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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 3,972,437 $ 3,185,249
Gross Unrealized Holding Gain, Available-for-sale 531 28,562
Gross Unrealized Holding Loss, Available-for-sale (346,811) (29,888)
Investment securities available-for-sale $ 3,626,157 $ 3,183,923
Total Percent, Available-for-sale 100.00% 100.00%
Amortized Cost, Held-to-maturity $ 2,412,308 $ 1,925,970
Gross Unrealized Holding Gain, Held-to-maturity 763 15,326
Gross Unrealized Holding Loss, Held-to-maturity (278,888) (19,603)
Fair Value, Held-to-maturity $ 2,134,183 $ 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 $ 557,723 $ 602,555
Gross Unrealized Holding Gain, Available-for-sale 8 1,586
Gross Unrealized Holding Loss, Available-for-sale (67,601) (13,983)
Investment securities available-for-sale $ 490,130 $ 590,158
Total Percent, Available-for-sale 13.52% 18.53%
Amortized Cost, Held-to-maturity $ 799,591 $ 490,670
Gross Unrealized Holding Gain, Held-to-maturity 596
Gross Unrealized Holding Loss, Held-to-maturity (83,786) (5,030)
Fair Value, Held-to-maturity $ 715,805 $ 486,236
Total Percent, Held-to-maturity 33.15% 25.48%
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Held-to-maturity $ 562,287 $ 576,899
Gross Unrealized Holding Gain, Held-to-maturity 359 5,907
Gross Unrealized Holding Loss, Held-to-maturity (82,668) (7,312)
Fair Value, Held-to-maturity $ 479,978 $ 575,494
Total Percent, Held-to-maturity 23.31% 29.95%
Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 3,386,552 $ 2,553,246
Gross Unrealized Holding Gain, Available-for-sale 423 25,873
Gross Unrealized Holding Loss, Available-for-sale (278,060) (15,905)
Investment securities available-for-sale $ 3,108,915 $ 2,563,214
Total Percent, Available-for-sale 85.74% 80.50%
Amortized Cost, Held-to-maturity $ 688,320 $ 647,390
Gross Unrealized Holding Gain, Held-to-maturity 159 4,109
Gross Unrealized Holding Loss, Held-to-maturity (74,344) (6,106)
Fair Value, Held-to-maturity $ 614,135 $ 645,393
Total Percent, Held-to-maturity 28.53% 33.61%
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 27,139 $ 28,365
Gross Unrealized Holding Gain, Available-for-sale 100 1,103
Gross Unrealized Holding Loss, Available-for-sale (1,150) 0
Investment securities available-for-sale $ 26,089 $ 29,468
Total Percent, Available-for-sale 0.72% 0.93%
Amortized Cost, Held-to-maturity $ 362,110 $ 211,011
Gross Unrealized Holding Gain, Held-to-maturity 245 4,714
Gross Unrealized Holding Loss, Held-to-maturity (38,090) (1,155)
Fair Value, Held-to-maturity $ 324,265 $ 214,570
Total Percent, Held-to-maturity 15.01% 10.96%
Other Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 1,023 $ 1,083
Gross Unrealized Holding Gain, Available-for-sale 0
Gross Unrealized Holding Loss, Available-for-sale 0
Investment securities available-for-sale $ 1,023 $ 1,083
Total Percent, Available-for-sale 0.02% 0.04%