Bank subsidiary (Details 5) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Amortized Cost
Due after one year through five years	$ 189,439
Due after five years through ten years	66,828
Due after ten years	10,935
Total amortized cost	267,202
Mortgage-related securities-FNMA, FHLMC and GNMA - amortized cost	347,824
Total available-for-sale securities, amortized cost	615,026	607,918
Fair value
Due after one year through five years	191,371
Due after five years through ten years	69,705
Due after ten years	11,401
Total fair value	272,477
Mortgage-related securities-FNMA, FHLMC and GNMA - fair value	358,586
Total available for sale securities	$ 631,063	$ 624,331

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