Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS (Advances from the FHLB) (Details)

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BORROWINGS (Advances from the FHLB) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Federal Home Loan Bank, Advances [Line Items]    
Advance Amount $ 840,000 $ 385,000
Adjustable Rate Credit One    
Federal Home Loan Bank, Advances [Line Items]    
Interest Rate 1.34% 3.25%
Maturity Date Aug. 17, 2029 Aug. 23, 2022
Advance Amount $ 50,000 $ 55,000
Adjustable Rate Credit One | LIBOR    
Federal Home Loan Bank, Advances [Line Items]    
Spread to 3-Month LIBOR (0.75%) 0.44%
Adjustable Rate Credit Two    
Federal Home Loan Bank, Advances [Line Items]    
Interest Rate 1.59% 3.26%
Maturity Date May 15, 2024 Nov. 23, 2022
Advance Amount $ 200,000 $ 65,000
Adjustable Rate Credit Two | LIBOR    
Federal Home Loan Bank, Advances [Line Items]    
Spread to 3-Month LIBOR (0.50%) 0.45%
Adjustable Rate Credit Three    
Federal Home Loan Bank, Advances [Line Items]    
Interest Rate 1.34% 3.26%
Maturity Date May 22, 2029 Nov. 23, 2022
Advance Amount $ 150,000 $ 10,000
Adjustable Rate Credit Three | LIBOR    
Federal Home Loan Bank, Advances [Line Items]    
Spread to 3-Month LIBOR (0.75%) 0.45%
Adjustable Rate Credit Four    
Federal Home Loan Bank, Advances [Line Items]    
Interest Rate 1.34% 3.26%
Maturity Date May 30, 2029 Nov. 23, 2022
Advance Amount $ 50,000 $ 10,000
Adjustable Rate Credit Four | LIBOR    
Federal Home Loan Bank, Advances [Line Items]    
Spread to 3-Month LIBOR (0.75%) 0.45%
Convertible Flipper One    
Federal Home Loan Bank, Advances [Line Items]    
Interest Rate 1.34%  
Maturity Date Jun. 21, 2029  
Advance Amount $ 100,000  
Convertible Flipper One | LIBOR    
Federal Home Loan Bank, Advances [Line Items]    
Spread to 3-Month LIBOR (0.75%)  
Convertible Flipper Two    
Federal Home Loan Bank, Advances [Line Items]    
Interest Rate 1.78%  
Maturity Date Oct. 26, 2028  
Advance Amount $ 200,000  
Convertible Flipper Three    
Federal Home Loan Bank, Advances [Line Items]    
Interest Rate 2.37%  
Maturity Date Oct. 10, 2019  
Advance Amount $ 25,000  
Convertible Flipper Four    
Federal Home Loan Bank, Advances [Line Items]    
Interest Rate 1.58%  
Maturity Date May 18, 2020  
Advance Amount $ 20,000  
Fixed Rate Convertible    
Federal Home Loan Bank, Advances [Line Items]    
Interest Rate 2.65% 1.78%
Maturity Date Oct. 24, 2019 Oct. 26, 2028
Advance Amount $ 25,000 $ 200,000
Fixed Rate Hybrid One    
Federal Home Loan Bank, Advances [Line Items]    
Interest Rate 1.54% 2.37%
Maturity Date Oct. 02, 2020 Oct. 10, 2019
Advance Amount $ 10,000 $ 25,000
Fixed Rate Hybrid Two    
Federal Home Loan Bank, Advances [Line Items]    
Interest Rate 1.32% 1.58%
Maturity Date Oct. 02, 2019 May 18, 2020
Advance Amount $ 10,000 $ 20,000