Income Taxes, Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Tax Provision at Federal Statutory Rate									$ 16,370	$ 15,816	$ 12,543
Interest on Obligations of States and Political Subdivisions exempt from Federal Taxation									(350)	(358)	(338)
State and Local Income Taxes, Net of Federal Income Tax Benefit									6,445	6,304	4,791
Bank Owned Life Insurance									(444)	(460)	(434)
Low-Income Housing Tax Credit									(2,655)	(2,078)	(1,624)
Out of Period Adjustment									0	0	(802)
Other, Net									(149)	53	67
Total Provision for Taxes	$ 5,298	$ 4,945	$ 4,533	$ 4,441	$ 5,037	$ 4,660	$ 4,903	$ 4,677	$ 19,217	$ 19,277	$ 14,203
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Tax Provision at Federal Statutory Rate									21.00%	21.00%	21.00%
Interest on Obligations of States and Political Subdivisions exempt from Federal Taxation									(0.40%)	(0.50%)	(0.50%)
State and Local Income Taxes, Net of Federal Income Tax Benefit									8.30%	8.40%	7.90%
Bank Owned Life Insurance									(0.60%)	(0.60%)	(0.70%)
Low-Income Housing Tax Credit									(3.40%)	(2.80%)	(2.70%)
Out of Period Adjustment									0.00%	0.00%	(1.30%)
Other, Net									(0.20%)	0.10%	0.10%
Total Provision for Taxes									24.70%	25.60%	23.80%