SECURITIES - Total Available for Sale and Held to Maturity Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Total securities
Amortized Cost	$ 851,503	$ 956,769
Gross Unrealized Gains	394	1,599
Gross Unrealized Losses	(30,791)	(18,567)
Total securities	$ 821,106	$ 939,801

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