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BORROWED FUNDS - Summary of Borrowed Funds (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Short-term borrowings | $ 835,891 | $ 667,300
Long-term borrowings | 379,353 | 469,775
Total borrowings | $ 1,215,244 | $ 1,137,075
Weighted average rate on short-term borrowings (as percent) | 1.93% | 1.48%
Weighted average rate on long-term borrowings (as percent) | 2.79% | 2.46%
Weighted average rate (as percent) | 2.19% | 1.88%
Advances from the FHLB |  |
Debt Instrument [Line Items] |  |
Short-term borrowings | $ 835,891 | $ 667,300
Long-term borrowings | $ 289,969 | $ 380,436
Weighted average rate on short-term borrowings (as percent) | 1.93% | 1.48%
Weighted average rate on long-term borrowings (as percent) | 1.66% | 1.54%
Subordinated borrowings |  |
Debt Instrument [Line Items] |  |
Long-term borrowings | $ 73,920 | $ 73,875
Weighted average rate on long-term borrowings (as percent) | 7.00% | 7.00%
Junior subordinated borrowings |  |
Debt Instrument [Line Items] |  |
Long-term borrowings | $ 15,464 | $ 15,464
Weighted average rate on long-term borrowings (as percent) | 3.77% | 3.30%

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