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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 2,165,551 | $ 2,337,715
Gross Unrealized Holding Gain, Available-for-sale | 62,113 | 33,776
Gross Unrealized Holding Loss, Available-for-sale | (113) | (2,845)
Fair Value, Available-for-sale | $ 2,227,551 | $ 2,368,646
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 878,953 | $ 850,989
Gross Unrealized Holding Gain, Held-to-maturity | 16,401 | 4,796
Gross Unrealized Holding Loss, Held-to-maturity | (1,648) | (2,746)
Fair Value, Held-to-maturity | $ 893,706 | $ 853,039
Total Percent, Held-to-maturity | 100.00% | 100.00%
CMO/REMIC - Residential [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 376,529 | $ 380,166
Gross Unrealized Holding Gain, Available-for-sale | 6,679 | 4,689
Gross Unrealized Holding Loss, Available-for-sale | (112) | (1,074)
Fair Value, Available-for-sale | $ 383,096 | $ 383,781
Total Percent, Available-for-sale | 17.20% | 16.20%
Amortized Cost, Held-to-maturity | $ 192,680 | $ 1,284
Gross Unrealized Holding Gain, Held-to-maturity | 195 | 569
Gross Unrealized Holding Loss, Held-to-maturity | (325) | 0
Fair Value, Held-to-maturity | $ 192,550 | $ 1,853
Total Percent, Held-to-maturity | 21.92% | 0.15%
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 3,750 | $ 5,752
Gross Unrealized Holding Gain, Available-for-sale | 7 | 0
Gross Unrealized Holding Loss, Available-for-sale | 0 | (7)
Fair Value, Available-for-sale | $ 3,757 | $ 5,745
Total Percent, Available-for-sale | 0.17% | 0.24%
Amortized Cost, Held-to-maturity | $ 181,840 | $ 293,338
Gross Unrealized Holding Gain, Held-to-maturity | 5,038 | 1,176
Gross Unrealized Holding Loss, Held-to-maturity | (25) | (734)
Fair Value, Held-to-maturity | $ 186,853 | $ 293,780
Total Percent, Held-to-maturity | 20.69% | 34.47%
Residential Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,684,735 | $ 1,788,857
Gross Unrealized Holding Gain, Available-for-sale | 52,941 | 26,001
Gross Unrealized Holding Loss, Available-for-sale | 0 | (1,761)
Fair Value, Available-for-sale | $ 1,737,676 | $ 1,813,097
Total Percent, Available-for-sale | 78.01% | 76.55%
Amortized Cost, Held-to-maturity | $ 204,791 | $ 232,053
Gross Unrealized Holding Gain, Held-to-maturity | 5,811 | 0
Gross Unrealized Holding Loss, Held-to-maturity | 0 | (1,293)
Fair Value, Held-to-maturity | $ 210,602 | $ 230,760
Total Percent, Held-to-maturity | 23.30% | 27.27%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 95,537 | $ 157,940
Gross Unrealized Holding Gain, Available-for-sale | 1,998 | 3,036
Gross Unrealized Holding Loss, Available-for-sale | (1) | (3)
Fair Value, Available-for-sale | $ 97,534 | $ 160,973
Total Percent, Available-for-sale | 4.38% | 6.80%
Amortized Cost, Held-to-maturity | $ 299,642 | $ 324,314
Gross Unrealized Holding Gain, Held-to-maturity | 5,357 | 3,051
Gross Unrealized Holding Loss, Held-to-maturity | (1,298) | (719)
Fair Value, Held-to-maturity | $ 303,701 | $ 326,646
Total Percent, Held-to-maturity | 34.09% | 38.11%
Other Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 5,000 | $ 5,000
Gross Unrealized Holding Gain, Available-for-sale | 488 | 50
Gross Unrealized Holding Loss, Available-for-sale | 0 | 0
Fair Value, Available-for-sale | $ 5,488 | $ 5,050
Total Percent, Available-for-sale | 0.24% | 0.21%

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