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FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value By Balance Sheet Location) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets: |  |
Debt Securities, Available-for-Sale | $ 2,018,525 | $ 2,104,511
Securities—held-to-maturity | 815,434 | 825,528
Liabilities: |  |
FHLB advances at fair value | 100,000 | 290,000
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Debt Securities, Available-for-Sale | 1,989,454 | 2,078,826
Securities—held-to-maturity | 965,401 | 995,237
Loans receivable held for sale | 20,334 | 32,021
Liabilities: |  |
Demand, interest checking and money market accounts | 8,769,730 | 8,536,303
Regular savings | 3,705,823 | 3,478,423
Certificates of deposit | 1,540,382 | 1,499,672
FHLB advances at fair value | 100,000 | 290,000
Other borrowings | 120,536 | 125,257
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Debt Securities, Available-for-Sale | 1,989,454 | 2,078,826
Securities—held-to-maturity | 809,271 | 819,230
Loans receivable held for sale | 20,599 | 32,215
Liabilities: |  |
Demand, interest checking and money market accounts | 8,769,730 | 8,536,303
Regular savings | 3,705,823 | 3,478,423
Certificates of deposit | 1,535,106 | 1,492,829
FHLB advances at fair value | 100,000 | 290,000
Other borrowings | 120,536 | 125,257
Subordinated notes, net | 0 | 78,832
Fair Value, Inputs, Level 2 [Member] |  |
Liabilities: |  |
Subordinated notes, net | 0 | 80,278
Fair Value, Inputs, Level 2 [Member] | Interest rate swaps [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 10,292 | 14,507
Liabilities: |  |
Derivatives: | 19,913 | 30,184
Fair Value, Inputs, Level 2 [Member] | Interest rate swaps [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 10,292 | 14,507
Liabilities: |  |
Derivatives: | 19,913 | 30,184
Fair Value, Inputs, Level 2 [Member] | Risk participation agreements | Reported Value Measurement [Member] |  |
Liabilities: |  |
Derivatives: | 8 | 6
Fair Value, Inputs, Level 2 [Member] | Risk participation agreements | Estimate of Fair Value Measurement [Member] |  |
Liabilities: |  |
Derivatives: | 8 | 6
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Debt Securities, Available-for-Sale | 29,071 | 25,685
Securities—held-to-maturity | 6,202 | 6,327
Loans receivable | 11,542,831 | 11,199,135
FHLB stock | 14,226 | 22,451
Mortgage servicing rights | 11,962 | 12,618
SBA servicing asset | 1,122 | 869
Investments in limited partnerships | 16,929 | 13,955
Liabilities: |  |
Junior subordinated debentures at fair value | 76,251 | 67,477
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Debt Securities, Available-for-Sale | 29,071 | 25,685
Securities—held-to-maturity | 6,163 | 6,298
Loans receivable | 11,445,723 | 10,894,024
FHLB stock | 14,226 | 22,451
Mortgage servicing rights | 35,526 | 37,926
SBA servicing asset | 1,122 | 869
Investments in limited partnerships | 16,929 | 13,955
Liabilities: |  |
Junior subordinated debentures at fair value | 76,251 | 67,477
Fair Value, Inputs, Level 3 [Member] | Interest Rate Forward Sales Commitments [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 319 | 331
Liabilities: |  |
Derivatives: | 106 | 2
Fair Value, Inputs, Level 3 [Member] | Interest Rate Forward Sales Commitments [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Derivatives: | 319 | 331
Liabilities: |  |
Derivatives: | 106 | 2
Level 1 [Member] | Reported Value Measurement [Member] |  |
Assets: |  |
Cash and cash equivalents | 672,863 | 501,858
Equity securities | 510 | 481
Bank-owned life insurance | 317,469 | 312,549
Level 1 [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Cash and cash equivalents | 672,863 | 501,858
Equity securities | 510 | 481
Bank-owned life insurance | $ 317,469 | $ 312,549

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