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REGULATORY MATTERS - Schedule of Company's and Bank's Actual Capital Amounts and Ratios (Details) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Company |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 Leverage Ratio (tier 1 capital to average assets) Actual Amount | $ 2,729,727 | $ 2,417,341
Tier 1 Leverage Ratio (tier 1 capital to average assets) Actual Ratio | 0.1074 | 0.0993
Tier 1 Leverage Ratio (tier 1 capital to average assets) For Capital Adequacy Purposes Amount | $ 1,016,543 | $ 974,053
Tier 1 Leverage Ratio (tier 1 capital to average assets) For Capital Adequacy Purposes Ratio | 0.0400 | 0.0400
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Actual Amount | $ 2,729,727 | $ 2,417,341
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Actual Ratio | 12.65% | 11.23%
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Adequacy Purposes Amount | $ 1,510,315 | $ 1,506,241
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Adequacy Purposes Ratio | 7.00% | 7.00%
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) Actual Amount | $ 2,729,727 | $ 2,417,341
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) Actual Ratio | 0.1265 | 0.1123
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) For Capital Adequacy Purposes Amount | $ 1,833,954 | $ 1,829,007
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) For Capital Adequacy Purposes Ratio | 0.0850 | 0.0850
Total Capital Ratio (total capital to risk weighted assets) Actual Amount | $ 3,316,661 | $ 3,110,025
Total Capital Ratio (total capital to risk weighted assets) Actual Ratio | 0.1537 | 0.1445
Total Capital Ratio (total capital to risk weighted assets) For Capital Adequacy Purposes Amount | $ 2,265,473 | $ 2,259,362
Total Capital Ratio (total capital to risk weighted assets) For Capital Adequacy Purposes Ratio | 0.1050 | 0.1050
Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier 1 Leverage Ratio (tier 1 capital to average assets) Actual Amount | $ 2,834,667 | $ 2,600,274
Tier 1 Leverage Ratio (tier 1 capital to average assets) Actual Ratio | 0.1117 | 0.1069
Tier 1 Leverage Ratio (tier 1 capital to average assets) For Capital Adequacy Purposes Amount | $ 1,015,484 | $ 973,023
Tier 1 Leverage Ratio (tier 1 capital to average assets) For Capital Adequacy Purposes Ratio | 0.0400 | 0.0400
Tier 1 Leverage Ratio (tier 1 capital to average assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 1,269,354 | $ 1,216,279
Tier 1 Leverage Ratio (tier 1 capital to average assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 0.0500 | 0.0500
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Actual Amount | $ 2,834,667 | $ 2,600,274
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Actual Ratio | 13.15% | 12.09%
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Adequacy Purposes Amount | $ 1,509,040 | $ 1,505,318
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Adequacy Purposes Ratio | 7.00% | 7.00%
CET1 Ratio (common equity tier 1 capital to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 1,401,251 | $ 1,397,795
CET1 Ratio (common equity tier 1 capital to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 6.50% | 6.50%
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) Actual Amount | $ 2,834,667 | $ 2,600,274
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) Actual Ratio | 0.1315 | 0.1209
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) For Capital Adequacy Purposes Amount | $ 1,832,406 | $ 1,827,886
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) For Capital Adequacy Purposes Ratio | 0.0850 | 0.0850
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 1,724,617 | $ 1,720,363
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 0.0800 | 0.0800
Total Capital Ratio (total capital to risk weighted assets) Actual Amount | $ 3,179,067 | $ 2,944,480
Total Capital Ratio (total capital to risk weighted assets) Actual Ratio | 0.1475 | 0.1369
Total Capital Ratio (total capital to risk weighted assets) For Capital Adequacy Purposes Amount | $ 2,263,560 | $ 2,257,977
Total Capital Ratio (total capital to risk weighted assets) For Capital Adequacy Purposes Ratio | 0.1050 | 0.1050
Total Capital Ratio (total capital to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 2,155,771 | $ 2,150,454
Total Capital Ratio (total capital to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 0.1000 | 0.1000

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