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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - AFS) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Amortized Cost $ 1,445,218 $ 1,522,812
Gross Unrealized Gains 2,242 995
Gross Unrealized Losses 94,354 111,031
Fair Value $ 1,353,106 $ 1,412,776
Weighted Average Yield 2.93% 2.90%
Amortized Cost $ 530,880 $ 535,070
Gross Unrealized Gains 0 0
Gross Unrealized Losses 59,265 65,884
Investment securities held-to-maturity $ 471,615 $ 469,186
Weighted Average Yield 2.34% 2.30%
Mortgage-backed securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,200,929 $ 1,210,834
Gross Unrealized Gains 2,201 965
Gross Unrealized Losses 93,241 109,298
Fair Value $ 1,109,889 $ 1,102,501
Weighted Average Yield 2.83% 2.79%
Mortgage-backed securities | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 819,585 $ 837,703
Gross Unrealized Gains 235 59
Gross Unrealized Losses 59,677 69,646
Fair Value $ 760,143 $ 768,116
Weighted Average Yield 2.81% 2.79%
Mortgage-backed securities | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 367,224 $ 357,497
Gross Unrealized Gains 1,966 906
Gross Unrealized Losses 32,915 38,869
Fair Value $ 336,275 $ 319,534
Weighted Average Yield 2.92% 2.80%
Mortgage-backed securities | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 14,120 $ 15,634
Gross Unrealized Gains 0 0
Gross Unrealized Losses 649 783
Fair Value $ 13,471 $ 14,851
Weighted Average Yield 2.00% 1.99%
Mortgage-backed securities | Due from 1 to 5 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 9,307 $ 10,155
Gross Unrealized Gains 0 0
Gross Unrealized Losses 440 550
Fair Value $ 8,867 $ 9,605
Weighted Average Yield 1.76% 1.76%
Mortgage-backed securities | Due from 1 to 5 years | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 11,053 $ 12,505
Gross Unrealized Gains 0 0
Gross Unrealized Losses 476 632
Fair Value $ 10,577 $ 11,873
Weighted Average Yield 1.66% 1.66%
Mortgage-backed securities | Due from 1 to 5 years | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 12,811 $ 14,190
Gross Unrealized Gains 0 0
Gross Unrealized Losses 624 755
Fair Value $ 12,187 $ 13,435
Weighted Average Yield 1.78% 1.78%
Mortgage-backed securities | Due from 5 to 10 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 55,558 $ 59,167
Gross Unrealized Gains 0 0
Gross Unrealized Losses 3,627 3,764
Fair Value $ 51,931 $ 55,403
Weighted Average Yield 2.00% 2.00%
Mortgage-backed securities | Due from 5 to 10 years | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 23,129 $ 24,575
Gross Unrealized Gains 20 14
Gross Unrealized Losses 1,309 1,585
Fair Value $ 21,840 $ 23,004
Weighted Average Yield 2.14% 2.13%
Mortgage-backed securities | Due from 5 to 10 years | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 377 $ 485
Gross Unrealized Gains 0 0
Gross Unrealized Losses 7 10
Fair Value $ 370 $ 475
Weighted Average Yield 2.14% 2.14%
Mortgage-backed securities | Due after 10 years | FNMA and FHLMC certificates    
Schedule of Investments [Line Items]    
Amortized Cost $ 754,720 $ 768,381
Gross Unrealized Gains 235 59
Gross Unrealized Losses 55,610 65,332
Fair Value $ 699,345 $ 703,108
Weighted Average Yield 2.89% 2.87%
Amortized Cost $ 332,852 $ 337,435
Gross Unrealized Gains 0 0
Gross Unrealized Losses 56,683 62,358
Investment securities held-to-maturity $ 276,169 $ 275,077
Weighted Average Yield 1.72% 1.71%
Mortgage-backed securities | Due after 10 years | GNMA Securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 333,042 $ 320,417
Gross Unrealized Gains 1,946 892
Gross Unrealized Losses 31,130 36,652
Fair Value $ 303,858 $ 284,657
Weighted Average Yield 3.01% 2.90%
Mortgage-backed securities | Due after 10 years | CMOs issued by US government-sponsored agencies    
Schedule of Investments [Line Items]    
Amortized Cost $ 932 $ 959
Gross Unrealized Gains 0 0
Gross Unrealized Losses 18 18
Fair Value $ 914 $ 941
Weighted Average Yield 5.06% 5.06%
Investment securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 244,289 $ 311,978
Gross Unrealized Gains 41 30
Gross Unrealized Losses 1,113 1,733
Fair Value $ 243,217 $ 310,275
Weighted Average Yield 3.41% 3.35%
Investment securities | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 1,086  
Gross Unrealized Gains 37  
Gross Unrealized Losses 4  
Fair Value $ 1,119  
Weighted Average Yield 4.49%  
Investment securities | Due less than 1 year | US Treasury securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 243,203 $ 310,862
Gross Unrealized Gains 4 0
Gross Unrealized Losses 1,109 1,729
Fair Value $ 242,098 $ 309,133
Weighted Average Yield 3.41% 3.34%
Investment securities | Due less than 1 year | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 376  
Gross Unrealized Gains 37  
Gross Unrealized Losses 0  
Fair Value $ 413  
Weighted Average Yield 7.00%  
Investment securities | Due from 1 to 5 years | US Treasury securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 198,028 $ 197,635
Gross Unrealized Gains 0 0
Gross Unrealized Losses 2,582 3,526
Investment securities held-to-maturity $ 195,446 $ 194,109
Weighted Average Yield 3.36% 3.36%
Investment securities | Due from 1 to 5 years | Other debt securities    
Schedule of Investments [Line Items]    
Amortized Cost $ 710 $ 1,116
Gross Unrealized Gains 0 30
Gross Unrealized Losses 4 4
Fair Value $ 706 $ 1,142
Weighted Average Yield 3.17% 4.45%