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SECURITIES (Schedule of Securities) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Schedule of Securities [Line Items]        
Securities—trading, Amortized Cost $ 27,203,000 $ 27,203,000    
Securities—trading 25,039,000 24,980,000    
Available-for-sale Securities, Amortized Cost 2,996,902,000 2,256,189,000    
Available-for-sale Securities, Gross Unrealized Gains 46,118,000 68,543,000    
Available-for-sale Securities, Gross Unrealized Losses (53,260,000) (2,139,000)    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 0 0    
Securities—available-for-sale 2,989,760,000 2,322,593,000    
Held-to-maturity Securities, Amortized Cost 441,955,000 421,807,000    
Held-to-maturity Securities, Gross Unrealized Gains 19,414,000 26,980,000    
Held-to-maturity Securities, Gross Unrealized Losses 1,774,000 106,000    
Securities—held-to-maturity 459,595,000 448,681,000    
Debt Securities, Held-to-maturity, Allowance for Credit Loss 98,000 (94,000)    
debt securities, held-to-maturity, accrued interest receivable 2,700,000 3,000,000.0    
Debt Securities, Available-for-Sale, Accrued Interest Receivable 8,200,000 6,900,000    
Trading Securities, Unrealized Holding Gain 59,000      
U.S. Government and agency obligations        
Schedule of Securities [Line Items]        
Available-for-sale Securities, Amortized Cost 62,922,000 141,668,000    
Available-for-sale Securities, Gross Unrealized Gains 740,000 1,002,000    
Available-for-sale Securities, Gross Unrealized Losses (816,000) (935,000)    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 0 0    
Securities—available-for-sale 62,846,000 141,735,000    
Held-to-maturity Securities, Amortized Cost 339,000 340,000    
Held-to-maturity Securities, Gross Unrealized Gains 6,000 7,000    
Held-to-maturity Securities, Gross Unrealized Losses 0 0    
Securities—held-to-maturity 345,000 347,000    
Debt Securities, Held-to-maturity, Allowance for Credit Loss 0 0 $ 0 $ 0
Municipal bonds        
Schedule of Securities [Line Items]        
Available-for-sale Securities, Amortized Cost 287,685,000 283,997,000    
Available-for-sale Securities, Gross Unrealized Gains 14,378,000 19,523,000    
Available-for-sale Securities, Gross Unrealized Losses (1,328,000) (2,000)    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 0 0    
Securities—available-for-sale 300,735,000 303,518,000    
Held-to-maturity Securities, Amortized Cost 381,136,000 370,998,000    
Held-to-maturity Securities, Gross Unrealized Gains 17,740,000 24,130,000    
Held-to-maturity Securities, Gross Unrealized Losses 1,481,000 94,000    
Securities—held-to-maturity 397,395,000 395,034,000    
Debt Securities, Held-to-maturity, Allowance for Credit Loss 61,000 59,000 61,000 0
Corporate bonds        
Schedule of Securities [Line Items]        
Securities—trading, Amortized Cost 27,203,000 27,203,000    
Securities—trading 25,039,000 24,980,000    
Available-for-sale Securities, Amortized Cost 243,428,000 219,086,000    
Available-for-sale Securities, Gross Unrealized Gains 2,290,000 2,762,000    
Available-for-sale Securities, Gross Unrealized Losses (290,000) (79,000)    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 0 0    
Securities—available-for-sale 245,428,000 221,769,000    
Held-to-maturity Securities, Amortized Cost 3,190,000 3,222,000    
Held-to-maturity Securities, Gross Unrealized Gains 0 0    
Held-to-maturity Securities, Gross Unrealized Losses 7,000 12,000    
Securities—held-to-maturity 3,183,000 3,210,000    
Debt Securities, Held-to-maturity, Allowance for Credit Loss 37,000 35,000 37,000 0
Mortgage-backed or related securities        
Schedule of Securities [Line Items]        
Available-for-sale Securities, Amortized Cost 2,399,117,000 1,602,033,000    
Available-for-sale Securities, Gross Unrealized Gains 28,710,000 45,179,000    
Available-for-sale Securities, Gross Unrealized Losses (50,824,000) (1,060,000)    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 0 0    
Securities—available-for-sale 2,377,003,000 1,646,152,000    
Held-to-maturity Securities, Amortized Cost 57,290,000 47,247,000    
Held-to-maturity Securities, Gross Unrealized Gains 1,668,000 2,843,000    
Held-to-maturity Securities, Gross Unrealized Losses 286,000 0    
Securities—held-to-maturity 58,672,000 50,090,000    
Debt Securities, Held-to-maturity, Allowance for Credit Loss 0 0 $ 0 $ 0
Asset-backed securities        
Schedule of Securities [Line Items]        
Available-for-sale Securities, Amortized Cost 3,750,000 9,405,000    
Available-for-sale Securities, Gross Unrealized Gains 0 77,000    
Available-for-sale Securities, Gross Unrealized Losses (2,000) (63,000)    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 0 0    
Securities—available-for-sale $ 3,748,000 $ 9,419,000