SECURITIES - Total Available for Sale and Held to Maturity Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Total securities
Amortized Cost	$ 750,884	$ 857,544
Gross Unrealized Gains	7,526	1,426
Gross Unrealized Losses	(6,201)	(21,292)
Total securities	$ 752,209	$ 837,678

The cost of debt securities, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined) and fair value hedge accounting adjustments, if any.

No definition available.

Name:	bdge_DebtSecuritiesAvailableForSaleAndHeldToMaturityAmortizedCost
Namespace Prefix:	bdge_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant