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FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value By Balance Sheet Location) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Reported Value Measurement [Member] |  |
Assets: |  |
Cash and cash equivalents | $ 209,276 | $ 254,464
Loans receivable held for sale | 9,357 | 11,170
Loans receivable | 10,717,956 | 10,660,812
Equity securities | 387 | 449
FHLB stock | 11,741 | 24,028
Bank-owned life insurance | 306,600 | 304,366
Mortgage servicing rights | 13,444 | 13,909
SBA servicing asset | 849 | 740
Investments in limited partnerships | 12,975 | 13,475
Liabilities: |  |
Demand, interest checking and money market accounts | 8,500,958 | 8,571,500
Regular savings | 3,171,933 | 2,980,530
Certificates of deposit | 1,485,880 | 1,477,467
FHLB advances at fair value | 52,000 | 323,000
Other borrowings | 183,341 | 182,877
Junior subordinated debentures at fair value | 66,586 | 66,413
Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Cash and cash equivalents | 209,276 | 254,464
Loans receivable held for sale | 9,441 | 11,219
Loans receivable | 10,296,927 | 10,250,271
Equity securities | 387 | 449
FHLB stock | 11,741 | 24,028
Bank-owned life insurance | 306,600 | 304,366
Mortgage servicing rights | 36,755 | 35,794
SBA servicing asset | 849 | 740
Investments in limited partnerships | 12,975 | 13,475
Liabilities: |  |
Demand, interest checking and money market accounts | 8,500,958 | 8,571,500
Regular savings | 3,171,933 | 2,980,530
Certificates of deposit | 1,473,413 | 1,465,612
FHLB advances at fair value | 52,000 | 323,000
Other borrowings | 183,341 | 182,877
Subordinated notes, net | 86,598 | 85,536
Junior subordinated debentures at fair value | 66,586 | 66,413
Debt Securities, Available-for-Sale | 2,244,939 | 2,373,783
Securities—held-to-maturity | 869,097 | 907,514
FHLB advances at fair value | 52,000 | 323,000
Subordinated notes, net | 89,456 | 92,851
Interest rate swaps [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 22,848 | 15,129
Liabilities: |  |
Derivatives: | 40,099 | 29,809
Interest rate swaps [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 22,848 | 15,129
Liabilities: |  |
Derivatives: | 40,099 | 29,809
Interest Rate Forward Sales Commitments [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 285 | 275
Liabilities: |  |
Derivatives: | 110 | 185
Interest Rate Forward Sales Commitments [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 285 | 275
Liabilities: |  |
Derivatives: | 110 | 185
Loan Participations and Assignments | Reported Value Measurement [Member] |  |
Liabilities: |  |
Derivatives: | 18 | 42
Loan Participations and Assignments | Estimate of Fair Value Measurement [Member] |  |
Liabilities: |  |
Derivatives: | 18 | 42
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Debt Securities, Available-for-Sale | 2,219,582 | 2,348,479
Securities—held-to-maturity | 1,031,324 | 1,052,028
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Debt Securities, Available-for-Sale | 2,219,582 | 2,348,479
Securities—held-to-maturity | 862,143 | 900,522
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Debt Securities, Available-for-Sale | 25,357 | 25,304
Securities—held-to-maturity | 6,988 | 7,027
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Debt Securities, Available-for-Sale | 25,357 | 25,304
Securities—held-to-maturity | $ 6,954 | $ 6,992

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