Financial Derivatives (Interest Rate Swaps) (Details) - Interest rate swaps - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Long
Derivative [Line Items]
Notional Amount	$ 237,472	$ 253,423
Fair Value	4,344	8,329
Long | 2021 [Member]
Derivative [Line Items]
Notional Amount	12,950	12,950
Fair Value	103	205
Long | 2022 [Member]
Derivative [Line Items]
Notional Amount	53,974	103,974
Fair Value	887	1,413
Long | 2023 [Member]
Derivative [Line Items]
Notional Amount	41,407	48,657
Fair Value	1,423	2,209
Long | 2024 [Member]
Derivative [Line Items]
Notional Amount	76,342	86,342
Fair Value	2,959	4,567
Long | 2026 [Member]
Derivative [Line Items]
Notional Amount	47,799
Fair Value	(725)
Long | 2031
Derivative [Line Items]
Notional Amount	3,500
Fair Value	(38)
Long | 2035
Derivative [Line Items]
Notional Amount	500	500
Fair Value	(66)	(14)
Long | 2040
Derivative [Line Items]
Notional Amount	500	500
Fair Value	(85)	(20)
Long | 2050
Derivative [Line Items]
Notional Amount	500	500
Fair Value	$ (114)	$ (31)
Long | Weighted Average
Derivative [Line Items]
Pay Rate	1.54%	1.48%
Receive Rate	0.20%	0.22%
Remaining Years to Maturity	2 years 11 months 26 days	2 years 5 months 23 days
Long | Weighted Average | 2021 [Member]
Derivative [Line Items]
Pay Rate	1.75%	1.75%
Receive Rate	0.19%	0.24%
Remaining Years to Maturity	5 months 15 days	8 months 15 days
Long | Weighted Average | 2022 [Member]
Derivative [Line Items]
Pay Rate	1.85%	1.07%
Receive Rate	0.19%	0.22%
Remaining Years to Maturity	11 months 1 day	1 year 5 months 23 days
Long | Weighted Average | 2023 [Member]
Derivative [Line Items]
Pay Rate	2.00%	2.00%
Receive Rate	0.19%	0.24%
Remaining Years to Maturity	1 year 11 months 19 days	2 years 3 months 3 days
Long | Weighted Average | 2024 [Member]
Derivative [Line Items]
Pay Rate	1.57%	1.65%
Receive Rate	0.22%	0.22%
Remaining Years to Maturity	3 years 6 months 18 days	3 years 8 months 23 days
Long | Weighted Average | 2026 [Member]
Derivative [Line Items]
Pay Rate	0.69%
Receive Rate	0.18%
Remaining Years to Maturity	4 years 10 months 24 days
Long | Weighted Average | 2031
Derivative [Line Items]
Pay Rate	1.63%
Receive Rate	0.19%
Remaining Years to Maturity	9 years 11 months 12 days
Long | Weighted Average | 2035
Derivative [Line Items]
Pay Rate	0.74%	0.74%
Receive Rate	0.09%	0.09%
Remaining Years to Maturity	14 years 6 months 21 days	14 years 9 months 21 days
Long | Weighted Average | 2040
Derivative [Line Items]
Pay Rate	0.84%	0.84%
Receive Rate	0.09%	0.09%
Remaining Years to Maturity	19 years 6 months 25 days	19 years 9 months 25 days
Long | Weighted Average | 2050
Derivative [Line Items]
Pay Rate	0.90%	0.90%
Receive Rate	0.09%	0.09%
Remaining Years to Maturity	29 years 6 months 29 days	29 years 9 months 25 days
Short
Derivative [Line Items]
Notional Amount	$ 879,596	$ 408,295
Fair Value	(2,525)	(14,984)
Short | 2021 [Member]
Derivative [Line Items]
Notional Amount		17,500
Fair Value		(231)
Short | 2022 [Member]
Derivative [Line Items]
Notional Amount	64,100	96,533
Fair Value	(503)	(1,535)
Short | 2023 [Member]
Derivative [Line Items]
Notional Amount	361,650	146,012
Fair Value	(3,788)	(4,770)
Short | 2024 [Member]
Derivative [Line Items]
Notional Amount	251,700
Fair Value	669
Short | 2025 [Member]
Derivative [Line Items]
Notional Amount	38,192	66,503
Fair Value	(123)	(1,034)
Short | 2026 [Member]
Derivative [Line Items]
Notional Amount	10,000	11,216
Fair Value	49	(458)
Short | 2027 [Member]
Derivative [Line Items]
Notional Amount	9,732	9,732
Fair Value	464	60
Short | 2028 [Member]
Derivative [Line Items]
Notional Amount	51,644	16,644
Fair Value	(52)	(2,169)
Short | 2029 [Member]
Derivative [Line Items]
