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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 2,344,174 | $ 1,718,357
Gross Unrealized Holding Gain, Available-for-sale | 55,099 | 23,548
Gross Unrealized Holding Loss, Available-for-sale | (350) | (1,648)
Fair Value, Available-for-sale | $ 2,398,923 | $ 1,740,257
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 578,626 | $ 674,452
Gross Unrealized Holding Gain, Held-to-maturity | 25,703 | 8,230
Gross Unrealized Holding Loss, Held-to-maturity | (106) | (3,734)
Fair Value, Held-to-maturity | $ 604,223 | $ 678,948
Total Percent, Held-to-maturity | 100.00% | 100.00%
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 457,548 | $ 493,214
Gross Unrealized Holding Gain, Available-for-sale | 5,515 | 1,392
Gross Unrealized Holding Loss, Available-for-sale | (249) | (896)
Fair Value, Available-for-sale | $ 462,814 | $ 493,710
Total Percent, Available-for-sale | 19.29% | 28.37%
Amortized Cost, Held-to-maturity | $ 145,309 | $ 192,548
Gross Unrealized Holding Gain, Held-to-maturity | 5,202 |
Gross Unrealized Holding Loss, Held-to-maturity |  | (2,458)
Fair Value, Held-to-maturity | $ 150,511 | $ 190,090
Total Percent, Held-to-maturity | 25.11% | 28.55%
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Held-to-maturity | $ 98,663 | $ 117,366
Gross Unrealized Holding Gain, Held-to-maturity | 5,877 | 2,280
Gross Unrealized Holding Loss, Held-to-maturity |  | (657)
Fair Value, Held-to-maturity | $ 104,540 | $ 118,989
Total Percent, Held-to-maturity | 17.05% | 17.40%
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,857,030 | $ 1,185,757
Gross Unrealized Holding Gain, Available-for-sale | 48,006 | 21,306
Gross Unrealized Holding Loss, Available-for-sale | (101) | (750)
Fair Value, Available-for-sale | $ 1,904,935 | $ 1,206,313
Total Percent, Available-for-sale | 79.41% | 69.32%
Amortized Cost, Held-to-maturity | $ 146,382 | $ 168,479
Gross Unrealized Holding Gain, Held-to-maturity | 7,644 | 2,083
Gross Unrealized Holding Loss, Held-to-maturity | (32) | (54)
Fair Value, Held-to-maturity | $ 153,994 | $ 170,508
Total Percent, Held-to-maturity | 25.30% | 24.98%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 28,707 | $ 38,506
Gross Unrealized Holding Gain, Available-for-sale | 1,578 | 850
Gross Unrealized Holding Loss, Available-for-sale |  | (2)
Fair Value, Available-for-sale | $ 30,285 | $ 39,354
Total Percent, Available-for-sale | 1.26% | 2.26%
Amortized Cost, Held-to-maturity | $ 188,272 | $ 196,059
Gross Unrealized Holding Gain, Held-to-maturity | 6,980 | 3,867
Gross Unrealized Holding Loss, Held-to-maturity | (74) | (565)
Fair Value, Held-to-maturity | $ 195,178 | $ 199,361
Total Percent, Held-to-maturity | 32.54% | 29.07%
Other Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 889 | $ 880
Fair Value, Available-for-sale | $ 889 | $ 880
Total Percent, Available-for-sale | 0.04% | 0.05%

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