Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Held-to-maturity Securities [Line Items]
Carrying value	$ 15,999		$ 15,999		$ 79,787
Cost or amortized cost	15,999		15,999		79,787
Fair value	15,999		15,999		79,794
Schedule of Trading Securities and Other Trading Assets [Line Items]
Carrying Value	305		305		0
Cost or amortized cost	307	0	307	0	0
Fair Value	305	0	305	0	0
Gross unrealized gains (losses) on investment securities held to maturity [Abstract]
Gross unrealized gains (losses)			0		7
Realized gains (losses) on investment securities [Abstract]
Net sale proceeds	3	89	9	594
Cost basis	0	(83)	0	(563)
Realized gains (losses)	3	6	9	31
Unrealized gains (losses) on investment securities [Abstract]
Cost basis	307	0	307	0	0
Current value	305	0	305	0	0
Unrealized gains (losses)	(2)	0	(2)	0
Equity Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Carrying Value	305		305		0
Cost or amortized cost	307		307		0
Fair Value	305		305		0
Unrealized gains (losses) on investment securities [Abstract]
Cost basis	307		307		0
Current value	305		305		0
US Treasury Bills [Member]
Held-to-maturity Securities [Line Items]
Carrying value	15,999		15,999		79,787
Cost or amortized cost	15,999		15,999		79,787
Fair value	$ 15,999		$ 15,999		$ 79,794