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Bank subsidiary (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Noninterest expense        
Income before income taxes $ 73,981 $ 76,769 $ 196,165 $ 163,122
Income taxes 25,804 27,894 69,926 57,700
Net income 48,177 48,875 126,239 105,422
American Savings Bank (ASB)
        
Interest income        
Interest and fees on loans 43,880 46,240 133,241 137,985
Interest on investment and mortgage-related securities 3,432 3,654 10,534 11,216
Total interest income 47,312 49,894 143,775 149,201
Interest expense        
Interest on deposit liabilities 1,540 2,166 5,015 7,146
Interest on other borrowings 1,201 1,375 3,676 4,124
Total interest expense 2,741 3,541 8,691 11,270
Net interest income 44,571 46,353 135,084 137,931
Provision for loan losses 3,580 3,822 9,504 10,927
Net interest income after provision for loan losses 40,991 42,531 125,580 127,004
Noninterest income        
Fees from other financial services 7,674 7,219 22,474 21,405
Fee income on deposit liabilities 4,527 4,492 13,127 13,540
Fee income on other financial products 1,660 1,806 4,741 5,340
Gain on sale of loans 4,077 1,092 8,297 2,268
Other income 1,346 1,597 4,155 5,977
Total noninterest income 19,284 16,206 52,794 48,530
Noninterest expense        
Compensation and employee benefits 18,684 17,646 56,026 53,317
Occupancy 4,400 4,313 12,866 12,841
Data processing 2,644 2,451 7,244 6,479
Services 3,062 1,686 7,066 5,406
Equipment 1,762 1,712 5,299 5,141
Other expense 8,096 7,763 22,909 23,651
Total noninterest expense 38,648 35,571 111,410 106,835
Income before income taxes 21,627 23,166 66,964 68,699
Income taxes 7,419 7,709 22,690 24,196
Net income $ 14,208 $ 15,457 $ 44,274 $ 44,503