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BORROWINGS (Advances from the FHLB) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Federal Home Loan Bank, Advances [Line Items] |  |
Advance Amount | $ 930,000 | $ 385,000
Adjustable Rate Credit One |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Interest Rate | 2.76% | 3.25%
Maturity Date | Aug. 23, 2022 | Aug. 23, 2022
Advance Amount | $ 55,000 | $ 55,000
Adjustable Rate Credit One | LIBOR |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Spread to 3-Month LIBOR | 0.44% | 0.44%
Adjustable Rate Credit Two |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Interest Rate | 2.77% | 3.26%
Maturity Date | Nov. 23, 2022 | Nov. 23, 2022
Advance Amount | $ 65,000 | $ 65,000
Adjustable Rate Credit Two | LIBOR |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Spread to 3-Month LIBOR | 0.45% | 0.45%
Adjustable Rate Credit Three |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Interest Rate | 2.77% | 3.26%
Maturity Date | Nov. 23, 2022 | Nov. 23, 2022
Advance Amount | $ 10,000 | $ 10,000
Adjustable Rate Credit Three | LIBOR |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Spread to 3-Month LIBOR | 0.45% | 0.45%
Adjustable Rate Credit Four |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Interest Rate | 2.77% | 3.26%
Maturity Date | Nov. 23, 2022 | Nov. 23, 2022
Advance Amount | $ 10,000 | $ 10,000
Adjustable Rate Credit Four | LIBOR |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Spread to 3-Month LIBOR | 0.45% | 0.45%
Convertible Flipper One |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Interest Rate | 1.82% |
Maturity Date | May 15, 2024 |
Advance Amount | $ 200,000 |
Convertible Flipper One | LIBOR |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Spread to 3-Month LIBOR | (0.50%) |
Convertible Flipper Two |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Interest Rate | 1.57% |
Maturity Date | May 22, 2029 |
Advance Amount | $ 150,000 |
Convertible Flipper Two | LIBOR |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Spread to 3-Month LIBOR | (0.75%) |
Convertible Flipper Three |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Interest Rate | 1.57% |
Maturity Date | May 30, 2029 |
Advance Amount | $ 50,000 |
Convertible Flipper Three | LIBOR |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Spread to 3-Month LIBOR | (0.75%) |
Convertible Flipper Four |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Interest Rate | 1.57% |
Maturity Date | Jun. 21, 2029 |
Advance Amount | $ 100,000 |
Convertible Flipper Four | LIBOR |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Spread to 3-Month LIBOR | (0.75%) |
Fixed Rate Convertible |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Interest Rate | 1.78% | 1.78%
Maturity Date | Oct. 26, 2028 | Oct. 26, 2028
Advance Amount | $ 200,000 | $ 200,000
Fixed Rate Hybrid One |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Interest Rate | 2.37% | 2.37%
Maturity Date | Oct. 10, 2019 | Oct. 10, 2019
Advance Amount | $ 25,000 | $ 25,000
Fixed Rate Hybrid Two |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Interest Rate | 1.58% | 1.58%
Maturity Date | May 18, 2020 | May 18, 2020
Advance Amount | $ 20,000 | $ 20,000
Fixed Rate Hybrid Three |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Interest Rate | 2.65% |
Maturity Date | Oct. 24, 2019 |
Advance Amount | $ 25,000 |
Fixed Rate Credit One |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Interest Rate | 1.54% |
Maturity Date | Oct. 02, 2020 |
Advance Amount | $ 10,000 |
Fixed Rate Credit Two |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Interest Rate | 1.32% |
Maturity Date | Oct. 02, 2019 |
Advance Amount | $ 10,000 |

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