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SECURITIES (Schedule of Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Schedule of Securities [Line Items]            
Debt Securities, Trading, Amortized Cost $ 27,203   $ 27,203      
Securities—trading 28,383   26,981      
Debt Securities, Available-for-sale, Amortized Cost, Total 3,433,541   3,653,160      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 585   36,927      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 437,953   51,094      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0      
Debt Securities, Available-for-sale 2,996,173   3,638,993      
Held-to-maturity Securities, Amortized Cost 1,133,246   521,355      
Held-to-maturity Securities, Gross Unrealized Gains 55   21,917      
Held-to-maturity Securities, Gross Unrealized Losses 185,885   1,419      
Securities—held-to-maturity 947,416   541,853      
Debt Securities, Held-to-maturity, Allowance for Credit Loss 394   (433)      
debt securities, held-to-maturity, accrued interest receivable 4,400   3,300      
Debt Securities, Available-for-Sale, Accrued Interest Receivable 12,500          
U.S. Government and agency obligations            
Schedule of Securities [Line Items]            
Debt Securities, Available-for-sale, Amortized Cost, Total 188,046   201,101      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 108   852      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1,643   621      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0      
Debt Securities, Available-for-sale 186,511   201,332      
Held-to-maturity Securities, Amortized Cost 312   316      
Held-to-maturity Securities, Gross Unrealized Gains 1   3      
Held-to-maturity Securities, Gross Unrealized Losses 7   0      
Securities—held-to-maturity 306   319      
Debt Securities, Held-to-maturity, Allowance for Credit Loss 0 $ 0 0 $ 0 $ 0 $ 0
Municipal bonds            
Schedule of Securities [Line Items]            
Debt Securities, Available-for-sale, Amortized Cost, Total 303,485   293,761      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 14   15,171      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 50,687   320      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0      
Debt Securities, Available-for-sale 252,812   308,612      
Held-to-maturity Securities, Amortized Cost 508,002   420,555      
Held-to-maturity Securities, Gross Unrealized Gains 54   20,743      
Held-to-maturity Securities, Gross Unrealized Losses 90,655   1,393      
Securities—held-to-maturity 417,401   439,905      
Debt Securities, Held-to-maturity, Allowance for Credit Loss 193 196 203 63 64 59
Corporate bonds            
Schedule of Securities [Line Items]            
Debt Securities, Trading, Amortized Cost 27,203   27,203      
Securities—trading 28,383   26,981      
Debt Securities, Available-for-sale, Amortized Cost, Total 133,398   114,427      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0   3,103      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 10,749   183      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0      
Debt Securities, Available-for-sale 122,649   117,347      
Held-to-maturity Securities, Amortized Cost 2,994   3,092      
Held-to-maturity Securities, Gross Unrealized Gains 0   0      
Held-to-maturity Securities, Gross Unrealized Losses 18   3      
Securities—held-to-maturity 2,976   3,089      
Debt Securities, Held-to-maturity, Allowance for Credit Loss 201 228 230 41 46 35
Mortgage-backed or related securities            
Schedule of Securities [Line Items]            
Debt Securities, Available-for-sale, Amortized Cost, Total 2,586,161   2,837,480      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5   17,749      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 372,529   49,961      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0      
Debt Securities, Available-for-sale 2,213,637   2,805,268      
Held-to-maturity Securities, Amortized Cost 621,938   97,392      
Held-to-maturity Securities, Gross Unrealized Gains 0   1,171      
Held-to-maturity Securities, Gross Unrealized Losses 95,205   23      
Securities—held-to-maturity 526,733   98,540      
Debt Securities, Held-to-maturity, Allowance for Credit Loss 0 $ 0 0 $ 0 $ 0 $ 0
Asset-backed securities            
Schedule of Securities [Line Items]            
Debt Securities, Available-for-sale, Amortized Cost, Total 222,451   206,391      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 458   52      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 2,345   9      
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0      
Debt Securities, Available-for-sale $ 220,564   $ 206,434