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Investment securities - Pledged Securities (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Available-for-sale and Held-to-maturity securities |  |
Carrying value of securities pledged | us-gaap:AssetPledgedAsCollateralMember | us-gaap:AssetPledgedAsCollateralMember
Collateral Pledged |  |
Available-for-sale and Held-to-maturity securities |  |
Carrying value of securities pledged | $ 168.0 | $ 203.6
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Maximum percentage of stockholders' equity exceeded for securities of any individual issuer | 10.00% | 10.00%

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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI https://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=127002003&loc=SL6242269-115581 + Details
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- Definition Indicates type of restriction on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Details
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- Details
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