Income Taxes, Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Tax Provision at Federal Statutory Rate	$ 15,510	$ 14,174	$ 13,399
Interest on Obligations of States and Political Subdivisions exempt from Federal Taxation	(711)	(805)	(894)
State and Local Income Taxes, Net of Federal Income Tax Benefit	2,966	2,624	2,419
Bank Owned Life Insurance	(712)	(696)	(702)
Low-Income Housing Tax Credit	(291)	(126)	(129)
Other, Net	162	(77)	128
Total Provision for Taxes	$ 16,924	$ 15,094	$ 14,221
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Tax Provision at Federal Statutory Rate	35.00%	35.00%	35.00%
Interest on Obligations of States and Political Subdivisions exempt from Federal Taxation	(1.60%)	(2.00%)	(2.40%)
State and Local Income Taxes, Net of Federal Income Tax Benefit	6.70%	6.50%	6.30%
Bank Owned Life Insurance	(1.60%)	(1.70%)	(1.80%)
Low-Income Housing Tax Credit	(0.70%)	(0.30%)	(0.30%)
Other, Net	0.40%	(0.20%)	0.30%
Total Provision for Taxes	38.20%	37.30%	37.10%