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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 3,664,184 $ 3,755,297
Gross Unrealized Holding Gain, Available-for-sale 121 106
Gross Unrealized Holding Loss, Available-for-sale (459,781) (500,192)
Fair Value, Available-for-sale $ 3,204,524 $ 3,255,211
Total Percent, Available-for-sale 100.00% 100.00%
Amortized Cost, Held-to-maturity $ 2,535,979 $ 2,554,301
Gross Unrealized Holding Gain, Held-to-maturity 2,405 913
Gross Unrealized Holding Loss, Held-to-maturity (369,815) (399,627)
Fair Value, Held-to-maturity $ 2,168,569 $ 2,155,587
Total Percent, Held-to-maturity 100.00% 100.00%
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Held-to-maturity $ 543,318 $ 548,771
Gross Unrealized Holding Gain, Held-to-maturity 0 0
Gross Unrealized Holding Loss, Held-to-maturity (100,496) (114,343)
Fair Value, Held-to-maturity $ 442,822 $ 434,428
Total Percent, Held-to-maturity 21.42% 21.48%
Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 3,109,387 $ 3,192,151
Gross Unrealized Holding Gain, Available-for-sale 41 39
Gross Unrealized Holding Loss, Available-for-sale (361,563) (403,049)
Fair Value, Available-for-sale $ 2,747,865 $ 2,789,141
Total Percent, Available-for-sale 85.75% 85.68%
Amortized Cost, Held-to-maturity $ 697,766 $ 706,796
Gross Unrealized Holding Gain, Held-to-maturity 0 0
Gross Unrealized Holding Loss, Held-to-maturity (97,818) (105,867)
Fair Value, Held-to-maturity $ 599,948 $ 600,929
Total Percent, Held-to-maturity 27.51% 27.67%
CMO/REMIC [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 526,922 $ 535,269
Gross Unrealized Holding Gain, Available-for-sale 0 0
Gross Unrealized Holding Loss, Available-for-sale (97,500) (95,966)
Fair Value, Available-for-sale $ 429,422 $ 439,303
Total Percent, Available-for-sale 13.39% 13.50%
Amortized Cost, Held-to-maturity $ 822,599 $ 827,346
Gross Unrealized Holding Gain, Held-to-maturity 0 0
Gross Unrealized Holding Loss, Held-to-maturity (134,774) (131,730)
Fair Value, Held-to-maturity $ 687,825 $ 695,616
Total Percent, Held-to-maturity 32.44% 32.39%
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 26,796 $ 26,797
Gross Unrealized Holding Gain, Available-for-sale 80 67
Gross Unrealized Holding Loss, Available-for-sale (718) (1,177)
Fair Value, Available-for-sale $ 26,158 $ 25,687
Total Percent, Available-for-sale 0.82% 0.79%
Amortized Cost, Held-to-maturity $ 472,296 $ 471,388
Gross Unrealized Holding Gain, Held-to-maturity 2,405 913
Gross Unrealized Holding Loss, Held-to-maturity (36,727) (47,687)
Fair Value, Held-to-maturity $ 437,974 $ 424,614
Total Percent, Held-to-maturity 18.63% 18.46%
Other Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 1,079 $ 1,080
Gross Unrealized Holding Gain, Available-for-sale 0 0
Gross Unrealized Holding Loss, Available-for-sale 0 0
Fair Value, Available-for-sale $ 1,079 $ 1,080
Total Percent, Available-for-sale 0.04% 0.03%