FEDERAL HOME LOAN BANK (FHLB) ADVANCES (Details) (USD $)	15 Months Ended	3 Months Ended
Mar. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
FHLB advances
Total FHLB advances	596,500,000	596,500,000	$ 707,500,000
Weighted average interest rate (as percent)	1.98%	1.98%
Additional collateralized advances available	555,000,000	555,000,000	452,000,000
Overnight advance with an interest rate of 0.15% due on April 1, 2015
FHLB advances
Total FHLB advances	57,000,000	57,000,000	198,000,000
Weighted average interest rate (as percent)	0.15%	0.15%
Overnight advance with an interest rate of 0.15% due on April 1, 2015 \| London Interbank Offered Rate (LIBOR) [Member]
FHLB advances
Variable interest rate basis	3-Month LIBOR
Applicable margin (as a percent)	0.14%
Variable interest rate advance indexed to 3-Month Libor plus 0.14% due on December 19, 2015
FHLB advances
Total FHLB advances	10,000,000	10,000,000	10,000,000
Fixed interest rate advances with a weighted average interest rate of 1.701% due through 2023
FHLB advances
Total FHLB advances	429,500,000	429,500,000	399,500,000
Weighted average interest rate (as percent)	1.70%	1.70%
Putable fixed interest rate advances with a weighted average interest rate of 4.39% due through 2017
FHLB advances
Total FHLB advances	100,000,000	100,000,000	100,000,000
Weighted average interest rate (as percent)	4.39%	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	166,000,000	166,000,000	166,000,000
Outstanding borrowings	15,000,000	15,000,000	$ 0

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

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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

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ 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 470

-Section 45

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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

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 210

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-Paragraph 1

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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

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