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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, 2023 | Dec. 31, 2022
--- | --- | ---
Financial Assets |  |
Derivative assets | $ 177,369 | $ 154,485
Financial Liabilities |  |
Derivative liabilities | 160,712 | 137,335
Recurring | Cash flow hedges |  |
Financial Assets |  |
Derivative assets | 16,657 | 17,150
Recurring | Freestanding derivatives, net |  |
Financial Assets |  |
Derivative assets | 160,712 | 137,335
Financial Liabilities |  |
Derivative liabilities | 160,712 | 137,335
Recurring | Level 2 Inputs | Cash flow hedges |  |
Financial Assets |  |
Derivative assets | 16,657 | 17,150
Recurring | Level 2 Inputs | Freestanding derivatives, net |  |
Financial Assets |  |
Derivative assets | 160,712 | 137,335
Financial Liabilities |  |
Derivative liabilities | 160,712 | 137,335
Nonrecurring | Level 3 Inputs |  |
Certain individually evaluated loans |  |
Individually evaluated loans | 352 | 1,179
Carrying Amount |  |
Certain individually evaluated loans |  |
Individually evaluated loans | 10,777,696 | 10,482,145
Carrying Amount | Nonrecurring |  |
Certain individually evaluated loans |  |
Individually evaluated loans | 352 | 1,179
US Government Agencies Debt Securities [Member] | Recurring |  |
Financial Assets |  |
Securities available-for-sale: | 9,143 |
US Government Agencies Debt Securities [Member] | Recurring | Level 2 Inputs |  |
Financial Assets |  |
Securities available-for-sale: | 9,143 |
US Treasury Securities [Member] | Recurring |  |
Financial Assets |  |
Securities available-for-sale: | 229,873 | 227,256
US Treasury Securities [Member] | Recurring | Level 2 Inputs |  |
Financial Assets |  |
Securities available-for-sale: | 229,873 | 227,256
Corporate securities | Recurring |  |
Financial Assets |  |
Securities available-for-sale: | 141,087 | 166,773
Corporate securities | Recurring | Level 2 Inputs |  |
Financial Assets |  |
Securities available-for-sale: | 141,087 | 166,773
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs") | Recurring |  |
Financial Assets |  |
Mortgage-backed securities | 206,203 | 241,240
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs") | Recurring | Level 2 Inputs |  |
Financial Assets |  |
Mortgage-backed securities | 206,203 | 241,240
Agency collateralized mortgage obligations ("CMOs") | Recurring |  |
Financial Assets |  |
Securities available-for-sale: | 255,642 | 281,339
Agency collateralized mortgage obligations ("CMOs") | Recurring | Level 2 Inputs |  |
Financial Assets |  |
Securities available-for-sale: | 255,642 | 281,339
State and municipal obligations. | Recurring |  |
Financial Assets |  |
Securities available-for-sale: | 27,931 | 33,979
State and municipal obligations. | Recurring | Level 2 Inputs |  |
Financial Assets |  |
Securities available-for-sale: | $ 27,931 | $ 33,979

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