Income Taxes, Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Tax Provision at Federal Statutory Rate	$ 16,037	$ 15,510	$ 14,174
Interest on Obligations of States and Political Subdivisions exempt from Federal Taxation	(675)	(711)	(805)
State and Local Income Taxes, Net of Federal Income Tax Benefit	2,992	2,966	2,624
Bank Owned Life Insurance	(731)	(712)	(696)
Low-Income Housing Tax Credit	(1,201)	(291)	(126)
Bargain Purchase Gain	(641)	0	0
Other, Net	316	162	(77)
Total Provision for Taxes	$ 16,097	$ 16,924	$ 15,094
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	(1.50%)	(1.60%)	(2.00%)
State and Local Income Taxes, Net of Federal Income Tax Benefit	6.50%	6.70%	6.50%
Bank Owned Life Insurance	(1.60%)	(1.60%)	(1.70%)
Low-Income Housing Tax Credit	(2.60%)	(0.70%)	(0.30%)
Bargain Purchase Gain	(1.40%)	0.00%	0.00%
Other, Net	0.70%	0.40%	(0.20%)
Total Provision for Taxes	35.10%	38.20%	37.30%