Available-for-Sale and Held-to-Maturity Securities (Schedule of Gross Unrealized Losses and the Estimated Fair Value by Length of Time) (Details) (USD $) In Thousands	Jun. 30, 2011
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	$ (3,025)
Available-for-sale Securities, Estimated fair value, Less than 12 months	181,789
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(606)
Available-for-sale Securities, Estimated fair value, 12 months or more	8,396
Available-for-sale Securities, Gross unrealized losses, Total	(3,631)
Available-for-sale Securities, Estimated fair value, Total	190,185
Corporate Fixed Income Securities [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(770)
Available-for-sale Securities, Estimated fair value, Less than 12 months	54,745
Available-for-sale Securities, Gross unrealized losses, 12 months or more	0
Available-for-sale Securities, Estimated fair value, 12 months or more	0
Available-for-sale Securities, Gross unrealized losses, Total	(770)
Available-for-sale Securities, Estimated fair value, Total	54,745
State and Municipal Securities [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(554)
Available-for-sale Securities, Estimated fair value, Less than 12 months	17,196
Available-for-sale Securities, Gross unrealized losses, 12 months or more	0
Available-for-sale Securities, Estimated fair value, 12 months or more	0
Available-for-sale Securities, Gross unrealized losses, Total	(554)
Available-for-sale Securities, Estimated fair value, Total	17,196
Agency [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(637)
Available-for-sale Securities, Estimated fair value, Less than 12 months	42,659
Available-for-sale Securities, Gross unrealized losses, 12 months or more	0
Available-for-sale Securities, Estimated fair value, 12 months or more	0
Available-for-sale Securities, Gross unrealized losses, Total	(637)
Available-for-sale Securities, Estimated fair value, Total	42,659
Commercial [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(668)
Available-for-sale Securities, Estimated fair value, Less than 12 months	48,933
Available-for-sale Securities, Gross unrealized losses, 12 months or more	0
Available-for-sale Securities, Estimated fair value, 12 months or more	0
Available-for-sale Securities, Gross unrealized losses, Total	(668)
Available-for-sale Securities, Estimated fair value, Total	48,933
Non-Agency [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(216)
Available-for-sale Securities, Estimated fair value, Less than 12 months	6,795
Available-for-sale Securities, Gross unrealized losses, 12 months or more	(606)
Available-for-sale Securities, Estimated fair value, 12 months or more	8,396
Available-for-sale Securities, Gross unrealized losses, Total	(822)
Available-for-sale Securities, Estimated fair value, Total	15,191
Asset-backed Securities [Member]
Available-for-sale Securities, Gross unrealized losses, Less than 12 months	(180)
Available-for-sale Securities, Estimated fair value, Less than 12 months	11,461
Available-for-sale Securities, Gross unrealized losses, 12 months or more	0
Available-for-sale Securities, Estimated fair value, 12 months or more	0
Available-for-sale Securities, Gross unrealized losses, Total	(180)
Available-for-sale Securities, Estimated fair value, Total	$ 11,461