Notional Amount	19,152	22,744
Fair Value	(643)	(2,289)
Short | 2030 [Member]
Derivative [Line Items]
Notional Amount	11,085	13,015
Fair Value	572	(369)
Short | 2031
Derivative [Line Items]
Notional Amount	53,945
Fair Value	1,412
Short | 2035
Derivative [Line Items]
Notional Amount	500	500
Fair Value	67	15
Short | 2036 [Member]
Derivative [Line Items]
Notional Amount	1,100	1,100
Fair Value	84	(47)
Short | 2040
Derivative [Line Items]
Notional Amount	500	500
Fair Value	85	20
Short | 2049 [Member]
Derivative [Line Items]
Notional Amount	5,796	5,796
Fair Value	(932)	(2,208)
Short | 2050
Derivative [Line Items]
Notional Amount	500	500
Fair Value	$ 114	$ 31
Short | Weighted Average
Derivative [Line Items]
Pay Rate	0.79%	1.39%
Receive Rate	0.18%	0.23%
Remaining Years to Maturity	3 years 7 months 2 days	3 years 9 months 25 days
Short | Weighted Average | 2021 [Member]
Derivative [Line Items]
Pay Rate		2.75%
Receive Rate		0.24%
Remaining Years to Maturity		2 months 19 days
Short | Weighted Average | 2022 [Member]
Derivative [Line Items]
Pay Rate	0.99%	1.19%
Receive Rate	0.18%	0.22%
Remaining Years to Maturity	11 months 4 days	1 year 1 month 20 days
Short | Weighted Average | 2023 [Member]
Derivative [Line Items]
Pay Rate	0.74%	1.50%
Receive Rate	0.19%	0.23%
Remaining Years to Maturity	2 years	2 years 5 months 1 day
Short | Weighted Average | 2024 [Member]
Derivative [Line Items]
Pay Rate	0.38%
Receive Rate	0.16%
Remaining Years to Maturity	2 years 11 months 8 days
Short | Weighted Average | 2025 [Member]
Derivative [Line Items]
Pay Rate	0.92%	0.73%
Receive Rate	0.18%	0.21%
Remaining Years to Maturity	4 years 2 months 15 days	4 years 9 months
Short | Weighted Average | 2026 [Member]
Derivative [Line Items]
Pay Rate	0.90%	1.23%
Receive Rate	0.19%	0.25%
Remaining Years to Maturity	4 years 11 months 1 day	5 years 6 months
Short | Weighted Average | 2027 [Member]
Derivative [Line Items]
Pay Rate	0.49%	0.49%
Receive Rate	0.19%	0.24%
Remaining Years to Maturity	6 years 2 months 26 days	6 years 5 months 23 days
Short | Weighted Average | 2028 [Member]
Derivative [Line Items]
Pay Rate	1.40%	2.39%
Receive Rate	0.19%	0.24%
Remaining Years to Maturity	6 years 11 months 12 days	7 years 3 months 25 days
Short | Weighted Average | 2029 [Member]
Derivative [Line Items]
Pay Rate	1.98%	1.94%
Receive Rate	0.20%	0.23%
Remaining Years to Maturity	8 years 3 months 18 days	8 years 7 months 9 days
Short | Weighted Average | 2030 [Member]
Derivative [Line Items]
Pay Rate	1.06%	1.13%
Receive Rate	0.19%	0.22%
Remaining Years to Maturity	9 years 29 days	9 years 3 months 14 days
Short | Weighted Average | 2031
Derivative [Line Items]
Pay Rate	1.46%
Receive Rate	0.15%
Remaining Years to Maturity	9 years 11 months 1 day
Short | Weighted Average | 2035
Derivative [Line Items]
Pay Rate	0.78%	0.78%
Receive Rate	0.09%	0.09%
Remaining Years to Maturity	14 years 6 months 21 days	14 years 9 months 21 days
Short | Weighted Average | 2036 [Member]
Derivative [Line Items]
Pay Rate	1.45%	1.45%
Receive Rate	0.19%	0.25%
Remaining Years to Maturity	14 years 10 months 20 days	15 years 1 month 17 days
Short | Weighted Average | 2040
Derivative [Line Items]
Pay Rate	0.90%	0.90%
Receive Rate	0.09%	0.09%
Remaining Years to Maturity	19 years 6 months 25 days	19 years 9 months 25 days
Short | Weighted Average | 2049 [Member]
Derivative [Line Items]
Pay Rate	2.89%	2.89%
Receive Rate	0.24%	0.23%
Remaining Years to Maturity	27 years 9 months 10 days	28 years 7 days
Short | Weighted Average | 2050
Derivative [Line Items]
Pay Rate	0.98%	0.98%
Receive Rate	0.09%	0.09%
Remaining Years to Maturity	29 years 6 months 29 days	29 years 9 months 25 days