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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
Jun. 30, 2013
Statement of Investments [Line Items]  
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount $ 0
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value 0
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis 44,411
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value 44,491
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 66,739
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value 70,642
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 190,392
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value 194,234
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 272,276
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value 249,505
Held to Maturity Debt Securities, Before Securities Without Single Maturity 0
Held to Maturity, Debt Securities Fair Value, Before Securities Without Single Maturity 0
Available for Sale Securities, Debt Securities, Amortized Cost, Before Securities Without Debt Maturities 573,818
Available for Sale Securities, Debt Maturities, Before Securities Without Single Maturities 558,872
Held to Maturity Securities, Amortized Cost 227
Held-to-maturity Securities, Debt Maturities, Fair Value 246
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis 2,797,575
Available for Sale, Estimated Fair Value 2,772,533
Collateralized Mortgage Backed Securities [Member]
 
Statement of Investments [Line Items]  
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount 227
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value 246
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
Collateralized Mortgage Backed Securities [Member]
 
Statement of Investments [Line Items]  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 970,273
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 973,099
Collateralized Mortgage Obligations [Member]
 
Statement of Investments [Line Items]  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 1,253,484
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 1,240,562