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Investment Securities (Details 4) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Fair Value  
Due in 1 year or less $ 34,264
Due after 1 year through 5 years 178,894
Due after 5 years through 10 years 154,050
Due after 10 years 66,543
Mortgage-backed, asset-backed, and collateralized securities 202,964
Fair Value 636,715
Amortized Cost  
Due in 1 year or less 34,193
Due after 1 year through 5 years 172,278
Due after 5 years through 10 years 149,222
Due after 10 years 62,344
Mortgage-backed, asset-backed, and collateralized securities 192,185
Total $ 610,222