|
Mortgage Loan Portfolio as Collectively or Individually Evaluated for Impairment (Detail) (USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Financing Receivable, Recorded Investment [Line Items] | ||
| Mortgage loans collectively evaluated for impairment | $ 563,214 | $ 604,772 |
| Mortgage loans individually evaluated for impairment | ||
| Allowance for potential future losses | (2,442) | (2,849) |
| Carrying value | $ 560,772 | $ 601,923 |