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INVESTMENT SECURITIES (Unrealized Gains and Losses by Category) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Securities Available-for-Sale, Amortized Cost    
12 months or more $ 88,419  
Less than 12 months 1,509,416 $ 98,962
Total 1,597,835  
Held-to-Maturity, Amortized Cost    
Less than 12 months 251,626  
Total 540,774  
Securities Available-for-Sale, Unrealized Loss    
12 months or more 20,124  
Less than 12 months 102,210 3,400
Total 122,334  
Held-to-Maturity, Unrealized Loss    
Less than 12 months 12,612  
Total 69,056  
Securities Available-for-Sale, Fair Value    
12 months or more 68,295 0
Less than 12 months 1,407,206 95,562
Total 1,475,501  
Held-to-Maturity, Fair Value    
Less than 12 months 239,014  
Total 471,718  
FNMA and FHLMC certificates    
Securities Available-for-Sale, Amortized Cost    
12 months or more 87,852  
Less than 12 months 759,122 93,440
Total 846,974  
Held-to-Maturity, Amortized Cost    
12 months or more 289,148  
Less than 12 months 54,401 367,507
Total 343,549  
Securities Available-for-Sale, Unrealized Loss    
12 months or more 20,025  
Less than 12 months 59,348 3,200
Total 79,373  
Held-to-Maturity, Unrealized Loss    
12 months or more 56,444  
Less than 12 months 9,645 3,854
Total 66,089  
Securities Available-for-Sale, Fair Value    
12 months or more 67,827  
Less than 12 months 699,774 90,240
Total 767,601  
Held-to-Maturity, Fair Value    
12 months or more 232,704  
Less than 12 months 44,756 363,653
Total 277,460  
GNMA Securities    
Securities Available-for-Sale, Amortized Cost    
12 months or more 567  
Less than 12 months 330,091 5,022
Total 330,658  
Securities Available-for-Sale, Unrealized Loss    
12 months or more 99  
Less than 12 months 40,830 199
Total 40,929  
Securities Available-for-Sale, Fair Value    
12 months or more 468  
Less than 12 months 289,261 4,823
Total 289,729  
CMOs issued by US Government-sponsored agencies    
Securities Available-for-Sale, Amortized Cost    
Less than 12 months 17,254 500
Total 17,254  
Securities Available-for-Sale, Unrealized Loss    
Less than 12 months 755 1
Total 755  
Securities Available-for-Sale, Fair Value    
Less than 12 months 16,499 $ 499
Total 16,499  
US Treasury securities    
Securities Available-for-Sale, Amortized Cost    
Less than 12 months 402,678  
Total 402,678  
Held-to-Maturity, Amortized Cost    
Less than 12 months 197,225  
Total 197,225  
Securities Available-for-Sale, Unrealized Loss    
Less than 12 months 1,264  
Total 1,264  
Held-to-Maturity, Unrealized Loss    
Less than 12 months 2,967  
Total 2,967  
Securities Available-for-Sale, Fair Value    
Less than 12 months 401,414  
Total 401,414  
Held-to-Maturity, Fair Value    
Less than 12 months 194,258  
Total 194,258  
Other debt securities    
Securities Available-for-Sale, Amortized Cost    
Less than 12 months 271  
Total 271  
Securities Available-for-Sale, Unrealized Loss    
Less than 12 months 13  
Total 13  
Securities Available-for-Sale, Fair Value    
Less than 12 months 258  
Total $ 258