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Fair Value of Financial Instruments - Rollforward of Balance Sheet Amounts Within Level 3 Valuation Hierarchy (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |
Transfers out of Level 3 | $ 0 |
Recurring | Other assets |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |
Fair value, beginning of period | 38,156 | $ 26,422
Total realized gains included in income | (174) | 448
Changes in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at period-end | 0 | 0
Purchases | 2,361 | 1,670
Issuances | 0 | 0
Settlements | 587 | 433
Transfers out of Level 3 | 0 | 0
Fair value, end of period | 39,756 | 28,107
Total realized gains (losses) included in income related to financial assets and liabilities still on the consolidated balance sheet at period-end | (174) | 448
Recurring | Available-for-sale Securities |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |
Fair value, beginning of period | 15,903 | 14,595
Total realized gains included in income | 28 | 30
Changes in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at period-end | (21) | (496)
Purchases | 0 | 0
Issuances | 0 | 0
Settlements | 1,143 | 399
Transfers out of Level 3 | 0 | 0
Fair value, end of period | 14,767 | 13,730
Total realized gains (losses) included in income related to financial assets and liabilities still on the consolidated balance sheet at period-end | $ 28 | $ 30

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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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