Income Taxes Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Computed Tax Expense at Statutory Rate	$ 12,345	$ 11,737	$ 10,806
Tax-Exempt Income	(2,292)	(2,215)	(2,238)
Nondeductible Interest Expense	36	51	80
State Taxes, Net of Federal Income Tax Benefit	805	791	633
Other Items, Net	(284)	(190)	(202)
Income Tax Expense (Benefit), Continuing Operations	$ 10,610	$ 10,174	$ 9,079