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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost |  | $ 888,848 | $ 772,060
Held-to-maturity, Estimated Fair Value | $ 864,173 | $ 761,660 |
Chase Capital |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 10,000 |  |
Held-to-maturity, Estimated Fair Value | $ 9,350 |  |
Credit Rating Moody’s/ S&P | Baa2/BBB- |  |
Wells Fargo Capital |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 5,000 |  |
Held-to-maturity, Estimated Fair Value | $ 4,650 |  |
Credit Rating Moody’s/ S&P | A1/BBB |  |
Huntington Capital |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 5,000 |  |
Held-to-maturity, Estimated Fair Value | $ 4,525 |  |
Credit Rating Moody’s/ S&P | Baa2/BB+ |  |
Keycorp Capital |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 5,000 |  |
Held-to-maturity, Estimated Fair Value | $ 4,600 |  |
Credit Rating Moody’s/ S&P | Baa2/BB+ |  |
PNC Capital |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 5,000 |  |
Held-to-maturity, Estimated Fair Value | $ 4,678 |  |
Credit Rating Moody’s/ S&P | Baa1/BBB- |  |
State Street Capital |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 5,000 |  |
Held-to-maturity, Estimated Fair Value | $ 4,700 |  |
Credit Rating Moody’s/ S&P | A3/BBB |  |
SunTrust Capital |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 5,000 |  |
Held-to-maturity, Estimated Fair Value | $ 4,625 |  |
Credit Rating Moody’s/ S&P | Not Rated/BB+ |  |
Southern Company |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 1,516 |  |
Held-to-maturity, Estimated Fair Value | $ 1,485 |  |
Credit Rating Moody’s/ S&P | Baa2/BBB+ |  |
AT&T Inc. |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 1,510 |  |
Held-to-maturity, Estimated Fair Value | $ 1,480 |  |
Credit Rating Moody’s/ S&P | Baa2/BBB |  |
Celgene |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 1,524 |  |
Held-to-maturity, Estimated Fair Value | $ 1,490 |  |
Credit Rating Moody’s/ S&P | Baa2/BBB+ |  |
Corporate Debt Securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 44,550 |  |
Held-to-maturity, Estimated Fair Value | $ 41,583 |  |

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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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