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Fair Value Measurements (Securities in Unrealized Loss Positions) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	$ (5,301)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	653,696
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(129)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	41,945
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(5,430)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	695,641
US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(2,648)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	257,353
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(2,648)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	257,353
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(2,653)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	396,343
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	(129)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	41,945
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(2,782)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	$ 438,288

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