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Derivatives and Balance Sheet Offsetting - Collateral pledged table (Details) - USD ($) $ in Thousands | Sep. 30, 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 | 26,966 | 64,437
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities | (26,966) | (64,437)
Securities sold under agreements to repurchase, amount not offset | 0 | 0
Interest Rate Contracts [Member] |  |
Balance Sheet Offsetting [Line Items] |  |
Derivative Assets, Gross Amounts Offset in the Balance Sheets | 0 | 0
Derivative Asset | 53,202 | 19,144
Derivative, Collateral, Obligation to Return Cash | 0 | 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 53,202 | 19,144
Derivative Liability, Gross Amounts Offset in Balance Sheets | 0 | 0
Derivative Liability | 53,677 | 19,145
Derivative, Collateral, Right to Reclaim Cash | 53,677 | 19,145
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Interest rate collar [Domain] |  |
Balance Sheet Offsetting [Line Items] |  |
Derivative Assets, Gross Amounts Offset in the Balance Sheets | 0 | 0
Derivative Asset | 35,668 | 14,727
Derivative, Collateral, Obligation to Return Cash | (35,668) | (14,727)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Available-for-sale Securities [Member] |  |
Balance Sheet Offsetting [Line Items] |  |
Securities Sold under Agreements to Repurchase, Gross | 26,966 | 64,437
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member] |  |
Balance Sheet Offsetting [Line Items] |  |
Fair value of asset derivative instruments | 53,202 | 19,144
Fair value of liability derivative instruments | 53,677 | 19,145
Designated as Hedging Instrument [Member] | Interest rate collar [Domain] |  |
Balance Sheet Offsetting [Line Items] |  |
Fair value of asset derivative instruments | $ 35,668 | $ 14,727

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