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BORROWED FUNDS - Summary of Borrowed Funds (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Short-term borrowings	$ 608,928	$ 1,118,832
Long-term borrowings	392,813	398,984
Total borrowings	$ 1,001,741	$ 1,517,816
Weighted average rate on short-term borrowings	2.65%	2.58%
Weighted average rate on long-term borrowings	3.34%	3.16%
Weighted average rate	2.92%	2.73%
Advances from the FHLB
Debt Instrument [Line Items]
Short-term borrowings	$ 608,928	$ 1,118,832
Long-term borrowings	$ 295,886	$ 309,466
Weighted average rate on short-term borrowings	2.65%	2.58%
Weighted average rate on long-term borrowings	2.36%	2.17%
Subordinated borrowings
Debt Instrument [Line Items]
Long-term borrowings	$ 74,143	$ 74,054
Weighted average rate on long-term borrowings	7.00%	7.00%
Trust I
Debt Instrument [Line Items]
Long-term borrowings	$ 15,464	$ 15,464
Weighted average rate on long-term borrowings	4.37%	4.50%
Trust II
Debt Instrument [Line Items]
Long-term borrowings	$ 7,320	$ 0
Weighted average rate on long-term borrowings	4.11%	0.00%

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