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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