Borrowed Funds (Borrowed funds obligations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Schedule of Debt [Line Items]
Borrowed funds	$ 277,386		$ 277,386		$ 340,299
Borrowed funds, Rate	2.08%		2.08%		1.95%
Securities Sold under Agreements to Repurchase [Member]
Schedule of Debt [Line Items]
Short-term Debt, Maximum Month-end Outstanding Amount	$ 32,386	$ 40,346	$ 37,441	$ 40,346
Borrowed funds	$ 32,386		$ 32,386		$ 40,299
Borrowed funds, Rate	0.11%		0.11%		0.11%
Federal Funds Purchased [Member]
Schedule of Debt [Line Items]
Short-term Debt, Maximum Month-end Outstanding Amount	$ 0	$ 0	$ 7,070	$ 16,200
Federal Home Loan Bank Advances [Member]
Schedule of Debt [Line Items]
Borrowed funds	$ 245,000		$ 245,000		$ 300,000
Borrowed funds, Rate	2.34%		2.34%		2.20%