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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 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 | $ 39,756 | $ 28,107 | 38,156 | $ 26,422
Total realized gains (losses) included in income | (278) | 481 | (452) | 929
Changes in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at period-end | 0 | 0 | 0 | 0
Purchases | 1,366 | 3,518 | 3,727 | 5,188
Issuances | 0 | 0 | 0 | 0
Settlements | (232) | (584) | (819) | (1,017)
Transfers out of Level 3 | 0 | 0 | 0 | 0
Fair value, end of period | 40,612 | 31,522 | 40,612 | 31,522
Total realized gains (losses) included in income related to financial assets and liabilities still on the consolidated balance sheet at period-end | (278) | 481 | (452) | 929
Recurring | Available-for-sale Securities |  |  |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |  |  |
Fair value, beginning of period | 14,767 | 13,730 | 15,903 | 14,595
Total realized gains (losses) included in income | 27 | 29 | 55 | 59
Changes in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at period-end | 501 | 1,504 | 480 | 1,008
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Settlements | 0 | 0 | (1,143) | (399)
Transfers out of Level 3 | 0 | 0 | 0 | 0
Fair value, end of period | 15,295 | 15,263 | 15,295 | 15,263
Total realized gains (losses) included in income related to financial assets and liabilities still on the consolidated balance sheet at period-end | $ 27 | $ 29 | $ 55 | $ 59

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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 issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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