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FAIR VALUE OF FINANCIAL INSTRUMENTS (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities—trading | $ 26,875 |  | $ 24,980 |  |  |
Debt Securities, Available-for-sale | 3,446,575 |  | 2,322,593 |  |  |
Advances from FHLB | 50,000 |  | 150,000 |  |  |
Recurring [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 3,446,575 |  | 2,322,593 |  |  |
Total assets | 3,542,866 |  | 2,525,834 |  |  |
Junior subordinated debentures net of unamortized deferred issuance costs at fair value | 124,853 |  | 116,974 |  |  |
Total liabilities | 140,539 |  | 141,065 |  |  |
Recurring [Member] | Interest rate lock and forward sale commitments [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative assets | 2,309 |  | 39,066 |  |  |
Derivative liabilities | 136 |  | 22,336 |  |  |
Recurring [Member] | Interest rate swaps [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative assets | 25,627 |  | 5,641 |  |  |
Derivative liabilities | 15,550 |  | 1,755 |  |  |
Recurring [Member] | U.S. Government and agency obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 181,052 |  | 141,735 |  |  |
Recurring [Member] | Municipal bonds |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 310,391 |  | 303,518 |  |  |
Recurring [Member] | Corporate bonds |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 164,244 |  | 221,769 |  |  |
Recurring [Member] | TPS and TRUP CDOs [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities—trading | 26,875 |  | 24,980 |  |  |
Recurring [Member] | Mortgage-backed securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 2,584,264 |  | 1,646,152 |  |  |
Recurring [Member] | Asset-backed securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 206,624 |  | 9,419 |  |  |
Recurring [Member] | Loans [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 41,480 |  | 133,554 |  |  |
Recurring [Member] | Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 0 |  | 0 |  |  |
Total assets | 0 |  | 0 |  |  |
Junior subordinated debentures net of unamortized deferred issuance costs at fair value | 0 |  | 0 |  |  |
Total liabilities | 0 |  | 0 |  |  |
Recurring [Member] | Level 1 [Member] | Interest rate lock and forward sale commitments [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative assets | 0 |  | 0 |  |  |
Derivative liabilities | 0 |  | 0 |  |  |
Recurring [Member] | Level 1 [Member] | Interest rate swaps [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative assets | 0 |  | 0 |  |  |
Derivative liabilities | 0 |  | 0 |  |  |
Recurring [Member] | Level 1 [Member] | U.S. Government and agency obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 0 |  | 0 |  |  |
Recurring [Member] | Level 1 [Member] | Municipal bonds |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 0 |  | 0 |  |  |
Recurring [Member] | Level 1 [Member] | Corporate bonds |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 0 |  | 0 |  |  |
Recurring [Member] | Level 1 [Member] | TPS and TRUP CDOs [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities—trading | 0 |  | 0 |  |  |
Recurring [Member] | Level 1 [Member] | Mortgage-backed securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 0 |  | 0 |  |  |
Recurring [Member] | Level 1 [Member] | Asset-backed securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 0 |  | 0 |  |  |
Recurring [Member] | Level 1 [Member] | Loans [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 0 |  | 0 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 3,446,575 |  | 2,322,593 |  |  |
Total assets | 3,514,596 |  | 2,495,633 |  |  |
Junior subordinated debentures net of unamortized deferred issuance costs at fair value | 0 |  | 0 |  |  |
Total liabilities | 15,686 |  | 24,091 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest rate lock and forward sale commitments [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative assets | 914 |  | 39,066 |  |  |
Derivative liabilities | 136 |  | 22,336 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest rate swaps [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative assets | 25,627 |  | 420 |  |  |
Derivative liabilities | 15,550 |  | 1,755 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Government and agency obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 181,052 |  | 141,735 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal bonds |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 310,391 |  | 303,518 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate bonds |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 164,244 |  | 221,769 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | TPS and TRUP CDOs [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities—trading | 0 |  | 0 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-backed securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 2,584,264 |  | 1,646,152 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 206,624 |  | 9,419 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Loans [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 41,480 |  | 133,554 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 0 |  | 0 |  |  |
Total assets | 28,270 |  | 30,201 |  |  |
Junior subordinated debentures net of unamortized deferred issuance costs at fair value | 124,853 |  | 116,974 |  |  |
Total liabilities | 124,853 |  | 116,974 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate lock and forward sale commitments [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative assets | 1,395 |  | 0 |  |  |
Derivative liabilities | 0 |  | 0 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate swaps [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative assets | 0 | $ 2,574 | 5,221 | $ 8,454 | $ 5,816 | $ 791
Derivative liabilities | 0 |  | 0 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. Government and agency obligations [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 0 |  | 0 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal bonds |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 0 |  | 0 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate bonds |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 0 |  | 0 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | TPS and TRUP CDOs [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Securities—trading | 26,875 |  | 24,980 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage-backed securities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 0 |  | 0 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Debt Securities, Available-for-sale | 0 |  | 0 |  |  |
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Loans [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | $ 0 |  | $ 0 |  |  |

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