| Schedule of Held-to-maturity Securities [Line Items] |
Held-to-maturity Securities | Held-to-maturity Securities, Unrecognized Holding Gains | Held-to-maturity Securities, Unrecognized Holding Losses | Held-to-maturity Securities, Fair Value |
2007 | | Debt and Securites Other than Mortgage-backed Securities [Member] | US States and Political Subdivisions [Member] | 6,000 | 0 | 0 | 6,000 |
Mortgage-backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | 292,571,000 | 722,000 | 5,655,000 | 287,638,000 |
Major Types of Debt and Equity Securities [Domain] | 292,577,000 | 722,000 | 5,655,000 | 287,644,000 |
2006 | | Debt and Securites Other than Mortgage-backed Securities [Member] | US States and Political Subdivisions [Member] | 30,000 | 1,000 | 0 | 31,000 |
Mortgage-backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | 371,314,000 | 779,000 | 11,405,000 | 360,688,000 |
Major Types of Debt and Equity Securities [Domain] | 371,344,000 | 780,000 | 11,405,000 | 360,719,000 |
2005 | | Debt and Securites Other than Mortgage-backed Securities [Member] | US States and Political Subdivisions [Member] | 70,000 | 2,000 | 0 | 72,000 |
Mortgage-backed Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | 454,170,000 | 1,069,000 | 12,322,000 | 442,917,000 |
Major Types of Debt and Equity Securities [Domain] | 454,240,000 | 1,071,000 | 12,322,000 | 442,989,000 |