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FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value By Balance Sheet Location) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Reported Value Measurement [Member] |  |
Assets: |  |
Cash and cash equivalents | $ 478,795 | $ 254,464
Loans receivable held for sale | 78,841 | 11,170
Loans receivable | 11,070,021 | 10,660,812
Equity securities | 443 | 449
FHLB stock | 19,751 | 24,028
Bank-owned life insurance | 310,400 | 304,366
Mortgage servicing rights | 12,813 | 13,909
SBA servicing asset | 790 | 740
Investments in limited partnerships | 13,582 | 13,475
Liabilities: |  |
Demand, interest checking and money market accounts | 8,676,436 | 8,571,500
Regular savings | 3,339,859 | 2,980,530
Certificates of deposit | 1,521,853 | 1,477,467
FHLB advances at fair value | 230,000 | 323,000
Other borrowings | 154,533 | 182,877
Junior subordinated debentures at fair value | 66,257 | 66,413
Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Cash and cash equivalents | 478,795 | 254,464
Loans receivable held for sale | 80,097 | 11,219
Loans receivable | 10,845,004 | 10,250,271
Equity securities | 443 | 449
FHLB stock | 19,751 | 24,028
Bank-owned life insurance | 310,400 | 304,366
Mortgage servicing rights | 35,069 | 35,794
SBA servicing asset | 790 | 740
Investments in limited partnerships | 13,582 | 13,475
Liabilities: |  |
Demand, interest checking and money market accounts | 8,676,436 | 8,571,500
Regular savings | 3,339,859 | 2,980,530
Certificates of deposit | 1,516,028 | 1,465,612
FHLB advances at fair value | 230,000 | 323,000
Other borrowings | 154,533 | 182,877
Subordinated notes, net | 78,904 | 85,536
Junior subordinated debentures at fair value | 66,257 | 66,413
Debt Securities, Available-for-Sale | 2,237,939 | 2,373,783
Securities—held-to-maturity | 879,278 | 907,514
FHLB advances at fair value | 230,000 | 323,000
Subordinated notes, net | 80,170 | 92,851
Interest rate swaps [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 19,189 | 15,129
Liabilities: |  |
Derivatives: | 30,272 | 29,809
Interest rate swaps [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 19,189 | 15,129
Liabilities: |  |
Derivatives: | 30,272 | 29,809
Interest Rate Forward Sales Commitments [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 342 | 275
Liabilities: |  |
Derivatives: | 15 | 185
Interest Rate Forward Sales Commitments [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 342 | 275
Liabilities: |  |
Derivatives: | 15 | 185
Loan Participations and Assignments | Reported Value Measurement [Member] |  |
Liabilities: |  |
Derivatives: | 28 | 42
Loan Participations and Assignments | Estimate of Fair Value Measurement [Member] |  |
Liabilities: |  |
Derivatives: | 28 | 42
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Debt Securities, Available-for-Sale | 2,212,720 | 2,348,479
Securities—held-to-maturity | 1,007,122 | 1,052,028
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Debt Securities, Available-for-Sale | 2,212,720 | 2,348,479
Securities—held-to-maturity | 872,530 | 900,522
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Debt Securities, Available-for-Sale | 25,219 | 25,304
Securities—held-to-maturity | 6,781 | 7,027
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Debt Securities, Available-for-Sale | 25,219 | 25,304
Securities—held-to-maturity | $ 6,748 | $ 6,992

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