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Securities - Schedule of Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Amortized Cost And Fair Value Debt Securities [Abstract] |  |
Total available-for-sale debt securities, Amortized Cost, Less than one year | $ 61,932 |
Total available-for-sale debt securities, Amortized Cost, 1-5 years | 116,281 |
Total available-for-sale debt securities, Amortized Cost, 5-10 years | 407,897 |
Total available-for-sale debt securities, Amortized Cost, Over 10 years | 1,591,068 |
Available-for-sale, Amortized Cost | 2,177,178 | $ 2,142,056
Total held-to-maturity debt securities, Amortized Cost, Less than one year | 18,138 |
Total held-to-maturity debt securities, Amortized Cost, 1-5 years | 127,140 |
Total held-to-maturity debt securities, Amortized Cost, 5-10 years | 328,315 |
Total held-to-maturity debt securities, Amortized Cost, Over 10 years | 379,231 |
Held-to-maturity, Amortized Cost | 852,824 | 1,020,934
Total debt securities, Amortized Cost | 3,030,002 |
Total available-for-sale debt securities, Fair Value, Less than one year | 61,992 |
Total available-for-sale debt securities, Fair Value, 1-5 years | 117,740 |
Total available-for-sale debt securities, Fair Value, 5-10 years | 416,454 |
Total available-for-sale debt securities, Fair Value, Over 10 years | 1,613,013 |
Total available-for-sale debt securities, Fair Value | 2,209,199 | 2,114,129
Total held-to-maturity debt securities, Fair Value, Less than one year | 18,201 |
Total held-to-maturity debt securities, Fair Value, 1-5 years | 130,634 |
Total held-to-maturity debt securities, Fair Value, 5-10 years | 338,075 |
Total held-to-maturity debt securities, Fair Value, Over 10 years | 390,899 |
Total held-to-maturity debt securities, Fair Value | 877,809 | 1,020,743
Total debt securities, Fair Value | $ 3,087,008 | $ 3,134,872

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year through fifth year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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