FEDERAL HOME LOAN BANK ADVANCES - FHLB ADVANCES (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2016	Dec. 31, 2015
FHLB advances
Total FHLB advances	$ 517,500	$ 699,500
Weighted average interest rate (as percent)	2.15%
Additional collateralized advances available	$ 734,000	567,000
Overnight advance
FHLB advances
Total FHLB advances		150,000
Variable interest rate advance indexed to 3-Month LIBOR plus 0.14% due on December 20, 2016
FHLB advances
Total FHLB advances	$ 10,000	$ 10,000
Variable interest rate advance indexed to 3-Month LIBOR plus 0.14% due on December 20, 2016 \| London Interbank Offered Rate (LIBOR)
FHLB advances
Applicable margin (as a percent)	0.14%	0.14%
Fixed interest rate advances with a weighted average interest rate of 1.64% due through 2023
FHLB advances
Total FHLB advances	$ 407,500	$ 439,500
Weighted average interest rate (as percent)	1.64%	1.64%
Putable fixed interest rate advances with a weighted average interest rate of 4.39% due through 2017
FHLB advances
Total FHLB advances	$ 100,000	$ 100,000
Weighted average interest rate (as percent)	4.39%	4.39%
Putable fixed interest rate advances with a weighted average interest rate of 4.39% due through 2017 \| Minimum
FHLB advances
Original fixed rate periods	1 year
Original maturities	3 years
Putable fixed interest rate advances with a weighted average interest rate of 4.39% due through 2017 \| Maximum
FHLB advances
Original fixed rate periods	5 years
Original maturities	10 years
Various other unsecured lines of credit
FHLB advances
Unsecured lines of credit	$ 170,000	$ 170,000

Represents the period of time between issuance and the end of the original fixed rate period of the debt instrument.

No definition available.

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- Definition

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.

+ References

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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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

+ References

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

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 13
-Subparagraph 3(a)
-Article 9

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- Definition

States the weighted average interest rate applicable to the advances from the Federal Home Loan Bank outstanding as of the Balance Sheet date.

+ References

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

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