SECURITIES (Schedule of Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]
Amortized Cost		$ 27,203
Fair Value		28,694
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	$ 2,729,980	3,218,777
Gross Unrealized Gains	2,074	1,463
Gross Unrealized Losses	(358,271)	(431,209)
Allowance for Credit Losses	0	0
Securities—available-for-sale	2,373,783	2,789,031
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	1,059,387	1,117,967
Gross Unrealized Gains	687	109
Gross Unrealized Losses	(152,228)	(175,896)
Debt Securities, Held-to-maturity, Fair Value	907,514	942,180
Debt Securities, Held-to-Maturity, Allowance for Credit Loss	(332)	(379)	$ (433)	$ (94)
U.S. Government and agency obligations
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	34,929	56,344
Gross Unrealized Gains	0	8
Gross Unrealized Losses	(740)	(1,244)
Allowance for Credit Losses	0	0
Securities—available-for-sale	34,189	55,108
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	307	312
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(5)	(7)
Debt Securities, Held-to-maturity, Fair Value	302	305
Debt Securities, Held-to-Maturity, Allowance for Credit Loss	0	0	0	0
Municipal bonds
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	161,264	301,449
Gross Unrealized Gains	832	530
Gross Unrealized Losses	(29,191)	(40,770)
Allowance for Credit Losses	0	0
Securities—available-for-sale	132,905	261,209
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	466,032	503,117
Gross Unrealized Gains	687	109
Gross Unrealized Losses	(53,563)	(70,907)
Debt Securities, Held-to-maturity, Fair Value	412,999	432,319
Debt Securities, Held-to-Maturity, Allowance for Credit Loss	(157)	(183)	(203)	(59)
Corporate bonds
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]
Amortized Cost		27,203
Fair Value		28,694
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	131,291	133,334
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(12,168)	(11,481)
Allowance for Credit Losses	0	0
Securities—available-for-sale	119,123	121,853
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	2,781	2,961
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(20)	(16)
Debt Securities, Held-to-maturity, Fair Value	2,586	2,945
Debt Securities, Held-to-Maturity, Allowance for Credit Loss	(175)	(196)	(230)	(35)
Mortgage-backed or related securities
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	2,179,947	2,505,172
Gross Unrealized Gains	942	885
Gross Unrealized Losses	(314,175)	(366,721)
Allowance for Credit Losses	0	0
Securities—available-for-sale	1,866,714	2,139,336
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract]
Amortized Cost	590,267	611,577
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(98,640)	(104,966)
Debt Securities, Held-to-maturity, Fair Value	491,627	506,611
Debt Securities, Held-to-Maturity, Allowance for Credit Loss	0	0	$ 0	$ 0
Asset-backed securities
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	222,549	222,478
Gross Unrealized Gains	300	40
Gross Unrealized Losses	(1,997)	(10,993)
Allowance for Credit Losses	0	0
Securities—available-for-sale	$ 220,852	$ 211,525