Income Taxes Income Tax Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Effective Income Tax Rate [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%
Expected income taxes	$ 8,249	$ 7,852	$ 6,265
Tax-exempt income	(877)	(761)	(618)
Nondeductible interest expense	9	14	16
State taxes, net of federal taxes	1,429	1,264	914
Other items	36	41	52
Effect of marginal tax rate	0	0	(100)
Total	$ 8,846	$ 8,410	$ 6,529
Former Rate [Member]
Effective Income Tax Rate [Line Items]
Effective State Statutory Income Tax Rate			7.30%
Current Rate [Member]
Effective Income Tax Rate [Line Items]
Effective State Statutory Income Tax Rate			9.50%