Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2013

Derivative Instruments [Abstract]

Summary of derivative instruments

	March 31,2013		December 31,2012
Notional amount	$	7,696	$	7,750
Weighted average pay rate on interest-rate swaps		3.86%		3.86%
Weighted average receive rate on interest-rate swaps		0.23%		0.24%
Weighted average maturity (years)		4.3		4.6
Fair value of interest-rate swaps	$	(907)	$	(990)
Fair value of yield maintenance provisions		907		990