Financial Derivatives (Interest Rate Swaps) (Details) - Interest rate swaps $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Long
Derivative [Line Items]
Notional Amount	$ 305,723
Fair Value	1,348
Long | 2021 [Member]
Derivative [Line Items]
Notional Amount	181,950
Fair Value	(49)
Long | 2022 [Member]
Derivative [Line Items]
Notional Amount	53,974
Fair Value	441
Long | 2023 [Member]
Derivative [Line Items]
Notional Amount	48,657
Fair Value	709
Long | 2024 [Member]
Derivative [Line Items]
Notional Amount	11,342
Fair Value	306
Long | 2029 [Member]
Derivative [Line Items]
Notional Amount	9,800
Fair Value	$ (59)
Long | Weighted Average
Derivative [Line Items]
Pay Rate	1.78%
Receive Rate	1.91%
Remaining Years to Maturity	2 years 5 months 19 days
Long | Weighted Average | 2021 [Member]
Derivative [Line Items]
Pay Rate	1.67%
Receive Rate	1.89%
Remaining Years to Maturity	1 year 10 months 2 days
Long | Weighted Average | 2022 [Member]
Derivative [Line Items]
Pay Rate	1.85%
Receive Rate	1.91%
Remaining Years to Maturity	2 years 2 months 1 day
Long | Weighted Average | 2023 [Member]
Derivative [Line Items]
Pay Rate	2.00%
Receive Rate	1.92%
Remaining Years to Maturity	3 years 3 months 3 days
Long | Weighted Average | 2024 [Member]
Derivative [Line Items]
Pay Rate	2.33%
Receive Rate	2.09%
Remaining Years to Maturity	4 years 2 months 23 days
Long | Weighted Average | 2029 [Member]
Derivative [Line Items]
Pay Rate	1.78%
Receive Rate	1.91%
Remaining Years to Maturity	9 years 9 months 7 days
Short
Derivative [Line Items]
Notional Amount	$ 732,961
Fair Value	(4,599)
Short | 2020 [Member]
Derivative [Line Items]
Notional Amount	68,607
Fair Value	(234)
Short | 2021 [Member]
Derivative [Line Items]
Notional Amount	268,929
Fair Value	(419)
Short | 2022 [Member]
Derivative [Line Items]
Notional Amount	31,350
Fair Value	9
Short | 2023 [Member]
Derivative [Line Items]
Notional Amount	101,012
Fair Value	(1,265)
Short | 2024 [Member]
Derivative [Line Items]
Notional Amount	13,000
Fair Value	99
Short | 2025 [Member]
Derivative [Line Items]
Notional Amount	12,800
Fair Value	(24)
Short | 2026 [Member]
Derivative [Line Items]
Notional Amount	59,902
Fair Value	1,946
Short | 2028 [Member]
Derivative [Line Items]
Notional Amount	32,942
Fair Value	(1,634)
Short | 2029 [Member]
Derivative [Line Items]
Notional Amount	136,838
Fair Value	(2,018)
Short | 2030 [Member]
Derivative [Line Items]
Notional Amount	685
Fair Value	(32)
Short | 2036 [Member]
Derivative [Line Items]
Notional Amount	1,100
Fair Value	87
Short | 2049 [Member]
Derivative [Line Items]
Notional Amount	5,796
Fair Value	$ (1,114)
Short | Weighted Average
Derivative [Line Items]
Pay Rate	1.83%
Receive Rate	1.94%
Remaining Years to Maturity	4 years 3 months 21 days
Short | Weighted Average | 2020 [Member]
Derivative [Line Items]
Pay Rate	1.74%
Receive Rate	1.93%
Remaining Years to Maturity	5 hours
Short | Weighted Average | 2021 [Member]
Derivative [Line Items]
Pay Rate	1.73%
Receive Rate	1.95%
Remaining Years to Maturity	1 year 7 months 20 days
Short | Weighted Average | 2022 [Member]
Derivative [Line Items]
Pay Rate	1.65%
Receive Rate	1.93%
Remaining Years to Maturity	2 years 1 month 20 days
Short | Weighted Average | 2023 [Member]
Derivative [Line Items]
Pay Rate	2.06%
Receive Rate	1.91%
Remaining Years to Maturity	3 years 3 months 14 days
Short | Weighted Average | 2024 [Member]
Derivative [Line Items]
Pay Rate	1.56%
Receive Rate	1.89%
Remaining Years to Maturity	4 years 10 months 24 days
Short | Weighted Average | 2025 [Member]
Derivative [Line Items]
Remaining Years to Maturity	5 years 2 months 19 days
Short | Weighted Average | 2026 [Member]
Derivative [Line Items]
Pay Rate	1.24%
Receive Rate	1.94%
Remaining Years to Maturity	6 years 6 months
Short | Weighted Average | 2028 [Member]
Derivative [Line Items]
Pay Rate	2.40%
Receive Rate	1.93%
Remaining Years to Maturity	8 years 4 months 2 days
Short | Weighted Average | 2029 [Member]
Derivative [Line Items]
Pay Rate	2.02%
Receive Rate	1.96%
Remaining Years to Maturity	9 years 7 months 9 days
Short | Weighted Average | 2030 [Member]
Derivative [Line Items]
Pay Rate	2.38%
Receive Rate	1.90%
Remaining Years to Maturity	10 years 10 months 24 days
Short | Weighted Average | 2036 [Member]
Derivative [Line Items]
Pay Rate	1.45%
Receive Rate	1.94%
Remaining Years to Maturity	16 years 1 month 20 days
Short | Weighted Average | 2049 [Member]
Derivative [Line Items]
Pay Rate	2.89%
Receive Rate	2.09%
Remaining Years to Maturity	29 years 10 days
Forward-starting interest rate swap [Member] | Short
Derivative [Line Items]
Notional Amount	$ 20,900
Fair Value	$ (41)
Derivative fixed interest rate including forward-starting swaps	1.83%