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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
Dec. 31, 2011
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount $ 179
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value 179
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis 67,451
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value 67,802
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount 5,987
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value 5,973
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis 30,828
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value 32,103
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 144,777
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value 154,185
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 441,158
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value 420,852
Held to Maturity Debt Securities, Before Securities Without Single Maturity 6,166
Held to Maturity, Debt Securities Fair Value, Before Securities Without Single Maturity 6,152
Available for Sale Securities, Debt Securities, Amortized Cost, Before Securities Without Debt Maturities 684,214
Available for Sale Securities, Debt Maturities, Before Securities Without Single Maturities 674,942
Held to Maturity Securities, Amortized Cost 6,669
Held-to-maturity Securities, Debt Maturities, Fair Value 6,699
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis 2,515,740
Available for Sale, Estimated Fair Value 2,556,248
Collateralized Mortgage Obligations [Member]
 
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
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 982,851
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 1,001,209
Mortgage-Backed Securities [Member]
 
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount 503
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value 547
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 848,675
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 880,097