SECURITIES (Reconciliation of amortized cost of held to maturity securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	$ 1,569,107	$ 1,705,120
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	559	729
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(152,058)	(181,139)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Fair Value	1,417,608	1,524,710
US Government Agencies Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	29,521	31,258
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(1,113)	(2,222)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Fair Value	28,408	29,036
US Treasury Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	100,712	100,634
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(9,177)	(11,755)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Fair Value	91,535	88,879
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	829,431	898,927
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	175	408
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(65,878)	(83,383)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Fair Value	763,728	815,952
Agency collateralized mortgage obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	477,517	535,971
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(69,606)	(77,554)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Fair Value	407,911	458,417
Single issuer trust preferred securities issued by banks [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	1,500	1,500
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	8
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(127)	0
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Fair Value	1,373	1,508
Small Business Administration Pooled Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	130,426	136,830
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	384	313
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(6,157)	(6,225)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Fair Value	$ 124,653	$ 130,918