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FAIR VALUE OF FINANCIAL INSTRUMENTS (Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Reported Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other borrowings | $ 182,877 | $ 232,799
Reported Value Measurement [Member] | Interest Rate Contract [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 275 | 142
Derivative liabilities | 185 | 118
Reported Value Measurement [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and Cash Equivalents, Fair Value Disclosure | 254,464 | 243,062
Equity Securities, FV-NI | 449 | 553
Bank-owned life insurance | 304,366 | 297,565
Reported Value Measurement [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale | 2,348,479 | 2,789,031
Debt Securities, Held-to-maturity, Fair Value | 1,052,028 | 1,109,319
Securities purchased under agreements to resell | 0 | 300,000
Loans receivable held for sale | 11,170 | 56,857
Deposits, Demand NOW and Money Market Accounts, Fair Value Disclosure | 8,571,500 | 10,186,439
Deposits, Savings, Fair Value Disclosure | 2,980,530 | 2,710,090
Deposits, Certificates of Deposit, Fair Value Disclosure | 1,477,467 | 723,530
Advances from FHLB | 323,000 | 50,000
Subordinated notes, net |  | 98,947
Reported Value Measurement [Member] | Level 2 [Member] | Interest Rate Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 15,129 | 19,339
Derivative liabilities | 29,809 | 37,150
Reported Value Measurement [Member] | Level 2 [Member] | Loan Participations and Assignments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities | 42 | 67
Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading Securities, Fair Value | 0 | 28,694
Securities—available-for-sale | 25,304 | 0
Debt Securities, Held-to-maturity, Fair Value | 7,027 | 8,648
Loans receivable | 10,660,812 | 10,005,259
FHLB stock | 24,028 | 12,000
MSRs | 13,909 | 15,331
SBA servicing asset | 740 | 835
Investments in limited partnerships | 13,475 | 12,427
Junior subordinated debentures net of unamortized deferred issuance costs at fair value | 66,413 | 74,857
Estimate of Fair Value Measurement [Member] | Interest Rate Contract [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 275 | 142
Derivative liabilities | 185 | 118
Estimate of Fair Value Measurement [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and Cash Equivalents, Fair Value Disclosure | 254,464 | 243,062
Equity Securities, FV-NI | 449 | 553
Bank-owned life insurance | 304,366 | 297,565
Estimate of Fair Value Measurement [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities—available-for-sale | 2,348,479 | 2,789,031
Debt Securities, Held-to-maturity, Fair Value | 900,522 | 933,513
Securities purchased under agreements to resell | 0 | 300,000
Loans receivable held for sale | 11,219 | 56,948
Deposits, Demand NOW and Money Market Accounts, Fair Value Disclosure | 8,571,500 | 10,186,439
Deposits, Savings, Fair Value Disclosure | 2,980,530 | 2,710,090
Deposits, Certificates of Deposit, Fair Value Disclosure | 1,465,612 | 702,581
Advances from FHLB | 323,000 | 50,000
Other borrowings | 182,877 | 232,799
Subordinated notes, net | 85,536 | 96,718
Estimate of Fair Value Measurement [Member] | Level 2 [Member] | Interest Rate Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 15,129 | 19,339
Derivative liabilities | 29,809 | 37,150
Estimate of Fair Value Measurement [Member] | Level 2 [Member] | Loan Participations and Assignments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities | 42 | 67
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading Securities, Fair Value | 0 | 28,694
Securities—available-for-sale | 25,304 | 0
Debt Securities, Held-to-maturity, Fair Value | 6,992 | 8,667
Loans receivable | 10,250,271 | 9,810,965
FHLB stock | 24,028 | 12,000
MSRs | 35,794 | 35,148
SBA servicing asset | 740 | 835
Investments in limited partnerships | 13,475 | 12,427
Junior subordinated debentures net of unamortized deferred issuance costs at fair value | 66,413 | 74,857
Trading Securities, Fair Value | 0 | 28,694
Securities—available-for-sale | 2,373,783 | 2,789,031
Debt Securities, Held-to-maturity, Fair Value | 907,514 | 942,180
Securities purchased under agreements to resell | 0 | 300,000
Loans receivable held for sale | 9,105 | 51,779
Advances from FHLB | 323,000 | $ 50,000
Subordinated notes, net | $ 92,851 |

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