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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2014
Derivative Instruments [Abstract]  
Summary of derivative instruments

 

 

 

 

 

 

 

 

 

 

2014

 

2013

 

2012

Notional amount

$
3,811 

 

$
7,535 

 

$
7,750 

Weighted average pay rate on interest-rate swaps

 
4.06% 

 

 
3.86% 

 

 
3.86% 

Weighted average receive rate on interest-rate swaps

 
0.18% 

 

 
0.19% 

 

 
0.24% 

Weighted average maturity (years)

 
4.3 

 

 
3.6 

 

 
4.6 

Fair value of interest-rate swaps

$
(318)

 

$
(599)

 

$
(990)

Fair value of yield maintenance provisions

$
318 

 

$
599 

 

$
990