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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - HTM) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 544,491 $ 549,024
Gross Unrealized Gains 54 55
Gross Unrealized Losses 60,888 58,315
Fair Value $ 483,657 $ 490,764
Weighted Average Yield 2.61% 2.60%
Due less than 1 year | Investment securities | US Treasury securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 199,727 $ 199,314
Gross Unrealized Gains 0 0
Gross Unrealized Losses 647 1,548
Fair Value $ 199,080 $ 197,766
Weighted Average Yield 3.32% 3.33%
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 $ 35,000
Gross Unrealized Gains 54 55
Gross Unrealized Losses 0  
Fair Value $ 35,054 $ 35,055
Weighted Average Yield 6.33% 6.36%
Due after 10 years | Mortgage-backed securities | FNMA and FHLMC certificates    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 309,764 $ 314,710
Gross Unrealized Gains 0 0
Gross Unrealized Losses 60,241 56,767
Fair Value $ 249,523 $ 257,943
Weighted Average Yield 1.73% 1.72%