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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, 2012
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount $ 0
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value 0
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis 40,009
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value 40,066
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 60,710
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value 65,006
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 176,212
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value 187,333
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 313,800
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value 288,017
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 590,731
Available for Sale Securities, Debt Maturities, Before Securities Without Single Maturities 580,422
Held to Maturity Securities, Amortized Cost 292
Held-to-maturity Securities, Debt Maturities, Fair Value 319
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis 2,633,755
Available for Sale, Estimated Fair Value 2,671,162
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 1,195,234
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 1,211,119
Mortgage Backed Securities [Member]
 
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount 292
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value 319
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 847,790
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 879,621