Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Held-to-maturity Securities [Line Items]
Carrying value	$ 5,399		$ 5,399		$ 0
Cost or amortized cost	5,399		5,399		0
Fair value	5,400		5,400		0
Schedule of Trading Securities and Other Trading Assets [Line Items]
Carrying Value	77		77		212
Cost or amortized cost	83	0	83	0	224
Fair Value	77	0	77	0	212
Gross unrealized gains (losses) on investment securities held to maturity [Abstract]
Gross unrealized gains (losses)	1		1		0
Unrealized gains (losses) on investment securities [Abstract]
Cost basis	83	0	83	0	224
Current value	77	0	77	0	212
Unrealized gains (losses)	(6)	0	(6)	0
Realized gains (losses) on investment securities [Abstract]
Net sale proceeds	272	435	505	552
Cost basis	(263)	(426)	(480)	(537)
Realized gains (losses)	9	9	25	15
Equity Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Carrying Value	77		77		212
Cost or amortized cost	83		83		224
Fair Value	77		77		212
Unrealized gains (losses) on investment securities [Abstract]
Cost basis	83		83		224
Current value	77		77		212
US Treasury Bills [Member]
Held-to-maturity Securities [Line Items]
Carrying value	5,399		5,399		0
Cost or amortized cost	5,399		5,399		0
Fair value	$ 5,400		$ 5,400		$ 0