Bank subsidiary (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Noninterest expense
Income before income taxes	$ 41,354	$ 45,748	$ 86,353	$ 88,626
Income taxes	13,742	16,013	29,806	31,292
Net income	27,612	29,735	56,547	57,334
American Savings Bank (ASB)
Interest and dividend income
Interest and fees on loans	45,648	49,328	91,745	99,073
Interest and dividends on investment and mortgage-related securities	3,793	3,646	7,562	6,963
Total interest and dividend income	49,441	52,974	99,307	106,036
Interest expense
Interest on deposit liabilities	2,387	3,852	4,980	8,275
Interest on other borrowings	1,382	1,418	2,749	2,844
Total interest expense	3,769	5,270	7,729	11,119
Net interest income	45,672	47,704	91,578	94,917
Provision for loan losses	2,555	990	7,105	6,349
Net interest income after provision for loan losses	43,117	46,714	84,473	88,568
Noninterest income
Fee income on deposit liabilities	4,599	7,891	9,048	15,411
Fees from other financial services	7,240	6,649	14,186	13,063
Fee income on other financial products	1,861	1,735	3,534	3,260
Other income	3,177	2,383	5,556	4,776
Total noninterest income	16,877	18,658	32,324	36,510
Noninterest expense
Compensation and employee benefits	18,166	18,907	35,671	36,309
Occupancy	4,288	4,216	8,528	8,441
Data processing	2,058	4,564	4,028	8,902
Services	1,949	1,845	3,720	3,573
Equipment	1,772	1,640	3,429	3,349
Other expense	7,955	8,453	15,888	17,021
Total noninterest expense	36,188	39,625	71,264	77,595
Income before income taxes	23,806	25,747	45,533	47,483
Income taxes	8,611	9,616	16,487	17,616
Net income	$ 15,195	$ 16,131	$ 29,046	$ 29,867