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SECURITIES (Schedule of Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Schedule of Securities [Line Items]    
Debt Securities, Trading, Amortized Cost $ 27,203 $ 27,203
Securities—trading 28,591 28,694
Debt Securities, Available-for-sale, Amortized Cost, Total 3,040,211 3,218,777
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,408 1,463
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 388,759 431,209
Debt Securities, Available-for-Sale 2,653,860 2,789,031
Held-to-maturity Securities, Amortized Cost 1,109,959 1,117,967
Held-to-maturity Securities, Gross Unrealized Gains 359 109
Held-to-maturity Securities, Gross Unrealized Losses 153,256 175,896
Securities—held-to-maturity 957,062 942,180
Debt Securities, Held-to-maturity, Allowance for Credit Loss 364 (379)
debt securities, held-to-maturity, accrued interest receivable 4,400 4,800
Debt Securities, Available-for-Sale, Accrued Interest Receivable 11,900 12,400
U.S. Government and agency obligations    
Schedule of Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost, Total 53,689 56,344
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 10 8
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1,111 1,244
Debt Securities, Available-for-Sale 52,588 55,108
Held-to-maturity Securities, Amortized Cost 310 312
Held-to-maturity Securities, Gross Unrealized Gains 1 0
Held-to-maturity Securities, Gross Unrealized Losses 5 7
Securities—held-to-maturity 306 305
Debt Securities, Held-to-maturity, Allowance for Credit Loss 0 0
Municipal bonds    
Schedule of Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost, Total 205,152 301,449
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 482 530
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 31,913 40,770
Debt Securities, Available-for-Sale 173,721 261,209
Held-to-maturity Securities, Amortized Cost 501,361 503,117
Held-to-maturity Securities, Gross Unrealized Gains 358 109
Held-to-maturity Securities, Gross Unrealized Losses 59,063 70,907
Securities—held-to-maturity 442,656 432,319
Debt Securities, Held-to-maturity, Allowance for Credit Loss 173 183
Corporate bonds    
Schedule of Securities [Line Items]    
Debt Securities, Trading, Amortized Cost 27,203 27,203
Securities—trading 28,591 28,694
Debt Securities, Available-for-sale, Amortized Cost, Total 133,269 133,334
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 15,865 11,481
Debt Securities, Available-for-Sale 117,404 121,853
Held-to-maturity Securities, Amortized Cost 2,929 2,961
Held-to-maturity Securities, Gross Unrealized Gains 0 0
Held-to-maturity Securities, Gross Unrealized Losses 19 16
Securities—held-to-maturity 2,910 2,945
Debt Securities, Held-to-maturity, Allowance for Credit Loss 191 196
Mortgage-backed or related securities    
Schedule of Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost, Total 2,425,602 2,505,172
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,647 885
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 335,040 366,721
Debt Securities, Available-for-Sale 2,092,209 2,139,336
Held-to-maturity Securities, Amortized Cost 605,359 611,577
Held-to-maturity Securities, Gross Unrealized Gains 0 0
Held-to-maturity Securities, Gross Unrealized Losses 94,169 104,966
Securities—held-to-maturity 511,190 506,611
Debt Securities, Held-to-maturity, Allowance for Credit Loss 0 0
Asset-backed securities    
Schedule of Securities [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost, Total 222,499 222,478
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 269 40
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 4,830 10,993
Debt Securities, Available-for-Sale $ 217,938 $ 211,525