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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - HTM) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 549,024 $ 535,070
Gross Unrealized Gains 55 0
Gross Unrealized Losses 58,315 65,884
Fair Value $ 490,764 $ 469,186
Weighted Average Yield 2.60% 2.30%
Amortized Cost $ 2,177,761 $ 1,522,812
Gross Unrealized Gains 13,476 995
Gross Unrealized Losses 91,973 111,031
Fair Value $ 2,099,264 $ 1,412,776
Weighted Average Yield 4.07% 2.90%
Mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 1,880,395 $ 1,210,834
Gross Unrealized Gains 13,424 965
Gross Unrealized Losses 91,970 109,298
Fair Value $ 1,801,849 $ 1,102,501
Weighted Average Yield 3.86% 2.79%
Mortgage-backed securities | FNMA and FHLMC certificates    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 1,464,134 $ 837,703
Gross Unrealized Gains 8,989 59
Gross Unrealized Losses 57,178 69,646
Fair Value $ 1,415,945 $ 768,116
Weighted Average Yield 4.03% 2.79%
Investment securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 297,366 $ 311,978
Gross Unrealized Gains 52 30
Gross Unrealized Losses 3 1,733
Fair Value $ 297,415 $ 310,275
Weighted Average Yield 5.39% 3.35%
Due less than 1 year | Investment securities | US Treasury securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 199,314  
Gross Unrealized Gains 0  
Gross Unrealized Losses 1,548  
Fair Value $ 197,766  
Weighted Average Yield 3.33%  
Amortized Cost $ 296,747 $ 310,862
Gross Unrealized Gains 52 0
Gross Unrealized Losses 0 1,729
Fair Value $ 296,799 $ 309,133
Weighted Average Yield 5.40% 3.34%
Due less than 1 year | Investment securities | Other debt securities available for sale    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 500  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value $ 500  
Weighted Average Yield 3.25%  
Due from 1 to 5 years | Mortgage-backed securities | FNMA and FHLMC certificates    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 6,972 $ 10,155
Gross Unrealized Gains 0 0
Gross Unrealized Losses 311 550
Fair Value $ 6,661 $ 9,605
Weighted Average Yield 1.76% 1.76%
Due from 1 to 5 years | Investment securities | US Treasury securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost   $ 197,635
Gross Unrealized Gains   0
Gross Unrealized Losses   3,526
Fair Value   $ 194,109
Weighted Average Yield   3.36%
Due from 1 to 5 years | Investment securities | Other debt securities available for sale    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 35,000  
Gross Unrealized Gains 55  
Gross Unrealized Losses 0  
Fair Value $ 35,055  
Weighted Average Yield 6.36%  
Amortized Cost $ 119 $ 1,116
Gross Unrealized Gains 0 30
Gross Unrealized Losses 3 4
Fair Value $ 116 $ 1,142
Weighted Average Yield 2.97% 4.45%
Due after 10 years | Mortgage-backed securities | FNMA and FHLMC certificates    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 314,710 $ 337,435
Gross Unrealized Gains 0 0
Gross Unrealized Losses 56,767 62,358
Fair Value $ 257,943 $ 275,077
Weighted Average Yield 1.72% 1.71%
Amortized Cost $ 1,411,327 $ 768,381
Gross Unrealized Gains 8,989 59
Gross Unrealized Losses 54,100 65,332
Fair Value $ 1,366,216 $ 703,108
Weighted Average Yield 4.11% 2.87%