ACQUISITIONS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009	Nov. 09, 2012 Central Bankcorp, Inc. [Member]
Assets
Cash							$ 12,683
Investments							28,268
Loans							450,671
Premises and equipment							6,277
Goodwill	150,391	[1]	130,074	[1]	129,617	129,348	22,544
Core deposit intangible							2,150
Other assets							37,309
Total assets acquired							559,902
Liabilities
Deposits							357,434
Borrowings							144,920
Other liabilities							5,511
Total liabilities assumed							507,865
Purchase price							$ 52,037

[1] Approximately $38.3 million and $39.5 million is expected to be deductible for tax purposes at December 31, 2012 and 2011, respectively.