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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Amortized Cost, Available-for-sale | $ 2,337,715 | $ 3,083,582
Gross Unrealized Holding Gain, Available-for-sale | 33,776 | 65,754
Gross Unrealized Holding Loss, Available-for-sale | (2,845) | (12,178)
Fair Value, Available-for-sale | $ 2,368,646 | $ 3,137,158
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 850,989 | $ 1,528
Gross Unrealized Holding Gain, Held-to-maturity | 4,796 | 649
Gross Unrealized Holding Loss, Held-to-maturity | (2,746) | 0
Fair Value, Held-to-maturity | $ 853,039 | $ 2,177
Total Percent, Held-to-maturity | 100.00% | 100.00%
CMO's/REMIC's - Residential [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Amortized Cost, Available-for-sale | $ 380,166 | $ 297,318
Gross Unrealized Holding Gain, Available-for-sale | 4,689 | 7,050
Gross Unrealized Holding Loss, Available-for-sale | (1,074) | (277)
Fair Value, Available-for-sale | $ 383,781 | $ 304,091
Total Percent, Available-for-sale | 16.20% | 9.69%
Amortized Cost, Held-to-maturity | $ 1,284 | $ 1,528
Gross Unrealized Holding Gain, Held-to-maturity | 569 | 649
Gross Unrealized Holding Loss, Held-to-maturity | 0 | 0
Fair Value, Held-to-maturity | $ 1,853 | $ 2,177
Total Percent, Held-to-maturity | 0.15% | 100.00%
Government Agency/GSEs [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Amortized Cost, Available-for-sale | $ 5,752 | $ 339,071
Gross Unrealized Holding Gain, Available-for-sale |  | 0
Gross Unrealized Holding Loss, Available-for-sale | (7) | (8,228)
Fair Value, Available-for-sale | $ 5,745 | $ 330,843
Total Percent, Available-for-sale | 0.24% | 10.55%
Amortized Cost, Held-to-maturity | $ 293,338 |
Gross Unrealized Holding Gain, Held-to-maturity | 1,176 |
Gross Unrealized Holding Loss, Held-to-maturity | (734) |
Fair Value, Held-to-maturity | $ 293,780 |
Total Percent, Held-to-maturity | 34.47% |
Residential Mortgage-backed Securities [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,788,857 | $ 1,884,370
Gross Unrealized Holding Gain, Available-for-sale | 26,001 | 36,154
Gross Unrealized Holding Loss, Available-for-sale | (1,761) | (3,028)
Fair Value, Available-for-sale | $ 1,813,097 | $ 1,917,496
Total Percent, Available-for-sale | 76.55% | 61.12%
Amortized Cost, Held-to-maturity | $ 232,053 |
Gross Unrealized Holding Gain, Held-to-maturity | 0 |
Gross Unrealized Holding Loss, Held-to-maturity | (1,293) |
Fair Value, Held-to-maturity | $ 230,760 |
Total Percent, Held-to-maturity | 27.27% |
Municipal Bonds [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Amortized Cost, Available-for-sale | $ 157,940 | $ 557,823
Gross Unrealized Holding Gain, Available-for-sale | 3,036 | 22,463
Gross Unrealized Holding Loss, Available-for-sale | (3) | (645)
Fair Value, Available-for-sale | $ 160,973 | $ 579,641
Total Percent, Available-for-sale | 6.80% | 18.48%
Amortized Cost, Held-to-maturity | $ 324,314 |
Gross Unrealized Holding Gain, Held-to-maturity | 3,051 |
Gross Unrealized Holding Loss, Held-to-maturity | (719) |
Fair Value, Held-to-maturity | $ 326,646 |
Total Percent, Held-to-maturity | 38.11% |
Other Securities [Member] |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |
Amortized Cost, Available-for-sale | $ 5,000 | $ 5,000
Gross Unrealized Holding Gain, Available-for-sale | 50 | 87
Gross Unrealized Holding Loss, Available-for-sale |  | 0
Fair Value, Available-for-sale | $ 5,050 | $ 5,087
Total Percent, Available-for-sale | 0.21% | 0.16%

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