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Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investment Securities [Line Items] |  |  |
Due within 1 year, Amortized Cost |  | $ 0 |
Due after 1 but within 5 years, Amortized Cost |  | 35,886 |
Due after 5 but within 10 years, Amortized Cost |  | 5,771 |
Due after 10 years, Amortized Cost |  | 0 |
Debt securities gross, Amortized Cost |  | 41,657 |
Amortized Cost |  | 896,495 | $ 924,054
Total debt securities, Amortized Cost |  | 896,495 |
Due within 1 year, Estimated Fair Value |  | 0 |
Due after 1 but within 5 years, Estimated Fair Value |  | 36,554 |
Due after 5 but within 10 years, Estimated Fair Value |  | 6,317 |
Due after 10 years, Estimated Fair Value |  | 0 |
Debt securities gross, Estimated Fair Value |  | 42,871 |
Securities available for sale |  | 902,292 | $ 909,247
Total debt securities, Estimated Fair Value |  | 902,292 |
Mortgage-Backed Securities [Member] |  |  |
Investment Securities [Line Items] |  |  |
Amortized Cost | [1] | 854,838 |
Securities available for sale | [1] | $ 859,421 |
[1] | Mortgage Backed Securities include an amortized cost of $194.1 million and a fair value of $197.5 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $660.8 million and a fair value of $661.9 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.

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