Bank subsidiary (Details 5) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Amortized Cost
Due after one year through five years	$ 190,140
Due after five years through ten years	85,682
Due after ten years	15,684
Total amortized cost	291,506
Mortgage-related securities-FNMA, FHLMC and GNMA - amortized cost	353,095
Total available-for-sale securities, amortized cost	644,601	607,918
Fair value
Due after one year through five years	192,438
Due after five years through ten years	90,597
Due after ten years	16,396
Total fair value	299,431
Mortgage-related securities-FNMA, FHLMC and GNMA - fair value	364,620
Total available for sale securities	$ 664,051	$ 624,331

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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