Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity SecuritiesHeld-to-maturity Securities, Unrecognized Holding GainsHeld-to-maturity Securities, Unrecognized Holding LossesHeld-to-maturity Securities, Fair Value
2007Debt and Securites Other than Mortgage-backed Securities [Member]US States and Political Subdivisions [Member]6,000006,000
Mortgage-backed Securities [Member]Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]292,571,000722,0005,655,000287,638,000
Major Types of Debt and Equity Securities [Domain]292,577,000722,0005,655,000287,644,000
2006Debt and Securites Other than Mortgage-backed Securities [Member]US States and Political Subdivisions [Member]30,0001,000031,000
Mortgage-backed Securities [Member]Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]371,314,000779,00011,405,000360,688,000
Major Types of Debt and Equity Securities [Domain]371,344,000780,00011,405,000360,719,000
2005Debt and Securites Other than Mortgage-backed Securities [Member]US States and Political Subdivisions [Member]70,0002,000072,000
Mortgage-backed Securities [Member]Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]454,170,0001,069,00012,322,000442,917,000
Major Types of Debt and Equity Securities [Domain]454,240,0001,071,00012,322,000442,989,000