ACQUISITIONS (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Nov. 16, 2018	Dec. 31, 2017	May 12, 2017	Dec. 31, 2016
Assets
Goodwill	$ 256,105		$ 231,806		$ 221,526
Island Bancorp, Inc. [Member]
Assets
Cash				$ 11,137
Loans				155,551
Premises and equipment				5,828
Goodwill				10,280
Core deposit intangible				2,964
Other assets				4,629
Total assets acquired				190,389
Liabilities
Deposits				159,580
Borrowings				2,475
Other liabilities				18
Total liabilities assumed				162,073
Purchase price				$ 28,316
MNB Bancorp [Member]
Assets
Cash		$ 6,743
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Investments		25,358
Loans		293,498
Premises and equipment		1,904
Goodwill		24,299
Core deposit intangible		8,588
Other assets		8,639
Total assets acquired		369,029
Liabilities
Deposits		278,204
Borrowings		33,093
Other liabilities		1,609
Total liabilities assumed		312,906
Purchase price		$ 56,123