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BORROWINGS - Schedule of Long-term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Amount    
Subordinated debt $ 177,887 $ 120,000
FHLB long-term advances 299,580 241
Capital loan with municipality 775 775
Total long-term debt $ 469,423 $ 119,654
Average Rate [Abstract]    
Debt, Weighted Average Interest Rate 5.13% 5.13%
Federal Home Loan Bank 1.90% 1.09%
Weighted average rate on other long-term debt 0.00% 0.00%
Total long-term debt 3.16% 5.14%
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ (8,819) $ (1,362)