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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - AFS) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Amortized Cost $ 2,267,582 $ 2,177,761
Gross Unrealized Gains 32,887 13,476
Gross Unrealized Losses 70,367 91,973
Fair Value $ 2,230,102 $ 2,099,264
Weighted Average Yield 4.19% 4.07%
Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 2,265,879 $ 1,880,395
Gross Unrealized Gains 32,886 13,424
Gross Unrealized Losses 70,366 91,970
Fair Value $ 2,228,399 $ 1,801,849
Weighted Average Yield 4.19% 3.86%
Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,703 $ 297,366
Gross Unrealized Gains 1 52
Gross Unrealized Losses 1 3
Fair Value $ 1,703 $ 297,415
Weighted Average Yield 4.32% 5.39%
FNMA and FHLMC certificates | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,815,924 $ 1,464,134
Gross Unrealized Gains 23,652 8,989
Gross Unrealized Losses 40,594 57,178
Fair Value $ 1,798,982 $ 1,415,945
Weighted Average Yield 4.36% 4.03%
FNMA and FHLMC certificates | Due from 1 to 5 years | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 13,748 $ 6,972
Gross Unrealized Gains 0 0
Gross Unrealized Losses 427 311
Fair Value $ 13,321 $ 6,661
Weighted Average Yield 2.08% 1.76%
FNMA and FHLMC certificates | Due from 5 to 10 years | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 28,114 $ 45,835
Gross Unrealized Gains 0 0
Gross Unrealized Losses 1,321 2,767
Fair Value $ 26,793 $ 43,068
Weighted Average Yield 1.91% 2.00%
FNMA and FHLMC certificates | Due after 10 years | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,774,062 $ 1,411,327
Gross Unrealized Gains 23,652 8,989
Gross Unrealized Losses 38,846 54,100
Fair Value $ 1,758,868 $ 1,366,216
Weighted Average Yield 4.42% 4.11%
GNMA certificates | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 443,285 $ 406,275
Gross Unrealized Gains 9,234 4,435
Gross Unrealized Losses 29,616 34,416
Fair Value $ 422,903 $ 376,294
Weighted Average Yield 3.54% 3.30%
GNMA certificates | Due less than 1 year | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost   $ 5
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Fair Value   $ 5
Weighted Average Yield   1.31%
GNMA certificates | Due from 1 to 5 years | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 7,131 $ 8,851
Gross Unrealized Gains 0 0
Gross Unrealized Losses 195 351
Fair Value $ 6,936 $ 8,500
Weighted Average Yield 1.73% 1.71%
GNMA certificates | Due from 5 to 10 years | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 12,344 $ 17,113
Gross Unrealized Gains 14 16
Gross Unrealized Losses 515 955
Fair Value $ 11,843 $ 16,174
Weighted Average Yield 2.25% 2.19%
GNMA certificates | Due after 10 years | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 423,810 $ 380,306
Gross Unrealized Gains 9,220 4,419
Gross Unrealized Losses 28,906 33,110
Fair Value $ 404,124 $ 351,615
Weighted Average Yield 3.61% 3.38%
CMOs issued by US government-sponsored agencies | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 6,670 $ 9,986
Gross Unrealized Gains 0 0
Gross Unrealized Losses 156 376
Fair Value $ 6,514 $ 9,610
Weighted Average Yield 2.16% 2.06%
CMOs issued by US government-sponsored agencies | Due from 1 to 5 years | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 5,901 $ 9,071
Gross Unrealized Gains 0 0
Gross Unrealized Losses 151 364
Fair Value $ 5,750 $ 8,707
Weighted Average Yield 1.78% 1.78%
CMOs issued by US government-sponsored agencies | Due from 5 to 10 years | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost   $ 54
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Fair Value   $ 54
Weighted Average Yield   2.14%
CMOs issued by US government-sponsored agencies | Due after 10 years | Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 769 $ 861
Gross Unrealized Gains 0 0
Gross Unrealized Losses 5 12
Fair Value $ 764 $ 849
Weighted Average Yield 5.06% 5.07%
US Treasury securities | Due less than 1 year | Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,135 $ 296,747
Gross Unrealized Gains 1 52
Gross Unrealized Losses 0 0
Fair Value $ 1,136 $ 296,799
Weighted Average Yield 4.88% 5.40%
Other debt securities | Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 568 $ 619
Gross Unrealized Gains 0 0
Gross Unrealized Losses 1 3
Fair Value $ 567 $ 616
Weighted Average Yield 3.22% 3.20%
Other debt securities | Due less than 1 year | Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 500 $ 500
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 500 $ 500
Weighted Average Yield 3.25% 3.25%
Other debt securities | Due from 1 to 5 years | Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 68 $ 119
Gross Unrealized Gains 0 0
Gross Unrealized Losses 1 3
Fair Value $ 67 $ 116
Weighted Average Yield 2.97% 2.97%