ACQUISITIONS - Estimated FV of Assets Acquired & Liab Assumed(Details) - USD ($) $ in Thousands	Jun. 30, 2015	Feb. 20, 2015	Dec. 31, 2014
Assets
Goodwill	$ 201,083		$ 170,421
Peoples Federal Bancshares, Inc [Member]
Assets
Cash		$ 41,957
Investments		43,585
Loans		463,927
Premises and equipment		9,346
Goodwill		30,662
Core deposit intangible		3,936
Other assets		46,920
Total assets acquired		640,333
Liabilities
Deposits		432,250
Borrowings		51,209
Other liabilities		15,054
Total liabilities assumed		498,513
Purchase price		$ 141,820