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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 2,181,478 | $ 2,337,715
Gross Unrealized Holding Gain, Available-for-sale | 66,555 | 33,776
Gross Unrealized Holding Loss, Available-for-sale | (1) | (2,845)
Fair Value, Available-for-sale | $ 2,248,032 | $ 2,368,646
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 724,357 | $ 850,989
Gross Unrealized Holding Gain, Held-to-maturity | 20,094 | 4,796
Gross Unrealized Holding Loss, Held-to-maturity | (970) | (2,746)
Fair Value, Held-to-maturity | $ 743,481 | $ 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 | $ 388,881 | $ 380,166
Gross Unrealized Holding Gain, Available-for-sale | 9,015 | 4,689
Gross Unrealized Holding Loss, Available-for-sale | 0 | (1,074)
Fair Value, Available-for-sale | $ 397,896 | $ 383,781
Total Percent, Available-for-sale | 17.70% | 16.20%
Amortized Cost, Held-to-maturity | $ 974 | $ 1,284
Gross Unrealized Holding Gain, Held-to-maturity | 501 | 569
Gross Unrealized Holding Loss, Held-to-maturity | 0 | 0
Fair Value, Held-to-maturity | $ 1,475 | $ 1,853
Total Percent, Held-to-maturity | 0.13% | 0.15%
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 4,750 | $ 5,752
Gross Unrealized Holding Gain, Available-for-sale | 13 | 0
Gross Unrealized Holding Loss, Available-for-sale | 0 | (7)
Fair Value, Available-for-sale | $ 4,763 | $ 5,745
Total Percent, Available-for-sale | 0.21% | 0.24%
Amortized Cost, Held-to-maturity | $ 209,301 | $ 293,338
Gross Unrealized Holding Gain, Held-to-maturity | 6,336 | 1,176
Gross Unrealized Holding Loss, Held-to-maturity | 0 | (734)
Fair Value, Held-to-maturity | $ 215,637 | $ 293,780
Total Percent, Held-to-maturity | 28.90% | 34.47%
Residential Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,663,091 | $ 1,788,857
Gross Unrealized Holding Gain, Available-for-sale | 54,359 | 26,001
Gross Unrealized Holding Loss, Available-for-sale | 0 | (1,761)
Fair Value, Available-for-sale | $ 1,717,450 | $ 1,813,097
Total Percent, Available-for-sale | 76.40% | 76.55%
Amortized Cost, Held-to-maturity | $ 215,762 | $ 232,053
Gross Unrealized Holding Gain, Held-to-maturity | 6,274 | 0
Gross Unrealized Holding Loss, Held-to-maturity | 0 | (1,293)
Fair Value, Held-to-maturity | $ 222,036 | $ 230,760
Total Percent, Held-to-maturity | 29.79% | 27.27%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 119,756 | $ 157,940
Gross Unrealized Holding Gain, Available-for-sale | 2,893 | 3,036
Gross Unrealized Holding Loss, Available-for-sale | (1) | (3)
Fair Value, Available-for-sale | $ 122,648 | $ 160,973
Total Percent, Available-for-sale | 5.46% | 6.80%
Amortized Cost, Held-to-maturity | $ 298,320 | $ 324,314
Gross Unrealized Holding Gain, Held-to-maturity | 6,983 | 3,051
Gross Unrealized Holding Loss, Held-to-maturity | (970) | (719)
Fair Value, Held-to-maturity | $ 304,333 | $ 326,646
Total Percent, Held-to-maturity | 41.18% | 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 | 275 | 50
Gross Unrealized Holding Loss, Available-for-sale | 0 | 0
Fair Value, Available-for-sale | $ 5,275 | $ 5,050
Total Percent, Available-for-sale | 0.23% | 0.21%

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