BALANCE SHEET OFFSETTING (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Offsetting Assets [Line Items]
Derivative Asset, Not Offset, Policy Election Deduction		$ 0	$ 0
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Gross		17,405	7,871
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Liability		0	0
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed		17,405	7,871
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Not Offset, Policy Election Deduction		0	0
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Collateral, Obligation to Return Cash	[1]	0	(4,404)
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Amount Offset Against Collateral	[1]	17,405	3,467
Derivative Liability, Not Offset, Policy Election Deduction		0	0
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Gross		25,449	13,523
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Asset		0	0
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned		8,847	13,523
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Not Offset, Policy Election Deduction		0	0
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Cash	[1]	24,908	5,682
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Amount Offset Against Collateral	[1]	541	7,841
Securities Sold under Agreements to Repurchase, Gross		241,647	245,868
Securities Sold under Agreements to Repurchase, Asset		0	0
Securities Sold under Agreements to Repurchase		241,647	245,868
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Securities		241,647	245,868
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	[1]	0	0
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	[1]	0	0
Customer Loan Swap Dealer Bank [Member]
Offsetting Assets [Line Items]
Derivative Asset, Fair Value, Gross Asset			4,374
Derivative Asset, Fair Value, Gross Liability			0
Derivative Asset			4,374
Derivative, Collateral, Obligation to Return Cash	[1]		(4,374)
Derivative Asset, Fair Value, Amount Offset Against Collateral	[1]		0
Derivative Liability, Fair Value, Gross Liability		16,602
Derivative Liability, Fair Value, Gross Asset		0
Derivative Liability		16,602
Derivative Liability, Not Offset, Policy Election Deduction		0
Derivative, Collateral, Right to Reclaim Cash	[1]	16,602
Derivative Liability, Fair Value, Amount Offset Against Collateral	[1]	0
Customer Loan Swaps Commercial Customer [Member]
Offsetting Assets [Line Items]
Derivative Asset, Fair Value, Gross Asset		17,143	3,467
Derivative Asset, Fair Value, Gross Liability		0	0
Derivative Asset		17,143	3,467
Derivative, Collateral, Obligation to Return Cash	[1]	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	[1]	17,143	3,467
Derivative Liability, Fair Value, Gross Liability		541	7,841
Derivative Liability, Fair Value, Gross Asset		0	0
Derivative Liability		541	7,841
Derivative, Collateral, Right to Reclaim Cash	[1]	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	[1]	541	7,841
Interest Rate Swap On Loans [Member]
Offsetting Assets [Line Items]
Derivative Asset, Fair Value, Gross Asset		262
Derivative Asset, Fair Value, Gross Liability		0
Derivative Asset		262
Derivative, Collateral, Obligation to Return Cash	[1]	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	[1]	262
FHLBB Advance Interest Rate Swap [Member]
Offsetting Assets [Line Items]
Derivative Asset, Fair Value, Gross Asset			30
Derivative Asset, Fair Value, Gross Liability			0
Derivative Asset			30
Derivative, Collateral, Obligation to Return Cash	[1]		(30)
Derivative Asset, Fair Value, Amount Offset Against Collateral	[1]		0
Junior Subordinated Debt Interest Rate Swap [Member]
Offsetting Assets [Line Items]
Derivative Liability, Fair Value, Gross Liability		8,306	5,682
Derivative Liability, Fair Value, Gross Asset		0	0
Derivative Liability		8,306	5,682
Derivative, Collateral, Right to Reclaim Cash	[1]	8,306	5,682
Derivative Liability, Fair Value, Amount Offset Against Collateral	[1]	$ 0	$ 0

[1] (1) The amount presented was the lesser of the amount pledged (received) or the net amount presented in the consolidated statements of condition.