Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (101)	[1]	$ (941)	[1]
Other comprehensive income (loss) before reclassifications	138	[1]	645	[1]
Amounts reclassified from accumulated other comprehensive income	0	[1]	0	[1]
Net current-period other comprehensive income (loss)	138	[1]	645	[1]
Ending balance	37	[1]	(296)	[1]
Gains and Losses on Cash Flow Hedges [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(200)	[1]	(147)	[1]
Other comprehensive income (loss) before reclassifications	(31)	[1]	(21)	[1]
Amounts reclassified from accumulated other comprehensive income	0	[1]	0	[1]
Net current-period other comprehensive income (loss)	(31)	[1]	(21)	[1]
Ending balance	(231)	[1]	(168)	[1]
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	160	[1]	(847)	[1]
Other comprehensive income (loss) before reclassifications	169	[1]	666	[1]
Amounts reclassified from accumulated other comprehensive income	0	[1]	0	[1]
Net current-period other comprehensive income (loss)	169	[1]	666	[1]
Ending balance	329	[1]	(181)	[1]
Supplemental Executive Retirement Plans [Member]
Changes In Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(61)	[1]	53	[1]
Other comprehensive income (loss) before reclassifications	0	[1]	0	[1]
Amounts reclassified from accumulated other comprehensive income	0	[1]	0	[1]
Net current-period other comprehensive income (loss)	0	[1]	0	[1]
Ending balance	$ (61)	[1]	$ 53	[1]

[1] All amounts are net of tax. Amounts in parentheses indicate debits.