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Fair Value of Financial Instruments - Rollforward of Balance Sheet Amounts Within Level 3 Valuation Hierarchy (Details) - Recurring - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Other assets |  |  |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |  |  |
Fair value, beginning of period | $ 29,788 | $ 10,492 | $ 28,874 | $ 10,478
Total realized gains included in income | 2,265 | 240 | 2,777 | 437
Changes in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at June 30 | 0 | 0 | 0 | 0
Acquired | 0 | 17,062 | 0 | 17,062
Purchases | 3,948 | 649 | 4,818 | 769
Issuances | 0 | 0 | 0 | 0
Settlements | (257) | (593) | (725) | (896)
Transfers out of Level 3 | (12,166) | 0 | (12,166) | 0
Fair value, end of period | 23,578 | 27,850 | 23,578 | 27,850
Total realized gains included in income related to financial assets and liabilities still on the consolidated balance sheet at June 30 | 2,265 | 240 | 2,777 | 437
Available-for-sale Securities |  |  |  |
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward] |  |  |  |
Fair value, beginning of period | 15,226 | 0 | 17,029 | 0
Total realized gains included in income | 30 | 0 | 60 | 0
Changes in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at June 30 | 34 | 0 | (631) | 0
Acquired | 0 | 0 | 0 | 0
Purchases | 0 | 0 | 0 | 0
Issuances | 0 | 0 | 0 | 0
Settlements | 0 | 0 | (1,168) | 0
Transfers out of Level 3 | 0 | 0 |  | 0
Fair value, end of period | 15,290 | 0 | 15,290 | 0
Total realized gains included in income related to financial assets and liabilities still on the consolidated balance sheet at June 30 | $ 30 | $ 0 | $ 60 | $ 0

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Acquisitions + References No definition available. + Details
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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 the income statement for 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)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for 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)(1a) -URI http://asc.fasb.org/extlink&oid=99377789&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=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of purchases 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=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + 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)(3) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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