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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,850,723 | $ 2,078,131
Gross Unrealized Holding Gain, Available-for-sale | 1,474 | 13,282
Gross Unrealized Holding Loss, Available-for-sale | (45,966) | (10,428)
Fair Value, Available-for-sale | $ 1,806,231 | $ 2,080,985
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 759,029 | $ 829,890
Gross Unrealized Holding Gain, Held-to-maturity | 225 | 4,272
Gross Unrealized Holding Loss, Held-to-maturity | (32,499) | (14,947)
Fair Value, Held-to-maturity | $ 726,755 | $ 819,215
Total Percent, Held-to-maturity | 100.00% | 100.00%
CMO/REMIC - Residential [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 229,832 | $ 274,634
Gross Unrealized Holding Gain, Available-for-sale | 152 | 1,277
Gross Unrealized Holding Loss, Available-for-sale | (6,167) | (2,082)
Fair Value, Available-for-sale | $ 223,817 | $ 273,829
Total Percent, Available-for-sale | 12.39% | 13.16%
Amortized Cost, Held-to-maturity | $ 216,980 | $ 225,072
Gross Unrealized Holding Gain, Held-to-maturity | 0 | 0
Gross Unrealized Holding Loss, Held-to-maturity | (13,960) | (8,641)
Fair Value, Held-to-maturity | $ 203,020 | $ 216,431
Total Percent, Held-to-maturity | 28.58% | 27.12%
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Held-to-maturity | $ 144,871 | $ 159,716
Gross Unrealized Holding Gain, Held-to-maturity | 0 | 854
Gross Unrealized Holding Loss, Held-to-maturity | (5,129) | (2,134)
Fair Value, Held-to-maturity | $ 139,742 | $ 158,436
Total Percent, Held-to-maturity | 19.09% | 19.25%
Residential Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,570,072 | $ 1,747,780
Gross Unrealized Holding Gain, Available-for-sale | 1,014 | 11,231
Gross Unrealized Holding Loss, Available-for-sale | (38,208) | (8,102)
Fair Value, Available-for-sale | $ 1,532,878 | $ 1,750,909
Total Percent, Available-for-sale | 84.87% | 84.14%
Amortized Cost, Held-to-maturity | $ 158,769 | $ 176,427
Gross Unrealized Holding Gain, Held-to-maturity | 0 | 667
Gross Unrealized Holding Loss, Held-to-maturity | (5,502) | (382)
Fair Value, Held-to-maturity | $ 153,267 | $ 176,712
Total Percent, Held-to-maturity | 20.92% | 21.26%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 50,022 | $ 54,966
Gross Unrealized Holding Gain, Available-for-sale | 308 | 774
Gross Unrealized Holding Loss, Available-for-sale | (1,591) | (244)
Fair Value, Available-for-sale | $ 48,739 | $ 55,496
Total Percent, Available-for-sale | 2.70% | 2.66%
Amortized Cost, Held-to-maturity | $ 238,409 | $ 268,675
Gross Unrealized Holding Gain, Held-to-maturity | 225 | 2,751
Gross Unrealized Holding Loss, Held-to-maturity | (7,908) | (3,790)
Fair Value, Held-to-maturity | $ 230,726 | $ 267,636
Total Percent, Held-to-maturity | 31.41% | 32.37%
Other Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 797 | $ 751
Gross Unrealized Holding Gain, Available-for-sale | 0 | 0
Gross Unrealized Holding Loss, Available-for-sale | 0 | 0
Fair Value, Available-for-sale | $ 797 | $ 751
Total Percent, Available-for-sale | 0.04% | 0.04%

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