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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
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%