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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Securities Financing Transaction [Line Items] |  |  |
Held-to-maturity, Amortized Cost |  | $ 888,848 | $ 772,060
Held-to-maturity, Estimated Fair Value | $ 864,173 | 761,660 |
Total, Amortized Cost | 990,451 | 854,438 |
Total, Gross Unrealized Gains | 1,897 | 1,967 |
Total, Gross Unrealized Losses | (28,160) | (13,164) |
Total, Estimated Fair Value | 964,188 | 843,241 |
Held-to-Maturity Securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Held-to-maturity, Amortized Cost | 888,848 | 772,060 |
Held-to-maturity, Gross Unrealized Gains | 1,897 | 1,967 |
Held-to-maturity, Gross Unrealized Losses | (26,572) | (12,367) |
Held-to-maturity, Estimated Fair Value | 864,173 | 761,660 |
Held-to-Maturity Securities | Debt Securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Held-to-maturity, Amortized Cost | 214,781 | 240,950 |
Held-to-maturity, Gross Unrealized Gains | 921 | 531 |
Held-to-maturity, Gross Unrealized Losses | (6,112) | (5,502) |
Held-to-maturity, Estimated Fair Value | 209,590 | 235,979 |
Debt Securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Held-to-maturity, Amortized Cost | 101,603 |  |
Held-to-maturity, Gross Unrealized Gains | 0 |  |
Held-to-maturity, Gross Unrealized Losses | (1,588) |  |
Held-to-maturity, Estimated Fair Value | 100,015 |  |
U.S. Agency Obligations | Held-to-Maturity Securities | Debt Securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Held-to-maturity, Amortized Cost | 14,974 | 14,968 |
Held-to-maturity, Gross Unrealized Gains | 0 | 0 |
Held-to-maturity, Gross Unrealized Losses | (192) | (65) |
Held-to-maturity, Estimated Fair Value | 14,782 | 14,903 |
U.S. Agency Obligations | Debt Securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Held-to-maturity, Amortized Cost | 100,450 | 82,378 |
Held-to-maturity, Gross Unrealized Gains | 0 | 0 |
Held-to-maturity, Gross Unrealized Losses | (1,577) | (797) |
Held-to-maturity, Estimated Fair Value | 98,873 | 81,581 |
Mortgage-Backed Securities | Held-to-Maturity Securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Held-to-maturity, Amortized Cost | 674,067 | 531,110 |
Held-to-maturity, Gross Unrealized Gains | 976 | 1,436 |
Held-to-maturity, Gross Unrealized Losses | (20,460) | (6,865) |
Held-to-maturity, Estimated Fair Value | 654,583 | 525,681 |
Mortgage-Backed Securities | Held-to-Maturity Securities | FHLMC |  |  |
Securities Financing Transaction [Line Items] |  |  |
Held-to-maturity, Amortized Cost | 249,884 | 186,921 |
Held-to-maturity, Gross Unrealized Gains | 45 | 151 |
Held-to-maturity, Gross Unrealized Losses | (8,126) | (2,937) |
Held-to-maturity, Estimated Fair Value | 241,803 | 184,135 |
Mortgage-Backed Securities | Held-to-Maturity Securities | FNMA |  |  |
Securities Financing Transaction [Line Items] |  |  |
Held-to-maturity, Amortized Cost | 289,210 | 263,103 |
Held-to-maturity, Gross Unrealized Gains | 755 | 1,193 |
Held-to-maturity, Gross Unrealized Losses | (9,382) | (3,000) |
Held-to-maturity, Estimated Fair Value | 280,583 | 261,296 |
Mortgage-Backed Securities | Held-to-Maturity Securities | GNMA |  |  |
Securities Financing Transaction [Line Items] |  |  |
Held-to-maturity, Amortized Cost | 130,847 | 75,243 |
Held-to-maturity, Gross Unrealized Gains | 176 | 64 |
Held-to-maturity, Gross Unrealized Losses | (2,858) | (928) |
Held-to-maturity, Estimated Fair Value | 128,165 | 74,379 |
Mortgage-Backed Securities | Held-to-Maturity Securities | SBA |  |  |
Securities Financing Transaction [Line Items] |  |  |
Held-to-maturity, Amortized Cost | 4,126 | 5,843 |
Held-to-maturity, Gross Unrealized Gains | 0 | 28 |
Held-to-maturity, Gross Unrealized Losses | (94) | 0 |
Held-to-maturity, Estimated Fair Value | 4,032 | 5,871 |
Mortgage-Backed Securities | Debt Securities | FNMA |  |  |
Securities Financing Transaction [Line Items] |  |  |
Held-to-maturity, Amortized Cost | 1,153 |  |
Held-to-maturity, Gross Unrealized Gains | 0 |  |
Held-to-maturity, Gross Unrealized Losses | (11) |  |
Held-to-maturity, Estimated Fair Value | 1,142 |  |
State and Municipal Obligations | Held-to-Maturity Securities | Debt Securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Held-to-maturity, Amortized Cost | 134,988 | 149,958 |
Held-to-maturity, Gross Unrealized Gains | 0 | 219 |
Held-to-maturity, Gross Unrealized Losses | (2,885) | (1,475) |
Held-to-maturity, Estimated Fair Value | 132,103 | 148,702 |
Corporate Debt Securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Held-to-maturity, Amortized Cost | 44,550 |  |
Held-to-maturity, Estimated Fair Value | 41,583 |  |
Corporate Debt Securities | Held-to-Maturity Securities | Debt Securities |  |  |
Securities Financing Transaction [Line Items] |  |  |
Held-to-maturity, Amortized Cost | 64,819 | 76,024 |
Held-to-maturity, Gross Unrealized Gains | 921 | 312 |
Held-to-maturity, Gross Unrealized Losses | (3,035) | (3,962) |
Held-to-maturity, Estimated Fair Value | $ 62,705 | $ 72,374 |

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