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REGULATORY CAPITAL REQUIREMENTS (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Company (consolidated) [Member]    
Total capital (to risk weighted assets):    
Actual $ 2,311,824 $ 2,262,740
Actual Ratio 0.1611 0.1604
Capital Required for Capital Adequacy $ 1,148,328 $ 1,128,900
For Capital Adequacy Purposes Ratio 0.080 0.080
Common Equity Tier One Capital $ 2,057,099 $ 2,017,497
Common Equity tier One Capital to Risk Weighted Assets 14.33% 14.30%
Common Equity Tier One Capital Required for Capital Adequacy $ 645,935 $ 635,006
Common Equity Tier One Capital for Capitalized Adequacy to Risk Weighted Assets 4.50% 4.50%
Tier 1 capital (to risk weighted assets):    
Actual $ 2,057,099 $ 2,017,497
Actual Ratio 0.1433 0.1430
For Capital Adequacy Purposes $ 861,246 $ 846,675
For Capital Adequacy Purposes Ratio 0.060 0.060
Tier 1 capital (to average assets):    
Actual $ 2,057,099 $ 2,017,497
Actual Ratio 0.1099 0.1203
For Capital Adequacy Purposes $ 748,775 $ 670,659
For Capital Adequacy Purposes Ratio 0.040 0.040
Bank [Member]    
Total capital (to risk weighted assets):    
Actual $ 2,162,752 $ 2,083,689
Actual Ratio 0.1507 0.1477
Capital Required for Capital Adequacy $ 1,148,329 $ 1,128,536
For Capital Adequacy Purposes Ratio 0.080 0.080
To Be Well Capitalized Under Prompt Corrective Action Provisions $ 1,435,411 $ 1,410,670
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 0.100 0.100
Common Equity Tier One Capital $ 2,018,912 $ 1,949,237
Common Equity tier One Capital to Risk Weighted Assets 14.07% 13.82%
Common Equity Tier One Capital Required for Capital Adequacy $ 645,935 $ 634,801
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 $ 933,017 $ 916,935
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 $ 2,018,912 $ 1,949,237
Actual Ratio 0.1407 0.1382
For Capital Adequacy Purposes $ 861,247 $ 846,402
For Capital Adequacy Purposes Ratio 0.060 0.060
To Be Well Capitalized Under Prompt Corrective Action Provisions $ 1,148,329 $ 1,128,536
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 0.080 0.080
Tier 1 capital (to average assets):    
Actual $ 2,018,912 $ 1,949,237
Actual Ratio 0.1078 0.1162
For Capital Adequacy Purposes $ 748,828 $ 670,827
For Capital Adequacy Purposes Ratio 0.040 0.040
To Be Well Capitalized Under Prompt Correction Action Provisions $ 936,036 $ 838,534
To Be Well Capitalized Under Prompt Correction Action Provisions Ratio 0.050 0.050