SECURITIES - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	May. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Proceeds from Sale of Available-for-sale Securities, Debt				$ 0	$ 4,061,000
Available-for-sale Securities, Gross Realized Gains					17,000
Collateral Underlying Mortgage Investments Terms				30- and 15-year fixed and 10/1 adjustable rate mortgage
Federal Home Loan Bank Stock and Federal Reserve Bank Stock		$ 16,000,000		$ 16,000,000
Cost Method Investments, Fair Value Disclosure		16,000,000		16,000,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		510,688,000		510,688,000		$ 527,682,000
Accumulated unrealized losses		(7,995,000)		(7,995,000)		$ (10,026,000)
Securities Available For Sale Transferred To Held-To-Maturity	$ 158,800,000
Available For Sale Securities Transferred To Held To Maturity Securities Unrealized Gain Loss	$ 3,100,000	0	$ (3,137,000)	0	$ (3,137,000)
Mortgage Backed Securities And Collateralized Mortgage Obligations Of Us Government Sponsored Entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		323,000,000		323,000,000
Accumulated unrealized losses		5,600,000		5,600,000
Mortgage Backed Securities And Collateralized Mortgage Obligations Of Us Government Sponsored Entities [Member] | Carrying Amount [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities pledged as collateral		157,700,000		157,700,000
Collateralized Mortgage Backed Securities [Member] | Carrying Amount [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities pledged as collateral		188,300,000		188,300,000
Collateralized Mortgage Backed Securities [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities pledged as collateral		187,700,000		187,700,000
Collateralized Loan Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		62,000,000		62,000,000
Accumulated unrealized losses		600,000		600,000
Private Collateralized Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		77,500,000		77,500,000
Accumulated unrealized losses		$ 1,300,000		$ 1,300,000