Short-Term Borrowings - Average Balances and Cost of Funds (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Average Balances	$ 123,444	$ 155,735	$ 217,547
Cost of Funds	2.43%	2.10%	1.22%
Federal Home Loan Bank short-term advances
Short-term Debt [Line Items]
Average Balances	$ 114,965	$ 147,749	$ 208,332
Cost of Funds	2.59%	2.21%	1.27%
Securities sold under agreements to repurchase
Short-term Debt [Line Items]
Average Balances	$ 8,479	$ 7,986	$ 9,215
Cost of Funds	0.15%	0.17%	0.17%