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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,964,251 | $ 2,078,131
Gross Unrealized Holding Gain, Available-for-sale | 2,246 | 13,282
Gross Unrealized Holding Loss, Available-for-sale | (36,503) | (10,428)
Fair Value, Available-for-sale | $ 1,929,994 | $ 2,080,985
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 772,469 | $ 829,890
Gross Unrealized Holding Gain, Held-to-maturity | 980 | 4,272
Gross Unrealized Holding Loss, Held-to-maturity | (25,860) | (14,947)
Fair Value, Held-to-maturity | $ 747,589 | $ 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 | $ 244,227 | $ 274,634
Gross Unrealized Holding Gain, Available-for-sale | 357 | 1,277
Gross Unrealized Holding Loss, Available-for-sale | (5,073) | (2,082)
Fair Value, Available-for-sale | $ 239,511 | $ 273,829
Total Percent, Available-for-sale | 12.41% | 13.16%
Amortized Cost, Held-to-maturity | $ 219,159 | $ 225,072
Gross Unrealized Holding Gain, Held-to-maturity | 0 | 0
Gross Unrealized Holding Loss, Held-to-maturity | (12,773) | (8,641)
Fair Value, Held-to-maturity | $ 206,386 | $ 216,431
Total Percent, Held-to-maturity | 28.37% | 27.12%
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Held-to-maturity | $ 149,693 | $ 159,716
Gross Unrealized Holding Gain, Held-to-maturity | 406 | 854
Gross Unrealized Holding Loss, Held-to-maturity | (2,948) | (2,134)
Fair Value, Held-to-maturity | $ 147,151 | $ 158,436
Total Percent, Held-to-maturity | 19.38% | 19.25%
Residential Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,665,717 | $ 1,747,780
Gross Unrealized Holding Gain, Available-for-sale | 1,489 | 11,231
Gross Unrealized Holding Loss, Available-for-sale | (30,322) | (8,102)
Fair Value, Available-for-sale | $ 1,636,884 | $ 1,750,909
Total Percent, Available-for-sale | 84.81% | 84.14%
Amortized Cost, Held-to-maturity | $ 164,914 | $ 176,427
Gross Unrealized Holding Gain, Held-to-maturity | 0 | 667
Gross Unrealized Holding Loss, Held-to-maturity | (4,020) | (382)
Fair Value, Held-to-maturity | $ 160,894 | $ 176,712
Total Percent, Held-to-maturity | 21.35% | 21.26%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 53,557 | $ 54,966
Gross Unrealized Holding Gain, Available-for-sale | 400 | 774
Gross Unrealized Holding Loss, Available-for-sale | (1,108) | (244)
Fair Value, Available-for-sale | $ 52,849 | $ 55,496
Total Percent, Available-for-sale | 2.74% | 2.66%
Amortized Cost, Held-to-maturity | $ 238,703 | $ 268,675
Gross Unrealized Holding Gain, Held-to-maturity | 574 | 2,751
Gross Unrealized Holding Loss, Held-to-maturity | (6,119) | (3,790)
Fair Value, Held-to-maturity | $ 233,158 | $ 267,636
Total Percent, Held-to-maturity | 30.90% | 32.37%
Other Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 750 | $ 751
Gross Unrealized Holding Gain, Available-for-sale | 0 | 0
Gross Unrealized Holding Loss, Available-for-sale | 0 | 0
Fair Value, Available-for-sale | $ 750 | $ 751
Total Percent, Available-for-sale | 0.04% | 0.04%

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