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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 2,235,684 | $ 2,337,715
Gross Unrealized Holding Gain, Available-for-sale | 59,034 | 33,776
Gross Unrealized Holding Loss, Available-for-sale | (59) | (2,845)
Fair Value, Available-for-sale | $ 2,294,659 | $ 2,368,646
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 812,893 | $ 850,989
Gross Unrealized Holding Gain, Held-to-maturity | 14,059 | 4,796
Gross Unrealized Holding Loss, Held-to-maturity | (1,024) | (2,746)
Fair Value, Held-to-maturity | $ 825,928 | $ 853,039
Total Percent, Held-to-maturity | 100.00% | 100.00%
CMO's/REMIC's - Residential [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 360,790 | $ 380,166
Gross Unrealized Holding Gain, Available-for-sale | 7,745 | 4,689
Gross Unrealized Holding Loss, Available-for-sale | 0 | (1,074)
Fair Value, Available-for-sale | $ 368,535 | $ 383,781
Total Percent, Available-for-sale | 16.06% | 16.20%
Amortized Cost, Held-to-maturity | $ 1,226 | $ 1,284
Gross Unrealized Holding Gain, Held-to-maturity | 499 | 569
Gross Unrealized Holding Loss, Held-to-maturity | 0 | 0
Fair Value, Held-to-maturity | $ 1,725 | $ 1,853
Total Percent, Held-to-maturity | 0.15% | 0.15%
Government Agency/GSEs [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 5,750 | $ 5,752
Gross Unrealized Holding Gain, Available-for-sale | 10 | 0
Gross Unrealized Holding Loss, Available-for-sale | 0 | (7)
Fair Value, Available-for-sale | $ 5,760 | $ 5,745
Total Percent, Available-for-sale | 0.25% | 0.24%
Amortized Cost, Held-to-maturity | $ 272,934 | $ 293,338
Gross Unrealized Holding Gain, Held-to-maturity | 5,687 | 1,176
Gross Unrealized Holding Loss, Held-to-maturity | 0 | (734)
Fair Value, Held-to-maturity | $ 278,621 | $ 293,780
Total Percent, Held-to-maturity | 33.58% | 34.47%
Residential Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,710,383 | $ 1,788,857
Gross Unrealized Holding Gain, Available-for-sale | 48,667 | 26,001
Gross Unrealized Holding Loss, Available-for-sale | 0 | (1,761)
Fair Value, Available-for-sale | $ 1,759,050 | $ 1,813,097
Total Percent, Available-for-sale | 76.66% | 76.55%
Amortized Cost, Held-to-maturity | $ 225,079 | $ 232,053
Gross Unrealized Holding Gain, Held-to-maturity | 3,085 | 0
Gross Unrealized Holding Loss, Held-to-maturity | 0 | (1,293)
Fair Value, Held-to-maturity | $ 228,164 | $ 230,760
Total Percent, Held-to-maturity | 27.69% | 27.27%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 153,761 | $ 157,940
Gross Unrealized Holding Gain, Available-for-sale | 2,523 | 3,036
Gross Unrealized Holding Loss, Available-for-sale | (59) | (3)
Fair Value, Available-for-sale | $ 156,225 | $ 160,973
Total Percent, Available-for-sale | 6.81% | 6.80%
Amortized Cost, Held-to-maturity | $ 313,654 | $ 324,314
Gross Unrealized Holding Gain, Held-to-maturity | 4,788 | 3,051
Gross Unrealized Holding Loss, Held-to-maturity | (1,024) | (719)
Fair Value, Held-to-maturity | $ 317,418 | $ 326,646
Total Percent, Held-to-maturity | 38.58% | 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 | 89 | 50
Gross Unrealized Holding Loss, Available-for-sale | 0 | 0
Fair Value, Available-for-sale | $ 5,089 | $ 5,050
Total Percent, Available-for-sale | 0.22% | 0.21%

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