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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 3,755,297 | $ 3,185,249
Gross Unrealized Holding Gain, Available-for-sale | 106 | 28,562
Gross Unrealized Holding Loss, Available-for-sale | (500,192) | (29,888)
Fair Value, Available-for-sale | $ 3,255,211 | $ 3,183,923
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 2,554,301 | $ 1,925,970
Gross Unrealized Holding Gain, Held-to-maturity | 913 | 15,326
Gross Unrealized Holding Loss, Held-to-maturity | (399,627) | (19,603)
Fair Value, Held-to-maturity | $ 2,155,587 | $ 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 | $ 548,771 | $ 576,899
Gross Unrealized Holding Gain, Held-to-maturity | 0 | 5,907
Gross Unrealized Holding Loss, Held-to-maturity | (114,343) | (7,312)
Fair Value, Held-to-maturity | $ 434,428 | $ 575,494
Total Percent, Held-to-maturity | 21.48% | 29.95%
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 3,192,151 | $ 2,553,246
Gross Unrealized Holding Gain, Available-for-sale | 39 | 25,873
Gross Unrealized Holding Loss, Available-for-sale | (403,049) | (15,905)
Fair Value, Available-for-sale | $ 2,789,141 | $ 2,563,214
Total Percent, Available-for-sale | 85.68% | 80.50%
Amortized Cost, Held-to-maturity | $ 706,796 | $ 647,390
Gross Unrealized Holding Gain, Held-to-maturity | 0 | 4,109
Gross Unrealized Holding Loss, Held-to-maturity | (105,867) | (6,106)
Fair Value, Held-to-maturity | $ 600,929 | $ 645,393
Total Percent, Held-to-maturity | 27.67% | 33.61%
CMO/REMIC |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 535,269 | $ 602,555
Gross Unrealized Holding Gain, Available-for-sale | 0 | 1,586
Gross Unrealized Holding Loss, Available-for-sale | (95,966) | (13,983)
Fair Value, Available-for-sale | $ 439,303 | $ 590,158
Total Percent, Available-for-sale | 13.50% | 18.53%
Amortized Cost, Held-to-maturity | $ 827,346 | $ 490,670
Gross Unrealized Holding Gain, Held-to-maturity | 0 | 596
Gross Unrealized Holding Loss, Held-to-maturity | (131,730) | (5,030)
Fair Value, Held-to-maturity | $ 695,616 | $ 486,236
Total Percent, Held-to-maturity | 32.39% | 25.48%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 26,797 | $ 28,365
Gross Unrealized Holding Gain, Available-for-sale | 67 | 1,103
Gross Unrealized Holding Loss, Available-for-sale | (1,177) | 0
Fair Value, Available-for-sale | $ 25,687 | $ 29,468
Total Percent, Available-for-sale | 0.79% | 0.93%
Amortized Cost, Held-to-maturity | $ 471,388 | $ 211,011
Gross Unrealized Holding Gain, Held-to-maturity | 913 | 4,714
Gross Unrealized Holding Loss, Held-to-maturity | (47,687) | (1,155)
Fair Value, Held-to-maturity | $ 424,614 | $ 214,570
Total Percent, Held-to-maturity | 18.46% | 10.96%
Other Securities |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,080 | $ 1,083
Gross Unrealized Holding Gain, Available-for-sale | 0 | 0
Gross Unrealized Holding Loss, Available-for-sale | 0 | 0
Fair Value, Available-for-sale | $ 1,080 | $ 1,083
Total Percent, Available-for-sale | 0.03% | 0.04%

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