FEDERAL HOME LOAN BANK ADVANCES - FHLB ADVANCES (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2018	Dec. 31, 2017
FHLB advances
Total FHLB advances	$ 860,000	$ 737,500
Additional collateralized advances available	209,000	378,000
Overnight advance
FHLB advances
Total FHLB advances	500,000	330,000
Variable interest rate advance indexed to 3-Month LIBOR plus 0.14% due in December 2018
FHLB advances
Total FHLB advances	$ 10,000	$ 10,000
Variable interest rate advance indexed to 3-Month LIBOR plus 0.14% due in December 2018 \| 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	$ 350,000	$ 397,500
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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(3)(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22 (b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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