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FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value By Balance Sheet Location) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets: |  |
Securities—trading | $ 25,268 | $ 28,694
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 2,287,993 | 2,789,031
Securities—held-to-maturity | 853,653 | 942,180
Securities purchased under agreements to resell | 0 | 300,000
Liabilities: |  |
FHLB advances at fair value | 140,000 | 50,000
Subordinated notes, net | 92,748 | 98,947
Reported Value Measurement [Member] |  |
Assets: |  |
Cash and cash equivalents | 251,706 | 243,062
Securities—trading | 25,268 | 28,694
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 2,287,993 | 2,789,031
Securities purchased under agreements to resell | 0 | 300,000
Loans receivable held for sale | 54,158 | 56,857
Loans receivable | 10,464,457 | 10,005,259
Equity securities | 552 | 553
FHLB stock | 15,600 | 12,000
Bank-owned life insurance | 303,347 | 297,565
Mortgage servicing rights | 14,151 | 15,331
SBA servicing asset | 717 | 835
Investments in limited partnerships | 12,841 | 12,427
Liabilities: |  |
Demand, interest checking and money market accounts | 8,964,786 | 10,186,439
Regular savings | 2,751,453 | 2,710,090
Certificates of deposit | 1,458,313 | 723,530
FHLB advances at fair value | 140,000 | 50,000
Other borrowings | 188,440 | 232,799
Junior subordinated debentures at fair value | 66,284 | 74,857
Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Cash and cash equivalents | 251,706 | 243,062
Securities—trading | 25,268 | 28,694
Securities—available-for-sale, net of allowance for credit losses of $750 and none, respectively; amortized cost $2,774,972 and $3,218,777, respectively | 2,287,993 | 2,789,031
Securities purchased under agreements to resell | 0 | 300,000
Loans receivable held for sale | 54,213 | 56,948
Loans receivable | 9,914,151 | 9,810,965
Equity securities | 552 | 553
FHLB stock | 15,600 | 12,000
Bank-owned life insurance | 303,347 | 297,565
Mortgage servicing rights | 36,469 | 35,148
SBA servicing asset | 717 | 835
Investments in limited partnerships | 12,841 | 12,427
Liabilities: |  |
Demand, interest checking and money market accounts | 8,964,786 | 10,186,439
Regular savings | 2,751,453 | 2,710,090
Certificates of deposit | 1,440,378 | 702,581
FHLB advances at fair value | 140,000 | 50,000
Other borrowings | 188,440 | 232,799
Subordinated notes, net | 90,322 | 96,718
Junior subordinated debentures at fair value | 66,284 | 74,857
Interest rate swaps [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 23,809 | 19,339
Liabilities: |  |
Derivatives: | 45,938 | 37,150
Interest rate swaps [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 23,809 | 19,339
Liabilities: |  |
Derivatives: | 45,938 | 37,150
Interest Rate Forward Sales Commitments [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 338 | 142
Liabilities: |  |
Derivatives: | 25 | 118
Interest Rate Forward Sales Commitments [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 338 | 142
Liabilities: |  |
Derivatives: | 25 | 118
Loan Participations and Assignments | Reported Value Measurement [Member] |  |
Liabilities: |  |
Derivatives: | 19 | 67
Loan Participations and Assignments | Estimate of Fair Value Measurement [Member] |  |
Liabilities: |  |
Derivatives: | 19 | 67
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Securities—held-to-maturity | 1,074,574 | 1,109,319
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Securities—held-to-maturity | 846,061 | 933,513
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Securities—held-to-maturity | 7,582 | 8,648
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Securities—held-to-maturity | $ 7,592 | $ 8,667

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