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Securities - Amortized Cost, Estimated Fair Value and Credit Rating of Corporate Debt Securities (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 877,613 | $ 772,975
Estimated Fair Value | 902,418 | $ 777,290
Chase Capital |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 10,000 |
Estimated Fair Value | $ 9,205 |
Credit Rating Moody’s/ S&P | Baa1/BBB- |
Wells Fargo Capital |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 5,000 |
Estimated Fair Value | $ 4,495 |
Credit Rating Moody’s/ S&P | A1/BBB- |
Huntington Capital |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 5,000 |
Estimated Fair Value | $ 4,432 |
Credit Rating Moody’s/ S&P | Baa2/BB+ |
Keycorp Capital |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 5,000 |
Estimated Fair Value | $ 4,513 |
Credit Rating Moody’s/ S&P | Baa2/BB+ |
PNC Capital |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 5,000 |
Estimated Fair Value | $ 4,577 |
Credit Rating Moody’s/ S&P | Baa1/BBB- |
SunTrust Capital |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 5,000 |
Estimated Fair Value | $ 4,670 |
Credit Rating Moody’s/ S&P | Not Rated/BBB- |
State Street Capital |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 3,332 |
Estimated Fair Value | $ 3,007 |
Credit Rating Moody’s/ S&P | A3/BBB |
Corporate debt securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 38,332 |
Estimated Fair Value | $ 34,899 |

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- Definition Description of the credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency (for example, Standard and Poor's, Moody's, Fitch). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity). + References No definition available. + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563 + Details
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