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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) (USD $)
In Thousands
Sep. 30, 2011
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount$ 6,052
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value6,045
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis70,852
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value71,305
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount114
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value114
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis46,088
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value47,500
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount0
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value0
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis127,391
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value135,592
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount0
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value0
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis468,625
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value448,969
Held to Maturity Debt Securities, Before Securities Without Single Maturity6,166
Held to Maturity, Debt Securities Fair Value, Before Securities Without Single Maturity6,159
Available for Sale Securities, Debt Securities, Amortized Cost, Before Securities Without Debt Maturities712,956
Available for Sale Securities, Debt Maturities, Before Securities Without Single Maturities703,366
Held to Maturity Securities, Amortized Cost6,734
Held-to-maturity Securities, Debt Maturities, Fair Value6,774
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis2,593,494
Available for Sale, Estimated Fair Value2,649,457
Collateralized Mortgage Obligations [Member]
 
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount0
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value0
Collateralized Mortgage Obligations [Member]
 
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis1,078,396
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value1,107,255
Mortgage-Backed Securities [Member]
 
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount568
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value615
Mortgage-Backed Securities [Member]
 
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis802,142
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value$ 838,836