SECURITIES (Securities Debt Maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Amortized Cost
Maturing within one year	$ 0
Maturing after one year through five years	0
Maturing after five years through ten years	0
Maturing after ten years	27,203
Amortized Cost	27,203	$ 27,203
Fair Value
Maturing within one year	0
Maturing after one year through five years	0
Maturing after five years through ten years	0
Maturing after ten years	26,981
Total with Maturity Date	26,981	24,980
Amortized Cost
Maturing in one year or less	14,077
Maturing after one year through five years	165,039
Maturing after five years through ten years	849,194
Maturing after ten years through twenty years	2,624,850
Debt Securities, Available-for-sale, Amortized Cost	3,653,160	2,256,189
Fair Value
Maturing in one year or less	14,174
Maturing after one year through five years	170,104
Maturing after five years through ten years	846,399
Maturing after ten years through twenty years	2,608,316
Securities—available-for-sale	3,638,993	2,322,593
Amortized Cost
Maturing within one year	12,026
Maturing after one year through five years	93,652
Maturing after five years through ten years	22,562
Maturing after ten years	393,115
Debt Securities, Held-to-maturity	521,355	421,807
Fair Value
Maturing within one year	12,087
Maturing after one year through five years	95,299
Maturing after five years through ten years	23,776
Maturing after ten years	410,691
Debt Securities, Held-to-maturity, Fair Value	$ 541,853	$ 448,681