REGULATORY MATTERS - Schedule of Company's and Bank's Actual Capital Amounts and Ratios (Details) $ in Thousands	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
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

Common Equity Tier 1 Risk Based Capital as defined in the regulations.

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Common equity tier one risk based capital required for capital adequacy to risk weighted assets.

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Common Equity Tier 1 capital divided by risk weighted assets as defined by regulations.

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Tier One Risk Based Capital Required For Capital Adequacy, With Buffer

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Amount of total capital as defined by regulatory framework.

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Amount of minimum total risk-based capital required for capital adequacy as defined by regulatory framework.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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