Bank subsidiary (Details 2) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Assets
Available-for-sale investment and mortgage-related securities	$ 571,045,000	$ 678,152,000
Investment in stock of Federal Home Loan Bank of Seattle	97,764,000	97,764,000
Loans receivable held for investment, net	3,622,181,000	3,489,880,000
Loans held for sale, at lower of cost or fair value	25,016,000	7,849,000
Other	496,638,000	487,614,000
Goodwill	82,190,000	82,190,000
Total assets	9,264,363,000	9,085,344,000
Liabilities and shareholders' equity
Other	806,784,000	823,479,000
Total liabilities	7,692,312,000	7,567,414,000
Common stock	1,347,255,000	1,314,199,000
Retained earnings	197,165,000	181,910,000
Accumulated other comprehensive loss, net of tax benefits	(6,662,000)	(12,472,000)
Total shareholders' equity	1,537,758,000	1,483,637,000
Total liabilities and shareholders' equity	9,264,363,000	9,085,344,000
Other assets
Premises and equipment, net	3,248,658,000	3,165,918,000
Total other assets	496,638,000	487,614,000
Other liabilities
Total other liabilities	806,784,000	823,479,000
American Savings Bank (ASB)
Assets
Cash and cash equivalents	267,961,000	204,397,000
Federal funds sold		1,721,000
Available-for-sale investment and mortgage-related securities	571,045,000	678,152,000
Investment in stock of Federal Home Loan Bank of Seattle	97,764,000	97,764,000
Loans receivable held for investment, net	3,622,181,000	3,489,880,000
Loans held for sale, at lower of cost or fair value	25,016,000	7,849,000
Other	234,506,000	234,806,000
Goodwill	82,190,000	82,190,000
Total assets	4,900,663,000	4,796,759,000
Liabilities and shareholders' equity
Deposit liabilities-noninterest-bearing	951,978,000	865,642,000
Deposit liabilities-interest-bearing	3,110,823,000	3,109,730,000
Other borrowings	237,934,000	237,319,000
Other	99,067,000	90,683,000
Total liabilities	4,399,802,000	4,303,374,000
Common stock	331,678,000	330,562,000
Retained earnings	170,614,000	169,111,000
Accumulated other comprehensive loss, net of tax benefits	(1,431,000)	(6,288,000)
Total shareholders' equity	500,861,000	493,385,000
Total liabilities and shareholders' equity	4,900,663,000	4,796,759,000
Other assets
Bank-owned life insurance	120,482,000	117,565,000
Premises and equipment, net	56,736,000	56,495,000
Prepaid expenses	16,792,000	18,608,000
Accrued interest receivable	14,228,000	14,887,000
Mortgage-servicing rights	7,052,000	6,699,000
Real estate acquired in settlement of loans, net	6,080,000	4,292,000
Other	13,136,000	16,260,000
Total other assets	234,506,000	234,806,000
Other liabilities
Accrued expenses	13,469,000	16,426,000
Federal and state income taxes payable	38,496,000	28,372,000
Cashier's checks	23,741,000	22,396,000
Advance payments by borrowers	5,998,000	10,216,000
Other	17,363,000	13,273,000
Total other liabilities	99,067,000	90,683,000
Balance Sheet related disclosures
Securities sold under agreements to repurchase	173,000,000	172,000,000
Advances from Federal Home Loan Bank	65,000,000	65,000,000
Loan commitments and unused lines and letters of credit	1,400,000,000
Commitments to borrowers whose loan terms are modified under troubled debt restructuring	$ 3,000,000