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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%