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INVESTMENT SECURITIES (Unrealized Gains and Losses by Category) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Securities Available-for-Sale, Amortized Cost    
12 months or more $ 171,011  
Less than 12 months 1,323,800 $ 98,962
Total 1,494,811  
Held-to-Maturity, Amortized Cost    
Less than 12 months 197,635  
Total 535,070  
Securities Available-for-Sale, Unrealized Loss    
12 months or more 33,027  
Less than 12 months 78,004 3,400
Total 111,031  
Held-to-Maturity, Unrealized Loss    
Less than 12 months 3,526  
Total 65,884  
Securities Available-for-Sale, Fair Value    
12 months or more 137,984 0
Less than 12 months 1,245,796 95,562
Total 1,383,780  
Held-to-Maturity, Fair Value    
Less than 12 months 194,109  
Total 469,186  
CMOs issued by US Government-sponsored agencies    
Securities Available-for-Sale, Amortized Cost    
12 months or more 337  
Less than 12 months 15,297 500
Total 15,634  
Securities Available-for-Sale, Unrealized Loss    
12 months or more 7  
Less than 12 months 776 1
Total 783  
Securities Available-for-Sale, Fair Value    
12 months or more 330  
Less than 12 months 14,521 499
Total 14,851  
FNMA and FHLMC certificates    
Securities Available-for-Sale, Amortized Cost    
12 months or more 88,600  
Less than 12 months 745,566 93,440
Total 834,166  
Held-to-Maturity, Amortized Cost    
12 months or more 337,435  
Less than 12 months 0 367,507
Total 337,435  
Securities Available-for-Sale, Unrealized Loss    
12 months or more 18,989  
Less than 12 months 50,657 3,200
Total 69,646  
Held-to-Maturity, Unrealized Loss    
12 months or more 62,358  
Less than 12 months 0 3,854
Total 62,358  
Securities Available-for-Sale, Fair Value    
12 months or more 69,611  
Less than 12 months 694,909 90,240
Total 764,520  
Held-to-Maturity, Fair Value    
12 months or more 275,077  
Less than 12 months 0 363,653
Total 275,077  
GNMA Securities    
Securities Available-for-Sale, Amortized Cost    
12 months or more 82,074  
Less than 12 months 251,835 5,022
Total 333,909  
Securities Available-for-Sale, Unrealized Loss    
12 months or more 14,031  
Less than 12 months 24,838 199
Total 38,869  
Securities Available-for-Sale, Fair Value    
12 months or more 68,043  
Less than 12 months 226,997 $ 4,823
Total 295,040  
US Treasury securities    
Securities Available-for-Sale, Amortized Cost    
Less than 12 months 310,862  
Total 310,862  
Held-to-Maturity, Amortized Cost    
Less than 12 months 197,635  
Total 197,635  
Securities Available-for-Sale, Unrealized Loss    
Less than 12 months 1,729  
Total 1,729  
Held-to-Maturity, Unrealized Loss    
Less than 12 months 3,526  
Total 3,526  
Securities Available-for-Sale, Fair Value    
Less than 12 months 309,133  
Total 309,133  
Held-to-Maturity, Fair Value    
Less than 12 months 194,109  
Total 194,109  
Other debt securities    
Securities Available-for-Sale, Amortized Cost    
Less than 12 months 240  
Total 240  
Securities Available-for-Sale, Unrealized Loss    
Less than 12 months 4  
Total 4  
Securities Available-for-Sale, Fair Value    
Less than 12 months 236  
Total $ 236