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Derivative Financial Instruments and Hedging Activities - Offsetting of Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 161	$ 74
Offset in the Statements of Condition	0	0
Net Amounts of Assets Presented in the Statements of Condition	161	74
Derivative, Collateral, Obligation to Return Securities	(161)	(74)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Received	0	0
Net Amount	0	0
Other assets | Interest rate swap
Offsetting Assets [Line Items]
Derivative assets, accrued interest, interest rate swaps	1	1
Counterparty A
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	161	74
Offset in the Statements of Condition	0	0
Net Amounts of Assets Presented in the Statements of Condition	161	74
Derivative, Collateral, Obligation to Return Securities	(161)	(74)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Received	0	0
Net Amount	$ 0	$ 0

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