Annual report pursuant to Section 13 and 15(d)

BORROWINGS (Advances from the FHLB) (Details)

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BORROWINGS (Advances from the FHLB) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Advances from the FHLB    
Advance Amount $ 780,000 $ 385,000
Adjustable Rate Credit One    
Advances from the FHLB    
Interest Rate 1.16% 3.25%
Maturity Date Aug. 17, 2029 Aug. 23, 2022
Advance Amount $ 50,000 $ 55,000
Adjustable Rate Credit Two    
Advances from the FHLB    
Interest Rate 1.41% 3.26%
Maturity Date May 15, 2024 Nov. 23, 2022
Advance Amount $ 200,000 $ 65,000
Adjustable Rate Credit Three    
Advances from the FHLB    
Interest Rate 1.16% 3.26%
Maturity Date May 22, 2029 Nov. 23, 2022
Advance Amount $ 150,000 $ 10,000
Adjustable Rate Credit Four    
Advances from the FHLB    
Interest Rate 1.16% 3.26%
Maturity Date May 30, 2029 Nov. 23, 2022
Advance Amount $ 50,000 $ 10,000
Adjustable Rate Credit Five    
Advances from the FHLB    
Interest Rate 1.16%  
Maturity Date Jun. 21, 2029  
Advance Amount $ 100,000  
Fixed Rate Convertible    
Advances from the FHLB    
Interest Rate 1.78% 1.78%
Maturity Date Oct. 26, 2028 Oct. 26, 2028
Advance Amount $ 200,000 $ 200,000
Fixed Rate Hybrid One    
Advances from the FHLB    
Interest Rate 1.58% 2.37%
Maturity Date May 18, 2020 Oct. 10, 2019
Advance Amount $ 20,000 $ 25,000
Fixed Rate Hybrid Two    
Advances from the FHLB    
Interest Rate   1.58%
Maturity Date   May 18, 2020
Advance Amount   $ 20,000
Fixed Rate Credit    
Advances from the FHLB    
Interest Rate 1.54%  
Maturity Date Oct. 02, 2020  
Advance Amount $ 10,000  
LIBOR | Adjustable Rate Credit One    
Advances from the FHLB    
Spread on LIBOR (0.75%) 0.44%
LIBOR | Adjustable Rate Credit Two    
Advances from the FHLB    
Spread on LIBOR (0.50%) 0.45%
LIBOR | Adjustable Rate Credit Three    
Advances from the FHLB    
Spread on LIBOR (0.75%) 0.45%
LIBOR | Adjustable Rate Credit Four    
Advances from the FHLB    
Spread on LIBOR (0.75%) 0.45%
LIBOR | Adjustable Rate Credit Five    
Advances from the FHLB    
Spread on LIBOR (0.75%)