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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 3,850,724 | $ 3,185,249
Gross Unrealized Holding Gain, Available-for-sale | 4,256 | 28,562
Gross Unrealized Holding Loss, Available-for-sale | (207,650) | (29,888)
Investment securities available-for-sale | $ 3,647,330 | $ 3,183,923
Total Percent, Available-for-sale | 100.00% | 100.00%
Amortized Cost, Held-to-maturity | $ 2,362,741 | $ 1,925,970
Gross Unrealized Holding Gain, Held-to-maturity | 1,707 | 15,326
Gross Unrealized Holding Loss, Held-to-maturity | (161,304) | (19,603)
Fair Value, Held-to-maturity | $ 2,203,144 | $ 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 | $ 578,213 | $ 602,555
Gross Unrealized Holding Gain, Available-for-sale | 65 | 1,586
Gross Unrealized Holding Loss, Available-for-sale | (41,281) | (13,983)
Investment securities available-for-sale | $ 536,997 | $ 590,158
Total Percent, Available-for-sale | 14.72% | 18.53%
Amortized Cost, Held-to-maturity | $ 818,279 | $ 490,670
Gross Unrealized Holding Gain, Held-to-maturity | 0 | 596
Gross Unrealized Holding Loss, Held-to-maturity | (44,778) | (5,030)
Fair Value, Held-to-maturity | $ 773,501 | $ 486,236
Total Percent, Held-to-maturity | 34.63% | 25.48%
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Held-to-maturity | $ 570,332 | $ 576,899
Gross Unrealized Holding Gain, Held-to-maturity | 722 | 5,907
Gross Unrealized Holding Loss, Held-to-maturity | (52,738) | (7,312)
Fair Value, Held-to-maturity | $ 518,316 | $ 575,494
Total Percent, Held-to-maturity | 24.14% | 29.95%
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 3,243,037 | $ 2,553,246
Gross Unrealized Holding Gain, Available-for-sale | 3,973 | 25,873
Gross Unrealized Holding Loss, Available-for-sale | (166,018) | (15,905)
Investment securities available-for-sale | $ 3,080,992 | $ 2,563,214
Total Percent, Available-for-sale | 84.47% | 80.50%
Amortized Cost, Held-to-maturity | $ 632,012 | $ 647,390
Gross Unrealized Holding Gain, Held-to-maturity | 227 | 4,109
Gross Unrealized Holding Loss, Held-to-maturity | (43,928) | (6,106)
Fair Value, Held-to-maturity | $ 588,311 | $ 645,393
Total Percent, Held-to-maturity | 26.75% | 33.61%
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 28,364 | $ 28,365
Gross Unrealized Holding Gain, Available-for-sale | 218 | 1,103
Gross Unrealized Holding Loss, Available-for-sale | (351) | 0
Investment securities available-for-sale | $ 28,231 | $ 29,468
Total Percent, Available-for-sale | 0.77% | 0.93%
Amortized Cost, Held-to-maturity | $ 342,118 | $ 211,011
Gross Unrealized Holding Gain, Held-to-maturity | 758 | 4,714
Gross Unrealized Holding Loss, Held-to-maturity | (19,860) | (1,155)
Fair Value, Held-to-maturity | $ 323,016 | $ 214,570
Total Percent, Held-to-maturity | 14.48% | 10.96%
Other Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost, Available-for-sale | $ 1,110 | $ 1,083
Gross Unrealized Holding Gain, Available-for-sale | 0 | 0
Gross Unrealized Holding Loss, Available-for-sale | 0 | 0
Investment securities available-for-sale | $ 1,110 | $ 1,083
Total Percent, Available-for-sale | 0.04% | 0.04%

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