%	11.70%	10.00%
Interest Rate Reduction | Consumer | Auto Loan
Allowance for credit loss
Reduced weighted average contractual interest rate before modification	8.20%		11.86%
Reduced weighted average contractual interest rate after modification	8.19%		11.85%
Interest Rate Reduction | Consumer | Other
Allowance for credit loss
Reduced weighted average contractual interest rate before modification			18.00%	18.00%
Reduced weighted average contractual interest rate after modification			0.00%	0.00%
Term extension | Construction
Allowance for credit loss
Weighted average life of loans		2 months		2 months
Term extension | Mortgages
Allowance for credit loss
Weighted average life of loans	12 years	12 years	13 years	12 years
Term extension | Commercial | Commercial multi-family
Allowance for credit loss
Weighted average life of loans		4 months		4 months
Term extension | Commercial | CRE non-owner occupied
Allowance for credit loss
Weighted average life of loans	5 months	7 months	2 years	9 months
Term extension | Commercial | CRE owner occupied
Allowance for credit loss
Weighted average life of loans	3 years	5 years	3 years	11 months
Term extension | Commercial | Commercial and industrial
Allowance for credit loss
Weighted average life of loans	7 years	1 year	5 years	2 years
Term extension | Consumer | Personal loans
Allowance for credit loss
Weighted average life of loans	6 years	5 years	5 years	8 years
Term extension | Consumer | Auto Loan
Allowance for credit loss
Weighted average life of loans	21 months		2 years	4 years
Other-Than-Insignificant Payment Delays | Mortgages
Allowance for credit loss
Weighted average life of loans	22 months		21 months	30 months
Other-Than-Insignificant Payment Delays | Commercial | CRE non-owner occupied
Allowance for credit loss
Weighted average life of loans		14 months		14 months
Other-Than-Insignificant Payment Delays | Commercial | CRE owner occupied
Allowance for credit loss
Weighted average life of loans	9 months	7 months	11 months	10 months
Other-Than-Insignificant Payment Delays | Commercial | Commercial and industrial
Allowance for credit loss
Weighted average life of loans	14 months	7 months	12 months	7 months
Other-Than-Insignificant Payment Delays | Consumer | Credit card
Allowance for credit loss
Weighted average life of loans	18 months	16 months	17 months	18 months

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