FEDERAL HOME LOAN BANK ADVANCES - FHLB ADVANCES (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
FHLB advances
Total FHLB advances	$ 572,500	$ 750,000
Additional collateralized advances available	409,000	259,000
Overnight advance
FHLB advances
Total FHLB advances	125,000	200,000
Variable interest rate advance indexed to 3-Month LIBOR plus 0.14%
FHLB advances
Total FHLB advances	$ 10,000	$ 10,000
Variable interest rate advance indexed to 3-Month LIBOR plus 0.14% \| London Interbank Offered Rate (LIBOR)
FHLB advances
Applicable margin (as a percent)	0.14%	0.14%
Fixed interest rate advances
FHLB advances
Total FHLB advances	$ 437,500	$ 540,000
Various other unsecured lines of credit
FHLB advances
Unsecured lines of credit	$ 125,000	$ 125,000

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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-SubTopic 470
-Section 45
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Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Topic 942
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