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Regulatory capital requirements - Additional Information (Details) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Regulatory Capital Requirements under Banking Regulations |  |
Loans held-in-portfolio | $ 35,420,879,000 | $ 32,372,925,000
PPPL | Asset pledged as collateral |  |
Regulatory Capital Requirements under Banking Regulations |  |
Loans held-in-portfolio | 0 |
SBA loans under PPP program |  |
Regulatory Capital Requirements under Banking Regulations |  |
Loans held-in-portfolio | $ 9,200,000 | $ 38,000,000
Standardized approach | Basel III |  |
Regulatory Capital Requirements under Banking Regulations |  |
CET 1 minimum ratio required ratio | 0.065 |
Tier one risk based capital required for capital adequacy ratio | 0.08 |
Capital required for capital adequacy ratio | 0.10 |
Leverage ratio required | 0.05 |

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- Definition The Tier 1 common equity capital ratio (Tier 1 common equity divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition Ratio of minimum total risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481990/310-10-45-2 + Details
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- Definition Ratio of minimum Tier 1 leverage capital to average assets categorized as well capitalized as defined by regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480696/942-505-50-1 + Details
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