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Investment securities - Pledged Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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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 | $ 165,982 | $ 157,047
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 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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Period Type: | instant

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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 http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Period Type: |

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- Details
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