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FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value By Balance Sheet Location) (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Reported Value Measurement [Member] |  |
Assets: |  |
Cash and cash equivalents | $ 483,348 | $ 501,858
Loans receivable held for sale | 37,651 | 32,021
Loans receivable | 11,529,872 | 11,199,135
Equity securities | 511 | 481
FHLB stock | 35,151 | 22,451
Bank-owned life insurance | 316,365 | 312,549
Mortgage servicing rights | 12,227 | 12,618
SBA servicing asset | 1,038 | 869
Investments in limited partnerships | 16,162 | 13,955
Liabilities: |  |
Demand, interest checking and money market accounts | 8,511,147 | 8,536,303
Regular savings | 3,538,372 | 3,478,423
Certificates of deposit | 1,477,772 | 1,499,672
FHLB advances at fair value | 565,000 | 290,000
Other borrowings | 117,112 | 125,257
Junior subordinated debentures at fair value | 73,366 | 67,477
Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Cash and cash equivalents | 483,348 | 501,858
Loans receivable held for sale | 37,960 | 32,215
Loans receivable | 11,413,939 | 10,894,024
Equity securities | 511 | 481
FHLB stock | 35,151 | 22,451
Bank-owned life insurance | 316,365 | 312,549
Mortgage servicing rights | 35,711 | 37,926
SBA servicing asset | 1,038 | 869
Investments in limited partnerships | 16,162 | 13,955
Liabilities: |  |
Demand, interest checking and money market accounts | 8,511,147 | 8,536,303
Regular savings | 3,538,372 | 3,478,423
Certificates of deposit | 1,470,631 | 1,492,829
FHLB advances at fair value | 565,000 | 290,000
Other borrowings | 117,112 | 125,257
Subordinated notes, net | 0 | 78,832
Junior subordinated debentures at fair value | 73,366 | 67,477
Debt Securities, Available-for-Sale | 2,064,581 | 2,104,511
Securities—held-to-maturity | 801,838 | 825,528
FHLB advances at fair value | 565,000 | 290,000
Subordinated notes, net | 0 | 80,278
Interest rate swaps [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 10,964 | 14,507
Liabilities: |  |
Derivatives: | 21,468 | 30,184
Interest rate swaps [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 10,964 | 14,507
Liabilities: |  |
Derivatives: | 21,468 | 30,184
Interest Rate Forward Sales Commitments [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 629 | 331
Liabilities: |  |
Derivatives: | 497 | 2
Interest Rate Forward Sales Commitments [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 629 | 331
Liabilities: |  |
Derivatives: | 497 | 2
Loan Participations and Assignments | Reported Value Measurement [Member] |  |
Liabilities: |  |
Derivatives: | 13 | 6
Loan Participations and Assignments | Estimate of Fair Value Measurement [Member] |  |
Liabilities: |  |
Derivatives: | 13 | 6
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Debt Securities, Available-for-Sale | 2,036,637 | 2,078,826
Securities—held-to-maturity | 975,073 | 995,237
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Debt Securities, Available-for-Sale | 2,036,637 | 2,078,826
Securities—held-to-maturity | 795,639 | 819,230
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Debt Securities, Available-for-Sale | 27,944 | 25,685
Securities—held-to-maturity | 6,239 | 6,327
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Debt Securities, Available-for-Sale | 27,944 | 25,685
Securities—held-to-maturity | $ 6,199 | $ 6,298

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