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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 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financial Assets |  |
Derivative Asset | $ 105,636 | $ 122,132
Financial Liabilities |  |
Derivative Liability | 98,108 | 121,265
Fair Value, Recurring [Member] | Fair Value Hedging [Member] |  |
Financial Liabilities |  |
Derivative Liability | 115 | 6,594
Fair Value, Recurring [Member] | Cash Flow Hedging [Member] |  |
Financial Assets |  |
Derivative Asset | 8,061 | 12,492
Financial Liabilities |  |
Derivative Liability | 418 | 5,031
Fair Value, Recurring [Member] | Freestanding derivatives, net |  |
Financial Assets |  |
Derivative Asset | 97,575 | 114,671
Financial Liabilities |  |
Derivative Liability | 97,575 | 114,671
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value Hedging [Member] |  |
Financial Liabilities |  |
Derivative Liability | 115 | 6,594
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Flow Hedging [Member] |  |
Financial Assets |  |
Derivative Asset | 8,061 | 12,492
Financial Liabilities |  |
Derivative Liability | 418 | 5,031
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Freestanding derivatives, net |  |
Financial Assets |  |
Derivative Asset | 97,575 | 114,671
Financial Liabilities |  |
Derivative Liability | 97,575 | 114,671
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Certain individually evaluated loans |  |
Individually evaluated loans | 854 | 6,336
Reported Value Measurement [Member] |  |
Certain individually evaluated loans |  |
Individually evaluated loans | 10,805,969 | 10,695,349
Reported Value Measurement [Member] | Fair Value, Nonrecurring [Member] |  |
Certain individually evaluated loans |  |
Individually evaluated loans | 854 | 6,336
Agency notes | Fair Value, Recurring [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 9,689 | 9,371
Agency notes | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 9,689 | 9,371
Treasury securities | Fair Value, Recurring [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 161,371 | 234,190
Treasury securities | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 161,371 | 234,190
Corporate securities | Fair Value, Recurring [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 160,629 | 151,170
Corporate securities | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 160,629 | 151,170
Pass-through MBS issued by GSEs | Fair Value, Recurring [Member] |  |
Financial Assets |  |
Mortgage-backed securities | 179,336 | 205,285
Pass-through MBS issued by GSEs | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets |  |
Mortgage-backed securities | 179,336 | 205,285
Agency CMOs | Fair Value, Recurring [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 237,773 | 259,415
Agency CMOs | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 237,773 | 259,415
State and municipal obligations | Fair Value, Recurring [Member] |  |
Financial Assets |  |
Securities available-for-sale: | 25,810 | 26,809
State and municipal obligations | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial Assets |  |
Securities available-for-sale: | $ 25,810 | $ 26,809

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