Bank subsidiary (Details 3) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Available-for-sale securities
Amortized cost	$ 554,846	$ 672,288
Gross unrealized gains	16,206	9,748
Gross unrealized losses	(7)	(3,884)
Estimated fair value	571,045	678,152
Federal agency obligations
Available-for-sale securities
Amortized cost	195,614	317,945
Gross unrealized gains	2,235	171
Gross unrealized losses		(2,220)
Estimated fair value	197,849	315,896
Mortgage-related securities - FNMA, FHLMC and GNMA
Available-for-sale securities
Amortized cost	308,901	310,711
Gross unrealized gains	11,957	9,570
Gross unrealized losses	(6)	(311)
Estimated fair value	320,852	319,970
Municipal bonds
Available-for-sale securities
Amortized cost	50,331	43,632
Gross unrealized gains	2,014	7
Gross unrealized losses	(1)	(1,353)
Estimated fair value	$ 52,344	$ 42,286

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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+ Details