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Note 14 - Commitments and Off-balance-sheet Risk - Instruments Carried at Fair Values (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
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Standby letters of credit, carrying value | $ 1,038,444,000 | $ 1,036,775,000
Standby Letters of Credit [Member] |  |
Standby letters of credit, contract amount | 22,798,000 | 25,322,000
Standby letters of credit, carrying value | $ 160,000 | $ 126,000

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- Definition The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |