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Balance Sheet Offsetting (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Offsetting Assets [Line Items] |  |  |
Derivative Asset, Not Offset | [1],[2] | $ 0 | $ 0
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Gross |  | 18,239 | 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 |  | 18,239 | 7,871
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Not Offset, Policy Election Deduction | [1] | 0 | 0
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Collateral, Obligation to Return Cash | [1] | (483) | (4,404)
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Amount Offset Against Collateral |  | 17,756 | 3,467
Derivative Liability, Not Offset | [1],[2] | 0 | 0
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Gross |  | 25,943 | 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 |  | 25,943 | 13,523
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Not Offset, Policy Election Deduction | [1] | 0 | 0
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Cash | [1] | 25,429 | 5,682
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Amount Offset Against Collateral |  | 514 | 7,841
Securities Sold under Agreements to Repurchase, Gross |  | 237,984 | 245,868
Securities Sold under Agreements to Repurchase, Asset |  | 0 | 0
Securities Sold under Agreements to Repurchase |  | 237,984 | 245,868
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Securities | [1] | 237,984 | 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 |  |  |
Offsetting Assets [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 17,242 | 4,374
Derivative Asset, Fair Value, Gross Liability |  | 0 | 0
Derivative Asset |  | 17,242 | 4,374
Derivative, Collateral, Obligation to Return Cash | [1] | 17,242 | (4,374)
Derivative, Collateral, Obligation to Return Cash |  | 0 | 0
Customer Loan Swap - Commercial Customer |  |  |
Offsetting Assets [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | [2] | 17,756 | 3,467
Derivative Asset, Fair Value, Gross Liability | [2] | 0 | 0
Derivative Asset | [2] | 17,756 | 3,467
Derivative, Collateral, Obligation to Return Cash | [1],[2] | 0 | 0
Derivative, Collateral, Obligation to Return Cash | [2] | 17,756 | 3,467
Derivative Liability, Fair Value, Gross Liability | [2] | 514 | 7,841
Derivative Liability, Fair Value, Gross Asset | [2] | 0 | 0
Derivative Liability | [2] | 514 | 7,841
Derivative, Collateral, Right to Reclaim Cash | [1],[2] | 0 | 0
Derivative Liability, Fair Value, Amount Offset Against Collateral | [2] | 514 | 7,841
Interest Rate Swap On Loans [Member] |  |  |
Offsetting Assets [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 483 |
Derivative Asset, Fair Value, Gross Liability |  | 0 |
Derivative Asset |  | 483 |
Derivative, Collateral, Obligation to Return Cash | [1] | (483) |
Derivative, Collateral, Obligation to Return Cash |  | 0 |
FHLBB Advance Interest Rate Swap |  |  |
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, Collateral, Obligation to Return Cash |  |  | 0
Junior Subordinated Debt Interest Rate Swap |  |  |
Offsetting Assets [Line Items] |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 8,187 | 5,682
Derivative Liability, Fair Value, Gross Asset |  | 0 | 0
Derivative Liability |  | 8,187 | 5,682
Derivative, Collateral, Right to Reclaim Cash | [1] | 8,187 | 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.
[2] | (2)The Company manages its net exposure on its commercial customer loan swaps by obtaining collateral as part of the normal loan policy and underwriting practices.

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