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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 2,908,746 | $ 2,344,174
Gross Unrealized Holding Gain, Available-for-sale | 39,509 | 55,099
Gross Unrealized Holding Loss, Available-for-sale | (16,234) | (350)
Investment securities available-for-sale | $ 2,932,021 | $ 2,398,923
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 1,036,924 | $ 578,626
Gross Unrealized Holding Gain, Held-to-maturity | 23,794 | 25,703
Gross Unrealized Holding Loss, Held-to-maturity | (5,195) | (106)
Fair Value, Held-to-maturity | $ 1,055,523 | $ 604,223
Total Percent, Held-to-maturity | 100.00% | 100.00%
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 660,322 | $ 457,548
Gross Unrealized Holding Gain, Available-for-sale | 3,575 | 5,515
Gross Unrealized Holding Loss, Available-for-sale | (5,348) | (249)
Investment securities available-for-sale | $ 658,549 | $ 462,814
Total Percent, Available-for-sale | 22.46% | 19.29%
Amortized Cost, Held-to-maturity | $ 106,699 | $ 145,309
Gross Unrealized Holding Gain, Held-to-maturity | 2,298 | 5,202
Gross Unrealized Holding Loss, Held-to-maturity | 0 | 0
Fair Value, Held-to-maturity | $ 108,997 | $ 150,511
Total Percent, Held-to-maturity | 10.29% | 25.11%
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Held-to-maturity | $ 592,611 | $ 98,663
Gross Unrealized Holding Gain, Held-to-maturity | 10,233 | 5,877
Gross Unrealized Holding Loss, Held-to-maturity | (4,115) | 0
Fair Value, Held-to-maturity | $ 598,729 | $ 104,540
Total Percent, Held-to-maturity | 57.15% | 17.05%
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 2,218,714 | $ 1,857,030
Gross Unrealized Holding Gain, Available-for-sale | 34,675 | 48,006
Gross Unrealized Holding Loss, Available-for-sale | (10,886) | (101)
Investment securities available-for-sale | $ 2,242,503 | $ 1,904,935
Total Percent, Available-for-sale | 76.48% | 79.41%
Amortized Cost, Held-to-maturity | $ 124,894 | $ 146,382
Gross Unrealized Holding Gain, Held-to-maturity | 5,809 | 7,644
Gross Unrealized Holding Loss, Held-to-maturity | (165) | (32)
Fair Value, Held-to-maturity | $ 130,538 | $ 153,994
Total Percent, Held-to-maturity | 12.05% | 25.30%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 28,700 | $ 28,707
Gross Unrealized Holding Gain, Available-for-sale | 1,259 | 1,578
Gross Unrealized Holding Loss, Available-for-sale | 0 | 0
Investment securities available-for-sale | $ 29,959 | $ 30,285
Total Percent, Available-for-sale | 1.02% | 1.26%
Amortized Cost, Held-to-maturity | $ 212,720 | $ 188,272
Gross Unrealized Holding Gain, Held-to-maturity | 5,454 | 6,980
Gross Unrealized Holding Loss, Held-to-maturity | (915) | (74)
Fair Value, Held-to-maturity | $ 217,259 | $ 195,178
Total Percent, Held-to-maturity | 20.51% | 32.54%
Other Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,010 | $ 889
Gross Unrealized Holding Gain, Available-for-sale | 0 | 0
Gross Unrealized Holding Loss, Available-for-sale | 0 | 0
Investment securities available-for-sale | $ 1,010 | $ 889
Total Percent, Available-for-sale | 0.04% | 0.04%

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