| 2007 |
Schedule of Held-to-maturity Securities [Line Items] | Held-to-maturity Securities, Debt Maturities [Abstract] | |
| Held-to-maturity Securities, Debt Maturities, Basis of Allocation | Mortgage-backed securities are disclosed separately in the table below as these investment securities may prepay prior to their scheduled contractual maturity dates. |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] | |
| Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount | 6,000 |
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount | 292,571,000 |
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount | 292,577,000 |
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract] | |
| Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value | 6,000 |
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value | 287,638,000 |
Held-to-maturity Securities, Debt Maturities, Fair Value | 287,644,000 |