Borrowed Funds (Maturity and weighted average interest rates of FHLB advances) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	2.17%	1.94%
FHLB advances	$ 320,000	$ 290,000
Fixed Rate Advances Due 2018 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	1.86%	1.96%
FHLB fixed rate advances	$ 20,000	$ 70,000
Fixed Rate Advances Due 2019 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	1.94%	1.87%
FHLB fixed rate advances	$ 100,000	$ 85,000
Fixed Rate Advances Due 2020 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	2.18%	1.80%
FHLB fixed rate advances	$ 55,000	$ 35,000
Fixed Rate Advances Due 2021 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	1.91%	1.91%
FHLB fixed rate advances	$ 50,000	$ 50,000
Federal Home Loan Bank, Advances, Variable Rate Due 2021 [Member] [Member] [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Advances, Floating Rate	$ 10,000	$ 10,000
FHLB advances, rate	2.62%	1.72%
Federal Home Loan Bank, Advances, Fixed Rate Due 2022 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	1.97%	1.97%
FHLB fixed rate advances	$ 20,000	$ 20,000
Fixed Rate Advances Due 2023 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	3.17%	3.90%
FHLB fixed rate advances	$ 35,000	$ 10,000
Federal Home Loan Bank, Advances, Fixed Rate Due 2024 [Member] [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	2.96%	0.00%
FHLB fixed rate advances	$ 20,000	$ 0
Federal Home Loan Bank, Advances, Fixed Rate Due 2026 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, rate	1.17%	1.17%
FHLB fixed rate advances	$ 10,000	$ 10,000