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Derivatives and balance Sheet Offsetting - Collateral pledged table (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Balance Sheet Offsetting [Line Items] |  |
Repurchase agreements, amounts offset in balance sheet | $ 0 | $ 0
repurchase agreements, net amount presented in statement of financial position | 73,859 | 64,437
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities | (73,859) | (64,437)
securities sold under agreements to repurchase, amount not offset | 0 | 0
Interest Rate Contracts |  |
Balance Sheet Offsetting [Line Items] |  |
Derivative Assets, Gross Amounts Offset in the Balance Sheets | 0 | 0
Derivative Assets | 46,184 | 19,144
Derivative, Collateral, Obligation to Return Securities | 0 | 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 46,184 | 19,144
Derivative Liability, Gross Amounts Offset in Balance Sheets | 0 | 0
Derivative Liabilities | 46,637 | 19,145
Derivative, Collateral, Right to Reclaim Securities | (46,637) | (19,145)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Interest rate collar |  |
Balance Sheet Offsetting [Line Items] |  |
Derivative Assets, Gross Amounts Offset in the Balance Sheets |  | 0
Derivative Assets |  | 14,727
Derivative Asset, Fair Value, Amount Not Offset Against Collateral |  | 0
Derivative, Collateral, Obligation to Return Cash |  | (14,727)
Not Designated as Hedging Instrument | Interest Rate Contracts | Other Assets |  |
Balance Sheet Offsetting [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 46,184 | 19,144
Not Designated as Hedging Instrument | Interest Rate Contracts | Other Liabilities |  |
Balance Sheet Offsetting [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | 46,637 | 19,145
Designated as Hedging Instrument | Interest rate collar | Other Assets |  |
Balance Sheet Offsetting [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 0 | 14,727
Designated as Hedging Instrument | Interest rate collar | Other Liabilities |  |
Balance Sheet Offsetting [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Available-for-sale Securities |  |
Balance Sheet Offsetting [Line Items] |  |
Assets Sold under Agreements to Repurchase, Carrying Amount | $ 73,859 | $ 64,437

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