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Bank subsidiary (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Noninterest expense    
Income before income taxes $ 60,087 $ 44,999
Income taxes 21,298 16,064
Net income 38,789 28,935
American Savings Bank (ASB)
    
Interest income    
Interest and fees on loans 44,888 46,097
Interest on investment and mortgage-related securities 3,805 3,769
Total interest income 48,693 49,866
Interest expense    
Interest on deposit liabilities 1,779 2,593
Interest on other borrowings 1,261 1,367
Total interest expense 3,040 3,960
Net interest income 45,653 45,906
Provision for loan losses 3,546 4,550
Net interest income after provision for loan losses 42,107 41,356
Noninterest income    
Fees from other financial services 7,337 6,946
Fee income on deposit liabilities 4,278 4,449
Fee income on other financial products 1,549 1,673
Other income 3,395 2,379
Total noninterest income 16,559 15,447
Noninterest expense    
Compensation and employee benefits 18,646 17,505
Occupancy 4,225 4,240
Data processing 2,111 1,970
Services 1,783 1,771
Equipment 1,730 1,657
Other expense 6,707 7,933
Total noninterest expense 35,202 35,076
Income before income taxes 23,464 21,727
Income taxes 7,587 7,876
Net income $ 15,877 $ 13,851