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Derivative Financial Instruments and Hedging Activities - Offsetting of Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ 1,178	$ 375
Gross Amounts Offset in the Statements of Condition	0	0
Net Amounts of Liabilities Presented in the Statements of Condition	1,178	375
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments	0	(161)
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Pledged	(1,178)	0
Net Amount	0	214
Other liabilities | Interest rate swap
Offsetting Liabilities [Line Items]
Derivative liabilities, accrued interest, interest rate swaps	$ 6	$ 3

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