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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
Mar. 31, 2012
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 55,804
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value 56,063
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount 6,001
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value 5,980
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis 42,008
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value 43,985
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 151,445
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value 162,134
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 425,652
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value 404,287
Held to Maturity Debt Securities, Before Securities Without Single Maturity 6,180
Held to Maturity, Debt Securities Fair Value, Before Securities Without Single Maturity 6,159
Available for Sale Securities, Debt Securities, Amortized Cost, Before Securities Without Debt Maturities 674,909
Available for Sale Securities, Debt Maturities, Before Securities Without Single Maturities 666,469
Held to Maturity Securities, Amortized Cost 6,608
Held-to-maturity Securities, Debt Maturities, Fair Value 6,626
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis 2,926,381
Available for Sale, Estimated Fair Value 2,969,680
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
Mortgage-Backed Securities [Member]
 
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount 428
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value 467
Collateralized Mortgage Obligations [Member]
 
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 1,077,326
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value 1,096,585
Mortgage-Backed Securities [Member]
 
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis 1,174,146
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 1,206,626