Bank subsidiary (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
ASSETS
Available-for-sale investment and mortgage-related securities	$ 624,331	$ 678,152
Investment in stock of Federal Home Loan Bank of Seattle	97,764	97,764
Loans receivable held for investment, net	3,642,818	3,489,880
Loans held for sale, at lower of cost or fair value	9,601	7,849
Other	517,550	487,614
Goodwill	82,190	82,190
Total assets	9,592,731	9,085,344
LIABILITIES AND SHAREHOLDERS' EQUITY
Other	516,990	446,485
Total liabilities	8,026,489	7,567,414
Common stock	1,349,446	1,314,199
Retained earnings	201,640	181,910
Accumulated other comprehensive loss, net of tax benefits	(19,137)	(12,472)
Total shareholders' equity	1,531,949	1,483,637	1,441,648	1,389,454
Total liabilities and shareholders' equity	9,592,731	9,085,344
Other assets
Premises and equipment, net	3,334,501	3,165,918
Total other assets	517,550	487,614
Other liabilities
Total other liabilities	516,990	446,485
American Savings Bank (ASB)
ASSETS
Cash and cash equivalents	219,678	204,397
Federal funds sold		1,721
Available-for-sale investment and mortgage-related securities	624,331	678,152
Investment in stock of Federal Home Loan Bank of Seattle	97,764	97,764
Loans receivable held for investment, net	3,642,818	3,489,880
Loans held for sale, at lower of cost or fair value	9,601	7,849
Other	233,592	234,806
Goodwill	82,190	82,190
Total assets	4,909,974	4,796,759
LIABILITIES AND SHAREHOLDERS' EQUITY
Deposit liabilities-noninterest-bearing	993,828	865,642
Deposit liabilities-interest-bearing	3,076,204	3,109,730
Other borrowings	233,229	237,319
Other	118,078	90,683
Total liabilities	4,421,339	4,303,374
Common stock	331,880	330,562
Retained earnings	166,126	169,111
Accumulated other comprehensive loss, net of tax benefits	(9,371)	(6,288)
Total shareholders' equity	488,635	493,385
Total liabilities and shareholders' equity	4,909,974	4,796,759
Other assets
Bank-owned life insurance	121,470	117,565
Premises and equipment, net	52,940	56,495
Prepaid expenses	15,297	18,608
Accrued interest receivable	14,190	14,887
Mortgage-servicing rights	8,227	6,699
Real estate acquired in settlement of loans, net	7,260	4,292
Other	14,208	16,260
Total other assets	233,592	234,806
Other liabilities
Accrued expenses	21,216	16,426
Federal and state income taxes payable	35,002	28,372
Cashier's checks	22,802	22,396
Advance payments by borrowers	10,100	10,216
Other	28,958	13,273
Total other liabilities	$ 118,078	$ 90,683