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ACQUISITIONS - Pro Forma Information (Details) - SI Financial Group, Inc. - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Net interest income	$ 195,624	$ 202,709
Non-interest income	43,732	44,228
Income available to common shareholders	$ 60,357	$ 67,666

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