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FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value By Balance Sheet Location) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Securities—trading | $ 25,039 | $ 24,980
Securities—available-for-sale | 2,989,760 | 2,322,593
Securities—held-to-maturity | 459,595 | 448,681
Liabilities: |  |
FHLB advances at fair value | 100,000 | 150,000
Subordinated notes, net | 98,290 | 98,201
Carrying Value |  |
Assets: |  |
Cash and cash equivalents | 1,649,927 | 1,234,183
Securities—trading | 25,039 | 24,980
Securities—available-for-sale | 2,989,760 | 2,322,593
Loans receivable held for sale | 135,263 | 243,795
Loans receivable | 9,947,697 | 9,870,982
FHLB stock | 14,001 | 16,358
Bank-owned life insurance | 191,388 | 191,830
Mortgage servicing rights | 15,407 | 15,223
Liabilities: |  |
Demand, interest checking and money market accounts | 10,044,158 | 9,253,494
Regular savings | 2,597,731 | 2,398,482
Certificates of deposit | 906,978 | 915,320
FHLB advances at fair value | 100,000 | 150,000
Other borrowings | 216,260 | 184,785
Subordinated notes, net |  | 98,201
Junior subordinated debentures at fair value | 117,248 | 116,974
Estimated Fair Value |  |
Assets: |  |
Cash and cash equivalents | 1,649,927 | 1,234,183
Securities—trading | 25,039 | 24,980
Securities—available-for-sale | 2,989,760 | 2,322,593
Loans receivable held for sale | 136,873 | 245,667
Loans receivable | 9,967,242 | 9,810,293
FHLB stock | 14,001 | 16,358
Bank-owned life insurance | 191,388 | 191,830
Mortgage servicing rights | 21,176 | 18,084
Liabilities: |  |
Demand, interest checking and money market accounts | 10,044,158 | 9,253,494
Regular savings | 2,597,731 | 2,398,482
Certificates of deposit | 910,069 | 919,920
FHLB advances at fair value | 101,908 | 152,779
Other borrowings | 216,260 | 184,785
Subordinated notes, net | 98,290 | 98,201
Junior subordinated debentures at fair value | 117,248 | 116,974
Interest rate swaps [Member] | Carrying Value |  |
Assets: |  |
Derivatives: | 25,246 | 39,066
Liabilities: |  |
Derivatives: | 17,923 | 22,336
Interest rate swaps [Member] | Estimated Fair Value |  |
Assets: |  |
Derivatives: | 25,246 | 39,066
Liabilities: |  |
Derivatives: | 17,923 | 22,336
Interest Rate Forward Sales Commitments [Member] | Carrying Value |  |
Assets: |  |
Derivatives: | 6,186 | 5,641
Liabilities: |  |
Derivatives: | 85 | 1,755
Interest Rate Forward Sales Commitments [Member] | Estimated Fair Value |  |
Assets: |  |
Derivatives: | 6,186 | 5,641
Liabilities: |  |
Derivatives: | 85 | 1,755
Fair Value, Inputs, Level 2 [Member] | Carrying Value |  |
Assets: |  |
Securities—held-to-maturity | 418,871 | 410,038
Fair Value, Inputs, Level 2 [Member] | Estimated Fair Value |  |
Assets: |  |
Securities—held-to-maturity | 436,484 | 436,882
Fair Value, Inputs, Level 3 [Member] | Carrying Value |  |
Assets: |  |
Securities—held-to-maturity | 23,084 | 11,769
Fair Value, Inputs, Level 3 [Member] | Estimated Fair Value |  |
Assets: |  |
Securities—held-to-maturity | $ 23,111 | $ 11,799

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