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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 2,255,874 | $ 2,337,715
Gross Unrealized Holding Gain, Available-for-sale | 23,264 | 33,776
Gross Unrealized Holding Loss, Available-for-sale | (8,672) | (2,845)
Fair Value, Available-for-sale | $ 2,270,466 | $ 2,368,646
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 911,676 | $ 850,989
Gross Unrealized Holding Gain, Held-to-maturity | 1,138 | 4,796
Gross Unrealized Holding Loss, Held-to-maturity | (15,440) | (2,746)
Fair Value, Held-to-maturity | $ 897,374 | $ 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 | $ 345,313 | $ 380,166
Gross Unrealized Holding Gain, Available-for-sale | 3,361 | 4,689
Gross Unrealized Holding Loss, Available-for-sale | (1,485) | (1,074)
Fair Value, Available-for-sale | $ 347,189 | $ 383,781
Total Percent, Available-for-sale | 15.29% | 16.20%
Amortized Cost, Held-to-maturity | $ 244,419 | $ 1,284
Gross Unrealized Holding Gain, Held-to-maturity |  | 569
Gross Unrealized Holding Loss, Held-to-maturity | (6,808) |
Fair Value, Held-to-maturity | $ 237,611 | $ 1,853
Total Percent, Held-to-maturity | 26.81% | 0.15%
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 2,750 | $ 5,752
Gross Unrealized Holding Gain, Available-for-sale | 2 |
Gross Unrealized Holding Loss, Available-for-sale |  | (7)
Fair Value, Available-for-sale | $ 2,752 | $ 5,745
Total Percent, Available-for-sale | 0.12% | 0.24%
Amortized Cost, Held-to-maturity | $ 182,648 | $ 293,338
Gross Unrealized Holding Gain, Held-to-maturity | 362 | 1,176
Gross Unrealized Holding Loss, Held-to-maturity | (1,972) | (734)
Fair Value, Held-to-maturity | $ 181,038 | $ 293,780
Total Percent, Held-to-maturity | 20.03% | 34.47%
Residential Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,822,168 | $ 1,788,857
Gross Unrealized Holding Gain, Available-for-sale | 18,812 | 26,001
Gross Unrealized Holding Loss, Available-for-sale | (6,232) | (1,761)
Fair Value, Available-for-sale | $ 1,834,748 | $ 1,813,097
Total Percent, Available-for-sale | 80.81% | 76.55%
Amortized Cost, Held-to-maturity | $ 193,699 | $ 232,053
Gross Unrealized Holding Loss, Held-to-maturity | (1,892) | (1,293)
Fair Value, Held-to-maturity | $ 191,807 | $ 230,760
Total Percent, Held-to-maturity | 21.25% | 27.27%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 80,137 | $ 157,940
Gross Unrealized Holding Gain, Available-for-sale | 889 | 3,036
Gross Unrealized Holding Loss, Available-for-sale | (955) | (3)
Fair Value, Available-for-sale | $ 80,071 | $ 160,973
Total Percent, Available-for-sale | 3.53% | 6.80%
Amortized Cost, Held-to-maturity | $ 290,910 | $ 324,314
Gross Unrealized Holding Gain, Held-to-maturity | 776 | 3,051
Gross Unrealized Holding Loss, Held-to-maturity | (4,768) | (719)
Fair Value, Held-to-maturity | $ 286,918 | $ 326,646
Total Percent, Held-to-maturity | 31.91% | 38.11%
Other Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 5,506 | $ 5,000
Gross Unrealized Holding Gain, Available-for-sale | 200 | 50
Fair Value, Available-for-sale | $ 5,706 | $ 5,050
Total Percent, Available-for-sale | 0.25% | 0.21%

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