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INVESTMENT SECURITIES (Unrealized Gains and Losses by Category) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Securities Available-for-Sale, Amortized Cost    
12 months or more $ 782,921 $ 171,011
Less than 12 months 555,271 1,323,800
Amortized Cost 1,338,192 1,494,811
Held-to-Maturity, Amortized Cost    
Total 530,880 535,070
Securities Available-for-Sale, Unrealized Loss    
12 months or more 80,057 33,027
Less than 12 months 14,297 78,004
Total 94,354 111,031
Held-to-Maturity, Unrealized Loss    
Total 59,265 65,884
Securities Available-for-Sale, Fair Value    
12 months or more 702,864 137,984
Less than 12 months 540,974 1,245,796
Total 1,243,838 1,383,780
Held-to-Maturity, Fair Value    
Total 471,615 469,186
CMOs issued by US Government-sponsored agencies    
Securities Available-for-Sale, Amortized Cost    
12 months or more 14,120 337
Less than 12 months   15,297
Amortized Cost 14,120 15,634
Securities Available-for-Sale, Unrealized Loss    
12 months or more 649 7
Less than 12 months   776
Total 649 783
Securities Available-for-Sale, Fair Value    
12 months or more 13,471 330
Less than 12 months   14,521
Total 13,471 14,851
FNMA and FHLMC certificates    
Securities Available-for-Sale, Amortized Cost    
12 months or more 508,868 88,600
Less than 12 months 296,396 745,566
Amortized Cost 805,264 834,166
Held-to-Maturity, Amortized Cost    
12 months or more 332,852 337,435
Total 332,852 337,435
Securities Available-for-Sale, Unrealized Loss    
12 months or more 48,105 18,989
Less than 12 months 11,572 50,657
Total 59,677 69,646
Held-to-Maturity, Unrealized Loss    
12 months or more 56,683 62,358
Total 56,683 62,358
Securities Available-for-Sale, Fair Value    
12 months or more 460,763 69,611
Less than 12 months 284,824 694,909
Total 745,587 764,520
Held-to-Maturity, Fair Value    
12 months or more 276,169 275,077
Total 276,169 275,077
GNMA Securities    
Securities Available-for-Sale, Amortized Cost    
12 months or more 259,933 82,074
Less than 12 months 55,584 251,835
Amortized Cost 315,517 333,909
Securities Available-for-Sale, Unrealized Loss    
12 months or more 31,303 14,031
Less than 12 months 1,612 24,838
Total 32,915 38,869
Securities Available-for-Sale, Fair Value    
12 months or more 228,630 68,043
Less than 12 months 53,972 226,997
Total 282,602 295,040
US Treasury securities    
Securities Available-for-Sale, Amortized Cost    
Less than 12 months 203,081 310,862
Amortized Cost 203,081 310,862
Held-to-Maturity, Amortized Cost    
Less than 12 months 198,028 197,635
Total 198,028 197,635
Securities Available-for-Sale, Unrealized Loss    
Less than 12 months 1,109 1,729
Total 1,109 1,729
Held-to-Maturity, Unrealized Loss    
Less than 12 months 2,582 3,526
Total 2,582 3,526
Securities Available-for-Sale, Fair Value    
Less than 12 months 201,972 309,133
Total 201,972 309,133
Held-to-Maturity, Fair Value    
Less than 12 months 195,446 194,109
Total 195,446 194,109
Other debt securities available for sale    
Securities Available-for-Sale, Amortized Cost    
Less than 12 months 210 240
Amortized Cost 210 240
Securities Available-for-Sale, Unrealized Loss    
Less than 12 months 4 4
Total 4 4
Securities Available-for-Sale, Fair Value    
Less than 12 months 206 236
Total $ 206 $ 236