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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
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%