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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
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 | $ 28,107 | $ 29,788 | 26,422 | $ 28,874
Total realized gains included in income | 481 | 2,265 | 929 | 2,777
Changes in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at period-end | 0 | 0 | 0 | 0
Purchases | 3,518 | 3,948 | 5,188 | 4,818
Issuances | 0 | 0 | 0 | 0
Settlements | 584 | 257 | 1,017 | 725
Transfers out of Level 3 | 0 | (12,166) | 0 | (12,166)
Fair value, end of period | 31,522 | 23,578 | 31,522 | 23,578
Total realized gains included in income related to financial assets and liabilities still on the consolidated balance sheet at period-end | 481 | 2,265 | 929 | 2,777
Recurring | Available-for-sale Securities |  |  |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |  |  |
Fair value, beginning of period | 13,730 | 15,226 | 14,595 | 17,029
Total realized gains included in income | 29 | 30 | 59 | 60
Changes in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at period-end | 1,504 | 34 | 1,008 | (631)
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Settlements | 0 | 0 | (399) | (1,168)
Transfers out of Level 3 | 0 | 0 | 0 | 0
Fair value, end of period | 15,263 | 15,290 | 15,263 | 15,290
Total realized gains included in income related to financial assets and liabilities still on the consolidated balance sheet at period-end | $ 29 | $ 30 | $ 59 | $ 60

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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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