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BALANCE SHEET OFFSETTING (Details) - USD ($) $ in Thousands | Sep. 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 |  | 25,767 | 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 |  | 25,767 | 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] | (1,507) | (4,404)
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Amount Offset Against Collateral |  | 24,260 | 3,467
Derivative Liability, Not Offset, Policy Election Deduction |  | 0 | 0
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Gross |  | 33,862 | 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 |  | 33,862 | 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] | 33,860 | 5,682
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Amount Offset Against Collateral |  | 2 | 7,841
Securities Sold under Agreements to Repurchase, Gross |  | 273,454 | 245,868
Securities Sold under Agreements to Repurchase, Asset |  | 0 | 0
Securities Sold under Agreements to Repurchase |  | 273,454 | 245,868
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Securities |  | 273,454 | 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 |  | 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 |  |  | 0
Derivative Liability, Fair Value, Gross Liability |  | 24,258 |
Derivative Liability, Fair Value, Gross Asset |  | 0 |
Derivative Liability |  | 24,258 |
Derivative Liability, Not Offset, Policy Election Deduction |  | 0 |
Derivative, Collateral, Right to Reclaim Cash | [1] | 24,258 |
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | 0 |
Customer Loan Swaps Commercial Customer [Member] |  |  |
Offsetting Assets [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 24,260 | 3,467
Derivative Asset, Fair Value, Gross Liability |  | 0 | 0
Derivative Asset |  | 24,260 | 3,467
Derivative, Collateral, Obligation to Return Cash | [1] | 0 | 0
Derivative Asset, Fair Value, Amount Offset Against Collateral |  | 24,260 | 3,467
Derivative Liability, Fair Value, Gross Liability |  | 2 | 7,841
Derivative Liability, Fair Value, Gross Asset |  | 0 | 0
Derivative Liability |  | 2 | 7,841
Derivative, Collateral, Right to Reclaim Cash | [1] | 0 | 0
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | 2 | 7,841
Interest Rate Swap On Loans [Member] |  |  |
Offsetting Assets [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 1,507 |
Derivative Asset, Fair Value, Gross Liability |  | 0 |
Derivative Asset |  | 1,507 |
Derivative, Collateral, Obligation to Return Cash | [1] | (1,507) |
Derivative Asset, Fair Value, Amount Offset Against Collateral |  | 0 |
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 |  |  | 0
Junior Subordinated Debt Interest Rate Swap [Member] |  |  |
Offsetting Assets [Line Items] |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 9,602 | 5,682
Derivative Liability, Fair Value, Gross Asset |  | 0 | 0
Derivative Liability |  | 9,602 | 5,682
Derivative, Collateral, Right to Reclaim Cash | [1] | 9,602 | 5,682
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | $ 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.

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