Investments (Amortized Cost And Fair Values Classified By Contractual Maturity Date) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Investments [Line Items]
Amortized Cost: Due after five years through ten years	$ 59,452
Amortized Cost: Due after ten years	81,183
Amortized Cost: Sub Total	140,635
Fair Value: Due after five years through ten years	60,636
Fair Value: Due after ten years	59,081
Available For Sale Debt Maturities Fair Value Sub Total	119,717
Available-for-sale Securities, Amortized Cost Basis	260,055	245,106
Available-for-sale Securities	239,440	223,273
Amortized Cost: Due after ten years	4,040
Fair Value: Due after ten years	4,318
Residential mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Amortized Cost: without Single Maturity Date	81,432
Fair Value: without Single Maturity Date	81,418
Available-for-sale Securities, Amortized Cost Basis	81,432	43,596
Available-for-sale Securities	81,418	44,108
Commercial mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Amortized Cost: without Single Maturity Date	14,934
Fair Value: without Single Maturity Date	15,026
Available-for-sale Securities, Amortized Cost Basis	14,934	37,330
Available-for-sale Securities	15,026	37,618
Collateralized mortgage obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost: without Single Maturity Date	23,054
Fair Value: without Single Maturity Date	23,279
Available-for-sale Securities, Amortized Cost Basis	23,054	31,836
Available-for-sale Securities	$ 23,279	$ 31,731