REGULATORY CAPITAL REQUIREMENTS (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Company (consolidated) [Member]
Total capital (to risk weighted assets):
Actual	$ 2,268,863	$ 2,311,824
Actual Ratio	0.1591	0.1611
Capital Required for Capital Adequacy	$ 1,140,554	$ 1,148,328
For Capital Adequacy Purposes Ratio	0.080	0.080
Common Equity Tier One Capital	$ 2,022,873	$ 2,057,099
Common Equity tier One Capital to Risk Weighted Assets	14.19%	14.33%
Common Equity Tier One Capital Required for Capital Adequacy	$ 641,562	$ 645,935
Common Equity Tier One Capital for Capitalized Adequacy to Risk Weighted Assets	4.50%	4.50%
Tier 1 capital (to risk weighted assets):
Actual	$ 2,022,873	$ 2,057,099
Actual Ratio	0.1419	0.1433
For Capital Adequacy Purposes	$ 855,416	$ 861,246
For Capital Adequacy Purposes Ratio	0.060	0.060
Tier 1 capital (to average assets):
Actual	$ 2,022,873	$ 2,057,099
Actual Ratio	0.1096	0.1099
For Capital Adequacy Purposes	$ 737,984	$ 748,775
For Capital Adequacy Purposes Ratio	0.040	0.040
Bank [Member]
Total capital (to risk weighted assets):
Actual	$ 2,183,436	$ 2,162,752
Actual Ratio	0.1532	0.1507
Capital Required for Capital Adequacy	$ 1,140,550	$ 1,148,329
For Capital Adequacy Purposes Ratio	0.080	0.080
To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 1,425,687	$ 1,435,411
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	0.100	0.100
Common Equity Tier One Capital	$ 2,048,426	$ 2,018,912
Common Equity tier One Capital to Risk Weighted Assets	14.37%	14.07%
Common Equity Tier One Capital Required for Capital Adequacy	$ 641,559	$ 645,935
Common Equity Tier One Capital for Capitalized Adequacy to Risk Weighted Assets	4.50%	4.50%
Common Equity Tier 1 Capital to be Well Capitalized	$ 926,696	$ 933,017
Common Equity Tier One Capital to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%
Tier 1 capital (to risk weighted assets):
Actual	$ 2,048,426	$ 2,018,912
Actual Ratio	0.1437	0.1407
For Capital Adequacy Purposes	$ 855,412	$ 861,247
For Capital Adequacy Purposes Ratio	0.060	0.060
To Be Well Capitalized Under Prompt Corrective Action Provisions	$ 1,140,550	$ 1,148,329
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	0.080	0.080
Tier 1 capital (to average assets):
Actual	$ 2,048,426	$ 2,018,912
Actual Ratio	0.1110	0.1078
For Capital Adequacy Purposes	$ 738,055	$ 748,828
For Capital Adequacy Purposes Ratio	0.040	0.040
To Be Well Capitalized Under Prompt Correction Action Provisions	$ 922,568	$ 936,036
To Be Well Capitalized Under Prompt Correction Action Provisions Ratio	0.050	0.050