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FAIR VALUE OF FINANCIAL INSTRUMENTS (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities—trading | $ 25,039 | $ 24,980 |  |
Securities—available-for-sale | 2,989,760 | 2,322,593 |  |
Advances from FHLB | 100,000 | 150,000 |  |
Recurring [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities—available-for-sale | 2,989,760 | 2,322,593 |  |
Total assets | 3,106,224 | 2,525,834 |  |
Junior subordinated debentures net of unamortized deferred issuance costs at fair value | 117,248 | 116,974 |  |
Total liabilities | 135,256 | 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 | 6,186 | 39,066 |  |
Derivative liabilities | 85 | 22,336 |  |
Recurring [Member] | Interest rate swaps [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | 25,246 | 5,641 |  |
Derivative liabilities | 17,923 | 1,755 |  |
Recurring [Member] | U.S. Government and agency obligations [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities—available-for-sale | 62,846 | 141,735 |  |
Recurring [Member] | Municipal bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities—available-for-sale | 300,735 | 303,518 |  |
Recurring [Member] | Corporate bonds |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities—available-for-sale | 245,428 | 221,769 |  |
Recurring [Member] | TPS and TRUP CDOs [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities—trading | 25,039 | 24,980 |  |
Recurring [Member] | Mortgage-backed securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities—available-for-sale | 2,377,003 | 1,646,152 |  |
Recurring [Member] | Asset-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities—available-for-sale | 3,748 | 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 | 59,993 | 133,554 |  |
Recurring [Member] | Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
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] |  |  |  |
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] |  |  |  |
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] |  |  |  |
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] |  |  |  |
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] |  |  |  |
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] |  |  |  |
Securities—available-for-sale | 2,989,760 | 2,322,593 |  |
Total assets | 3,078,248 | 2,495,633 |  |
Junior subordinated debentures net of unamortized deferred issuance costs at fair value | 0 | 0 |  |
Total liabilities | 18,008 | 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 | 3,249 | 39,066 |  |
Derivative liabilities | 85 | 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 | 25,246 | 420 |  |
Derivative liabilities | 17,923 | 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] |  |  |  |
Securities—available-for-sale | 62,846 | 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] |  |  |  |
Securities—available-for-sale | 300,735 | 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] |  |  |  |
Securities—available-for-sale | 245,428 | 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] |  |  |  |
Securities—available-for-sale | 2,377,003 | 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] |  |  |  |
Securities—available-for-sale | 3,748 | 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 | 59,993 | 133,554 |  |
Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities—available-for-sale | 0 | 0 |  |
Total assets | 27,976 | 30,201 |  |
Junior subordinated debentures net of unamortized deferred issuance costs at fair value | 117,248 | 116,974 |  |
Total liabilities | 117,248 | 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 | 2,937 | 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 | 5,221 | $ 2,517 | $ 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] |  |  |  |
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] |  |  |  |
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] |  |  |  |
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 | 25,039 | 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] |  |  |  |
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] |  |  |  |
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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