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Fair Value Measurements - Reconciliation of activity for assets and liabilities measured at fair value (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Assets: |  |
Beginning balance | $ 6,713 | $ 11,211
Realized gain (loss) included in earnings | (2,699) | 4,933
Migrated to level 2 valuation |  | (9,233)
Reclass fair value asset to cost method |  | (198)
Ending balance | 4,014 | 6,713
Liabilities: |  |
Beginning balance | 0 | 66
Realized gain included in earnings |  | (66)
Ending balance | 0 | 0
Investment Securities |  |
Assets: |  |
Beginning balance | 1,500 | 10,931
Realized gain (loss) included in earnings | 0 | 0
Migrated to level 2 valuation |  | (9,233)
Reclass fair value asset to cost method |  | (198)
Ending balance | 1,500 | 1,500
Liabilities: |  |
Beginning balance | 0 | 0
Realized gain included in earnings |  | 0
Ending balance | 0 | 0
Mortgage Balancing Derivatives |  |
Assets: |  |
Beginning balance | 5,213 | 280
Realized gain (loss) included in earnings | (2,699) | 4,933
Ending balance | 2,514 | 5,213
Liabilities: |  |
Beginning balance | 0 | 66
Realized gain included in earnings |  | (66)
Ending balance | $ 0 | $ 0

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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