REGULATORY MATTERS - Schedule of Company's and Bank's Actual Capital Amounts and Ratios (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Leverage Ratio (tier 1 capital to average assets) Actual Amount	$ 2,417,341	$ 2,185,694
Tier 1 Leverage Ratio (tier 1 capital to average assets) Actual Ratio	0.0993	0.0936
Tier 1 Leverage Ratio (tier 1 capital to average assets) For Capital Adequacy Purposes Amount	$ 974,053	$ 933,928
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	$ 2,417,341	$ 2,185,694
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Actual Ratio	11.23%	9.86%
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Adequacy Purposes Amount	$ 1,506,241	$ 1,551,305
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	$ 2,417,341	$ 2,185,694
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) Actual Ratio	0.1123	0.0986
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) For Capital Adequacy Purposes Amount	$ 1,829,007	$ 1,883,727
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	$ 3,110,025	$ 2,859,680
Total Capital Ratio (total capital to risk weighted assets) Actual Ratio	0.1445	0.1290
Total Capital Ratio (total capital to risk weighted assets) For Capital Adequacy Purposes Amount	$ 2,259,362	$ 2,326,957
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	$ 2,600,274	$ 2,464,589
Tier 1 Leverage Ratio (tier 1 capital to average assets) Actual Ratio	0.1069	0.1056
Tier 1 Leverage Ratio (tier 1 capital to average assets) For Capital Adequacy Purposes Amount	$ 973,023	$ 933,284
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	$ 1,216,279	$ 1,166,605
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	$ 2,600,274	$ 2,464,589
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Actual Ratio	12.09%	11.12%
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Adequacy Purposes Amount	$ 1,505,318	$ 1,551,185
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	$ 1,397,795	$ 1,440,386
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	$ 2,600,274	$ 2,464,589
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) Actual Ratio	0.1209	0.1112
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) For Capital Adequacy Purposes Amount	$ 1,827,886	$ 1,883,581
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	$ 1,720,363	$ 1,772,782
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	$ 2,944,480	$ 2,720,253
Total Capital Ratio (total capital to risk weighted assets) Actual Ratio	0.1369	0.1228
Total Capital Ratio (total capital to risk weighted assets) For Capital Adequacy Purposes Amount	$ 2,257,977	$ 2,326,777
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	$ 2,150,454	$ 2,215,978
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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