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FAIR VALUE OF FINANCIAL INSTRUMENTS - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financial Assets |  |
Derivative Asset | $ 134,489 | $ 122,132
Financial Liabilities |  |
Derivative Liability | 122,567 | 121,265
Fair Value, Recurring [Member] | Fair Value Hedging [Member] |  |
Financial Liabilities |  |
Derivative Liability | 400 | 6,594
Fair Value, Recurring [Member] | Cash Flow Hedging [Member] |  |
Financial Assets |  |
Derivative Asset | 12,134 | 12,492
Financial Liabilities |  |
Derivative Liability | 701 | 5,031
Fair Value, Recurring [Member] | Freestanding derivatives, net |  |
Financial Assets |  |
Derivative Asset | 122,401 | 114,671
Financial Liabilities |  |
Derivative Liability | 122,401 | 114,671
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value Hedging [Member] |  |
Financial Liabilities |  |
Derivative Liability | 400 | 6,594
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Flow Hedging [Member] |  |
Financial Assets |  |
Derivative Asset | 12,134 | 12,492
Financial Liabilities |  |
Derivative Liability | 701 | 5,031
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Freestanding derivatives, net |  |
Financial Assets |  |
Derivative Asset | 122,401 | 114,671
Financial Liabilities |  |
Derivative Liability | 122,401 | 114,671
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Certain individually evaluated loans |  |
Individually evaluated loans | 823 | 6,336
Reported Value Measurement [Member] |  |
Certain individually evaluated loans |  |
Individually evaluated loans | 10,746,223 | 10,695,349
Reported Value Measurement [Member] | Fair Value, Nonrecurring [Member] |  |
Certain individually evaluated loans |  |
Individually evaluated loans | 823 | 6,336
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 9,432 | 9,371
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 9,432 | 9,371
US Treasury Securities [Member] | Fair Value, Recurring [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 197,912 | 234,190
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 197,912 | 234,190
Corporate securities | Fair Value, Recurring [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 155,410 | 151,170
Corporate securities | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 155,410 | 151,170
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Recurring [Member] |  |
Financial Assets |  |
Mortgage-backed securities | 187,044 | 205,285
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets |  |
Mortgage-backed securities | 187,044 | 205,285
Collateralized Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 243,846 | 259,415
Collateralized Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 243,846 | 259,415
Debt Security, Corporate, US [Member] | Fair Value, Recurring [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 25,578 | 26,809
Debt Security, Corporate, US [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets |  |
Securities available-for-sale: | $ 25,578 | $ 26,809

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