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Derivatives and Balance Sheet Offsetting Balance Sheet Offsetting (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Balance Sheet Offsetting [Line Items] |  |
Repurchase agreements, amounts offset in balance sheet | $ 0 | $ 0
repurchase agreements, net amount presented in statement of financial position | 61,094 | 79,059
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities | (61,094) | (79,059)
securities sold under agreements to repurchase, amount not offset | 0 | 0
Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement | 61,094 |
Interest Rate Contracts [Member] |  |
Balance Sheet Offsetting [Line Items] |  |
Derivative Assets, Gross Amounts Offset in the Balance Sheets | 0 | 0
Derivative Asset | 7,033 | 6,707
Derivative, Collateral, Obligation to Return Securities | 0 | 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 7,033 | 6,707
Derivative Liability, Gross Amounts Offset in Balance Sheets | 0 | 0
Derivative Liability | 7,033 | 6,714
Derivative, Collateral, Right to Reclaim Securities | (3,235) | (6,714)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 3,798 | 0
Available-for-sale Securities [Member] |  |
Balance Sheet Offsetting [Line Items] |  |
Assets Sold under Agreements to Repurchase, Term, Carrying Amounts | 25,000 |
Assets Sold under Agreements to Repurchase, Carrying Amount | $ 61,094 | $ 79,059

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