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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 3,972,437 | $ 3,185,249
Gross Unrealized Holding Gain, Available-for-sale | 531 | 28,562
Gross Unrealized Holding Loss, Available-for-sale | (346,811) | (29,888)
Investment securities available-for-sale | $ 3,626,157 | $ 3,183,923
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 2,412,308 | $ 1,925,970
Gross Unrealized Holding Gain, Held-to-maturity | 763 | 15,326
Gross Unrealized Holding Loss, Held-to-maturity | (278,888) | (19,603)
Fair Value, Held-to-maturity | $ 2,134,183 | $ 1,921,693
Total Percent, Held-to-maturity | 100.00% | 100.00%
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 557,723 | $ 602,555
Gross Unrealized Holding Gain, Available-for-sale | 8 | 1,586
Gross Unrealized Holding Loss, Available-for-sale | (67,601) | (13,983)
Investment securities available-for-sale | $ 490,130 | $ 590,158
Total Percent, Available-for-sale | 13.52% | 18.53%
Amortized Cost, Held-to-maturity | $ 799,591 | $ 490,670
Gross Unrealized Holding Gain, Held-to-maturity |  | 596
Gross Unrealized Holding Loss, Held-to-maturity | (83,786) | (5,030)
Fair Value, Held-to-maturity | $ 715,805 | $ 486,236
Total Percent, Held-to-maturity | 33.15% | 25.48%
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Held-to-maturity | $ 562,287 | $ 576,899
Gross Unrealized Holding Gain, Held-to-maturity | 359 | 5,907
Gross Unrealized Holding Loss, Held-to-maturity | (82,668) | (7,312)
Fair Value, Held-to-maturity | $ 479,978 | $ 575,494
Total Percent, Held-to-maturity | 23.31% | 29.95%
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 3,386,552 | $ 2,553,246
Gross Unrealized Holding Gain, Available-for-sale | 423 | 25,873
Gross Unrealized Holding Loss, Available-for-sale | (278,060) | (15,905)
Investment securities available-for-sale | $ 3,108,915 | $ 2,563,214
Total Percent, Available-for-sale | 85.74% | 80.50%
Amortized Cost, Held-to-maturity | $ 688,320 | $ 647,390
Gross Unrealized Holding Gain, Held-to-maturity | 159 | 4,109
Gross Unrealized Holding Loss, Held-to-maturity | (74,344) | (6,106)
Fair Value, Held-to-maturity | $ 614,135 | $ 645,393
Total Percent, Held-to-maturity | 28.53% | 33.61%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 27,139 | $ 28,365
Gross Unrealized Holding Gain, Available-for-sale | 100 | 1,103
Gross Unrealized Holding Loss, Available-for-sale | (1,150) | 0
Investment securities available-for-sale | $ 26,089 | $ 29,468
Total Percent, Available-for-sale | 0.72% | 0.93%
Amortized Cost, Held-to-maturity | $ 362,110 | $ 211,011
Gross Unrealized Holding Gain, Held-to-maturity | 245 | 4,714
Gross Unrealized Holding Loss, Held-to-maturity | (38,090) | (1,155)
Fair Value, Held-to-maturity | $ 324,265 | $ 214,570
Total Percent, Held-to-maturity | 15.01% | 10.96%
Other Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,023 | $ 1,083
Gross Unrealized Holding Gain, Available-for-sale |  | 0
Gross Unrealized Holding Loss, Available-for-sale |  | 0
Investment securities available-for-sale | $ 1,023 | $ 1,083
Total Percent, Available-for-sale | 0.02% | 0.04%

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