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Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity - Securities Available-for-sale (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available-for-sale, Amortized Cost |  |
Due 3 months or less | $ 14,988 |
Due after 3 months through one year | 44,809 |
Agency mortgage-backed securities | 170,215 |
Total | 230,012 | $ 402,537
Available-for-sale, Estimated Fair Value |  |
Due 3 months or less | 15,039 |
Due after 3 months through one year | 45,409 |
Agency mortgage-backed securities | 175,326 |
Total | $ 235,774 | $ 404,825

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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing after 3 months through one year following the latest balance sheet. + References No definition available. + Details
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- Definition Fair value of available-for-sale debt securities maturing after 3 months through one year following the latest balance sheet. + References No definition available. + Details
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- Definition Amortized cost of 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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