Securities (Amortized Cost And Estimated Fair Value Of Debt Securities) (Details) (USD $) In Thousands	Jun. 30, 2011
Securities
Held-to-Maturity Amortized Cost Basis, Due within one year	$ 5,851
Held-to-Maturity Amortized Cost Basis, Due after one year through five years	350
Held-to-Maturity Amortized Cost Basis, Mortgage-backed securities	462
Held-to-Maturity Amortized Cost Basis, Total	6,663
Held-to-Maturity Estimated Fair Value, Due within one year	5,911
Held-to-Maturity Estimated Fair Value, Due after one year through five years	366
Held-to-Maturity Estimated Fair Value, Mortgage-backed securities	479
Held-to-Maturity Estimated Fair Value, Total	6,756
Available-for-Sale Amortized Cost Basis, Due within one year	129,079
Available-for-Sale Amortized Cost Basis, Due after one year through five years	377,211
Available-for-Sale Amortized Cost Basis, Due after five years through ten years	323,650
Available-for-Sale Amortized Cost Basis, Due after ten years	33,188
Available-for-Sale Amortized Cost Basis, Mortgage-backed securities	710,781
Available-for-Sale Amortized Cost Basis, Total	1,573,909
Available-for-Sale Estimated Fair Value, Due within one year	131,636
Available-for-Sale Estimated Fair Value, Due after one year through five years	393,703
Available-for-Sale Estimated Fair Value, Due after five years through ten years	344,175
Available-for-Sale Estimated Fair Value, Due after ten years	33,983
Available-for-Sale Estimated Fair Value, Mortgage-backed securities	736,495
Available-for-Sale Estimated Fair Value, Total	$ 1,639,992