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FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value By Balance Sheet Location) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Securities—trading | $ 26,875 | $ 24,980
Debt Securities, Available-for-sale | 3,446,575 | 2,322,593
Securities—held-to-maturity | 466,002 | 448,681
Securities purchased under agreements to resell | 300,000 | 0
Liabilities: |  |
FHLB advances at fair value | 50,000 | 150,000
Subordinated notes, net | 98,472 | 98,201
Carrying Value |  |
Assets: |  |
Cash and cash equivalents | 2,200,582 | 1,234,183
Securities—trading | 26,875 | 24,980
Debt Securities, Available-for-sale | 3,446,575 | 2,322,593
Securities purchased under agreements to resell | 300,000 | 0
Loans receivable held for sale | 63,678 | 243,795
Loans receivable | 9,218,384 | 9,870,982
FHLB stock | 12,000 | 16,358
Bank-owned life insurance | 192,950 | 191,830
Mortgage servicing rights | 15,753 | 15,223
Liabilities: |  |
Demand, interest checking and money market accounts | 10,539,628 | 9,253,494
Regular savings | 2,773,995 | 2,398,482
Certificates of deposit | 851,054 | 915,320
FHLB advances at fair value | 50,000 | 150,000
Other borrowings | 247,358 | 184,785
Subordinated notes, net |  | 98,201
Junior subordinated debentures at fair value | 124,853 | 116,974
Estimated Fair Value |  |
Assets: |  |
Cash and cash equivalents | 2,200,582 | 1,234,183
Securities—trading | 26,875 | 24,980
Debt Securities, Available-for-sale | 3,446,575 | 2,322,593
Securities purchased under agreements to resell | 300,000 | 0
Loans receivable held for sale | 64,245 | 245,667
Loans receivable | 9,271,840 | 9,810,293
FHLB stock | 12,000 | 16,358
Bank-owned life insurance | 192,950 | 191,830
Mortgage servicing rights | 22,814 | 18,084
Liabilities: |  |
Demand, interest checking and money market accounts | 10,539,628 | 9,253,494
Regular savings | 2,773,995 | 2,398,482
Certificates of deposit | 851,780 | 919,920
FHLB advances at fair value | 50,629 | 152,779
Other borrowings | 247,358 | 184,785
Subordinated notes, net | 105,875 | 98,201
Junior subordinated debentures at fair value | 124,853 | 116,974
Interest rate swaps [Member] | Carrying Value |  |
Assets: |  |
Derivatives: | 25,627 | 39,066
Liabilities: |  |
Derivatives: | 15,550 | 22,336
Interest rate swaps [Member] | Estimated Fair Value |  |
Assets: |  |
Derivatives: | 25,627 | 39,066
Liabilities: |  |
Derivatives: | 15,550 | 22,336
Interest Rate Forward Sales Commitments [Member] | Carrying Value |  |
Assets: |  |
Derivatives: | 2,309 | 5,641
Liabilities: |  |
Derivatives: | 136 | 1,755
Interest Rate Forward Sales Commitments [Member] | Estimated Fair Value |  |
Assets: |  |
Derivatives: | 2,309 | 5,641
Liabilities: |  |
Derivatives: | 136 | 1,755
Fair Value, Inputs, Level 2 [Member] | Carrying Value |  |
Assets: |  |
Securities—held-to-maturity | 445,499 | 410,038
Fair Value, Inputs, Level 2 [Member] | Estimated Fair Value |  |
Assets: |  |
Securities—held-to-maturity | 463,913 | 436,882
Fair Value, Inputs, Level 3 [Member] | Carrying Value |  |
Assets: |  |
Securities—held-to-maturity | 2,313 | 11,769
Fair Value, Inputs, Level 3 [Member] | Estimated Fair Value |  |
Assets: |  |
Securities—held-to-maturity | $ 2,089 | $ 11,799

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