DERIVATIVE FINANCIAL INSTRUMENTS - Terms of Interest Swaps and Caps (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	May 31, 2012	Aug. 31, 2014	May 31, 2013
Interest rate swaps
Derivative [Line Items]
Notional Amount	$ 225,000
Swap 1
Derivative [Line Items]
Notional Amount	25,000
Effective Start Date	Apr. 06, 2015
Maturity Date	Apr. 05, 2020
Pay Fixed Rate	1.65%
Swap 2
Derivative [Line Items]
Notional Amount	25,000
Effective Start Date	May 05, 2015
Maturity Date	May 05, 2020
Pay Fixed Rate	1.683%
Swap 3
Derivative [Line Items]
Notional Amount	25,000
Effective Start Date	Jun. 05, 2015
Maturity Date	Jun. 05, 2020
Pay Fixed Rate	1.72%
Swap 4
Derivative [Line Items]
Notional Amount	25,000
Effective Start Date	Aug. 05, 2015
Maturity Date	Aug. 05, 2020
Pay Fixed Rate	2.44%
Swap 5
Derivative [Line Items]
Notional Amount	25,000
Effective Start Date	Feb. 05, 2016
Maturity Date	Feb. 05, 2021
Pay Fixed Rate	2.703%
Swap 6
Derivative [Line Items]
Notional Amount	50,000
Effective Start Date	Aug. 05, 2016
Maturity Date	Aug. 05, 2021
Pay Fixed Rate	2.88%
Swap 7
Derivative [Line Items]
Notional Amount	25,000
Effective Start Date	Oct. 01, 2014
Maturity Date	Aug. 31, 2017
Pay Fixed Rate	1.1973%
Swap 7 | 1-Month LIBOR
Derivative [Line Items]
Variable rate spread (as a percentage)	0.10%
Swap 8
Derivative [Line Items]
Notional Amount	25,000
Effective Start Date	Oct. 16, 2014
Maturity Date	Aug. 16, 2018
Pay Fixed Rate	1.5963%
Swap 8 | 1-Month LIBOR
Derivative [Line Items]
Variable rate spread (as a percentage)	0.13%
Interest rate caps
Derivative [Line Items]
Notional Amount	50,500
Cap 1
Derivative [Line Items]
Notional Amount	7,500	7,500
Effective Start Date	Jul. 01, 2012
Maturity Date	Jul. 01, 2017
Strike Rate	0.47%
Cap 1 | 3-Month LIBOR
Derivative [Line Items]
Variable rate spread (as a percentage)	4.00%
Cap 2
Derivative [Line Items]
Notional Amount	8,000	8,000
Effective Start Date	Jul. 07, 2012
Maturity Date	Jul. 07, 2017
Strike Rate	0.47%
Cap 2 | 3-Month LIBOR
Derivative [Line Items]
Variable rate spread (as a percentage)	3.10%
Cap 3
Derivative [Line Items]
Notional Amount	25,000		25,000
Effective Start Date	Sep. 15, 2014
Maturity Date	Sep. 15, 2019
Strike Rate	1.82%
Cap 3 | 3-Month LIBOR
Derivative [Line Items]
Variable rate spread (as a percentage)	1.32%
Cap 4
Derivative [Line Items]
Notional Amount	10,000		10,000
Effective Start Date	Sep. 30, 2014
Maturity Date	Sep. 30, 2019
Strike Rate	1.85%
Cap 4 | 3-Month LIBOR
Derivative [Line Items]
Variable rate spread (as a percentage)	2.80%
FHLB Advances | Interest rate swaps
Derivative [Line Items]
Notional Amount			100,000	75,000
Brokered Money Market Deposits | Interest rate swaps
Derivative [Line Items]
Number of interest rate swaps			2
Notional Amount			$ 50,000