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Securities - Amortized Cost, Estimated Fair Value and Credit Rating of Corporate Debt Securities (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 823,717 | $ 851,903
Estimated Fair Value | 826,964 | $ 832,815
Chase Capital |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 10,000 |
Estimated Fair Value | $ 9,200 |
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 | $ 4,625 |
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 | $ 4,450 |
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 | $ 4,525 |
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 | $ 4,600 |
Credit Rating Moody’s/ S&P | Baa1/BBB- |
State Street Capital |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 5,000 |
Estimated Fair Value | $ 4,613 |
Credit Rating Moody’s/ S&P | A3/BBB |
SunTrust Capital |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 5,000 |
Estimated Fair Value | $ 4,625 |
Credit Rating Moody’s/ S&P | Not Rated/BB+ |
Celgene |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 1,511 |
Estimated Fair Value | $ 1,508 |
Credit Rating Moody’s/ S&P | Baa2/BBB+ |
Southern Company |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 1,507 |
Estimated Fair Value | $ 1,505 |
Credit Rating Moody’s/ S&P | Baa2/BBB+ |
BB&T |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 1,506 |
Estimated Fair Value | $ 1,505 |
Credit Rating Moody’s/ S&P | A2/A- |
AT&T Inc. |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 1,505 |
Estimated Fair Value | $ 1,504 |
Credit Rating Moody’s/ S&P | Baa2/BBB |
Corporate debt securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 46,029 |
Estimated Fair Value | $ 42,660 |

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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=6877327&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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