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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Statement of Investments [Line Items]  
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount $ 114
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value 114
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis 36,622
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value 36,707
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount 0
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value 0
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis 60,067
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value 63,879
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount 0
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value 0
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis 162,239
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value 174,060
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount 0
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value 0
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis 335,344
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value 302,340
Held to Maturity Debt Securities, Before Securities Without Single Maturity 114
Held to Maturity, Debt Securities Fair Value, Before Securities Without Single Maturity 114
Available for Sale Securities, Debt Securities, Amortized Cost, Before Securities Without Debt Maturities 594,272
Available for Sale Securities, Debt Maturities, Before Securities Without Single Maturities 576,986
Held to Maturity Securities, Amortized Cost 454
Held-to-maturity Securities, Debt Maturities, Fair Value 487
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis 2,630,991
Available for Sale, Estimated Fair Value 2,672,366
Collateralized Mortgage Obligations [Member]
 
Statement of Investments [Line Items]  
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount 0
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value 0
Mortgage-Backed Securities [Member]
 
Statement of Investments [Line Items]  
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount 340
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value 373
Collateralized Mortgage Obligations [Member]
 
Statement of Investments [Line Items]  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 1,014,837
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 1,030,190
Mortgage-Backed Securities [Member]
 
Statement of Investments [Line Items]  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 1,021,882
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 1,065,190