XML 43 R33.htm IDEA: XBRL DOCUMENT v3.22.1
Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
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%