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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - HTM) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 530,880 $ 535,070
Gross Unrealized Gains 0 0
Gross Unrealized Losses 59,265 65,884
Fair Value $ 471,615 $ 469,186
Weighted Average Yield 2.34% 2.30%
Due from 1 to 5 years | Investment securities | US Treasury securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 198,028 $ 197,635
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2,582 3,526
Fair Value $ 195,446 $ 194,109
Weighted Average Yield 3.36% 3.36%
Due after 10 years | Mortgage-backed securities | FNMA and FHLMC certificates    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 332,852 $ 337,435
Gross Unrealized Gains 0 0
Gross Unrealized Losses 56,683 62,358
Fair Value $ 276,169 $ 275,077
Weighted Average Yield 1.72% 1.71%