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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 3,862,216 | $ 3,185,249
Gross Unrealized Holding Gain, Available-for-sale | 77 | 28,562
Gross Unrealized Holding Loss, Available-for-sale | (540,469) | (29,888)
Investment securities available-for-sale | $ 3,321,824 | $ 3,183,923
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 2,557,922 | $ 1,925,970
Gross Unrealized Holding Gain, Held-to-maturity | 8 | 15,326
Gross Unrealized Holding Loss, Held-to-maturity | (406,942) | (19,603)
Fair Value, Held-to-maturity | $ 2,150,988 | $ 1,921,693
Total Percent, Held-to-maturity | 100.00% | 100.00%
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Held-to-maturity | $ 555,777 | $ 576,899
Gross Unrealized Holding Gain, Held-to-maturity |  | 5,907
Gross Unrealized Holding Loss, Held-to-maturity | (113,547) | (7,312)
Fair Value, Held-to-maturity | $ 442,230 | $ 575,494
Total Percent, Held-to-maturity | 21.73% | 29.95%
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 3,288,484 | $ 2,553,246
Gross Unrealized Holding Gain, Available-for-sale | 30 | 25,873
Gross Unrealized Holding Loss, Available-for-sale | (448,585) | (15,905)
Investment securities available-for-sale | $ 2,839,929 | $ 2,563,214
Total Percent, Available-for-sale | 85.49% | 80.50%
Amortized Cost, Held-to-maturity | $ 718,908 | $ 647,390
Gross Unrealized Holding Gain, Held-to-maturity |  | 4,109
Gross Unrealized Holding Loss, Held-to-maturity | (111,359) | (6,106)
Fair Value, Held-to-maturity | $ 607,549 | $ 645,393
Total Percent, Held-to-maturity | 28.10% | 33.61%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 27,140 | $ 28,365
Gross Unrealized Holding Gain, Available-for-sale | 47 | 1,103
Gross Unrealized Holding Loss, Available-for-sale | (2,636) | 0
Investment securities available-for-sale | $ 24,551 | $ 29,468
Total Percent, Available-for-sale | 0.74% | 0.93%
Amortized Cost, Held-to-maturity | $ 443,266 | $ 211,011
Gross Unrealized Holding Gain, Held-to-maturity | 8 | 4,714
Gross Unrealized Holding Loss, Held-to-maturity | (64,088) | (1,155)
Fair Value, Held-to-maturity | $ 379,186 | $ 214,570
Total Percent, Held-to-maturity | 17.33% | 10.96%
Other Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 954 | $ 1,083
Gross Unrealized Holding Gain, Available-for-sale |  | 0
Gross Unrealized Holding Loss, Available-for-sale |  | 0
Investment securities available-for-sale | $ 954 | $ 1,083
Total Percent, Available-for-sale | 0.03% | 0.04%
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 545,638 | $ 602,555
Gross Unrealized Holding Gain, Available-for-sale |  | 1,586
Gross Unrealized Holding Loss, Available-for-sale | (89,248) | (13,983)
Investment securities available-for-sale | $ 456,390 | $ 590,158
Total Percent, Available-for-sale | 13.74% | 18.53%
Amortized Cost, Held-to-maturity | $ 839,971 | $ 490,670
Gross Unrealized Holding Gain, Held-to-maturity |  | 596
Gross Unrealized Holding Loss, Held-to-maturity | (117,948) | (5,030)
Fair Value, Held-to-maturity | $ 722,023 | $ 486,236
Total Percent, Held-to-maturity | 32.84% | 25.48%

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