ESTIMATED FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets measured at fair value on recurring basis
Available for sale securities	$ 800,203	$ 587,184
U.S. GSE securities
Assets measured at fair value on recurring basis
Available for sale securities	62,674	95,425
State and municipal obligations
Assets measured at fair value on recurring basis
Available for sale securities	87,935	63,693
U.S. GSE residential mortgage-backed securities
Assets measured at fair value on recurring basis
Available for sale securities	200,264	101,425
U.S. GSE residential collateralized mortgage obligations
Assets measured at fair value on recurring basis
Available for sale securities	317,878	258,599
U.S. GSE commercial mortgage-backed securities
Assets measured at fair value on recurring basis
Available for sale securities	12,418	2,945
U.S. GSE commercial collateralized mortgage obligations
Assets measured at fair value on recurring basis
Available for sale securities	64,198	24,082
Other asset backed securities
Assets measured at fair value on recurring basis
Available for sale securities	22,371	23,037
Corporate bonds
Assets measured at fair value on recurring basis
Available for sale securities	32,465	17,978
Carrying Value
Assets measured at fair value on recurring basis
Available for sale securities	800,203	587,184
Financial Assets: Derivatives	779	280
Recurring basis | Carrying Value
Assets measured at fair value on recurring basis
Available for sale securities	800,203	587,184
Recurring basis | Carrying Value | U.S. GSE securities
Assets measured at fair value on recurring basis
Available for sale securities	62,674	95,425
Recurring basis | Carrying Value | State and municipal obligations
Assets measured at fair value on recurring basis
Available for sale securities	87,935	63,693
Recurring basis | Carrying Value | U.S. GSE residential mortgage-backed securities
Assets measured at fair value on recurring basis
Available for sale securities	200,264	101,425
Recurring basis | Carrying Value | U.S. GSE residential collateralized mortgage obligations
Assets measured at fair value on recurring basis
Available for sale securities	317,878	258,599
Recurring basis | Carrying Value | U.S. GSE commercial mortgage-backed securities
Assets measured at fair value on recurring basis
Available for sale securities	12,418	2,945
Recurring basis | Carrying Value | U.S. GSE commercial collateralized mortgage obligations
Assets measured at fair value on recurring basis
Available for sale securities	64,198	24,082
Recurring basis | Carrying Value | Other asset backed securities
Assets measured at fair value on recurring basis
Available for sale securities	22,371	23,037
Recurring basis | Carrying Value | Corporate bonds
Assets measured at fair value on recurring basis
Available for sale securities	32,465	17,978
Recurring basis | Carrying Value | Derivatives
Assets measured at fair value on recurring basis
Financial Assets: Derivatives	779	280
Financial Liabilities:
Financial Liabilities: Derivatives	$ 2,073	$ 1,223
Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1) | U.S. GSE securities
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1) | State and municipal obligations
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1) | U.S. GSE residential mortgage-backed securities
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1) | U.S. GSE residential collateralized mortgage obligations
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1) | U.S. GSE commercial mortgage-backed securities
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1) | U.S. GSE commercial collateralized mortgage obligations
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1) | Other asset backed securities
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1) | Corporate bonds
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1) | Derivatives
Assets measured at fair value on recurring basis
Financial Assets: Derivatives
Financial Liabilities:
Financial Liabilities: Derivatives
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets measured at fair value on recurring basis
Available for sale securities	$ 800,203	$ 587,184
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. GSE securities
Assets measured at fair value on recurring basis
Available for sale securities	62,674	95,425
Recurring basis | Significant Other Observable Inputs (Level 2) | State and municipal obligations
Assets measured at fair value on recurring basis
Available for sale securities	87,935	63,693
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. GSE residential mortgage-backed securities
Assets measured at fair value on recurring basis
Available for sale securities	200,264	101,425
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. GSE residential collateralized mortgage obligations
Assets measured at fair value on recurring basis
Available for sale securities	317,878	258,599
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. GSE commercial mortgage-backed securities
Assets measured at fair value on recurring basis
Available for sale securities	12,418	2,945
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. GSE commercial collateralized mortgage obligations
Assets measured at fair value on recurring basis
Available for sale securities	64,198	24,082
Recurring basis | Significant Other Observable Inputs (Level 2) | Other asset backed securities
Assets measured at fair value on recurring basis
Available for sale securities	22,371	23,037
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate bonds
Assets measured at fair value on recurring basis
Available for sale securities	32,465	17,978
Recurring basis | Significant Other Observable Inputs (Level 2) | Derivatives
Assets measured at fair value on recurring basis
Financial Assets: Derivatives	779	280
Financial Liabilities:
Financial Liabilities: Derivatives	$ 2,073	$ 1,223
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Significant Unobservable Inputs (Level 3) | U.S. GSE securities
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Significant Unobservable Inputs (Level 3) | State and municipal obligations
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Significant Unobservable Inputs (Level 3) | U.S. GSE residential mortgage-backed securities
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Significant Unobservable Inputs (Level 3) | U.S. GSE residential collateralized mortgage obligations
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Significant Unobservable Inputs (Level 3) | U.S. GSE commercial mortgage-backed securities
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Significant Unobservable Inputs (Level 3) | U.S. GSE commercial collateralized mortgage obligations
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Significant Unobservable Inputs (Level 3) | Other asset backed securities
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate bonds
Assets measured at fair value on recurring basis
Available for sale securities
Recurring basis | Significant Unobservable Inputs (Level 3) | Derivatives
Assets measured at fair value on recurring basis
Financial Assets: Derivatives
Financial Liabilities:
Financial Liabilities: Derivatives