Bank segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Noninterest expense
Income before income taxes	$ 64,163	$ 63,723	$ 135,236	$ 115,762
Income taxes	22,269	22,662	46,942	40,549
Net income	41,894	41,061	88,294	75,213
American Savings Bank (ASB)
Interest and dividend income
Interest and fees on loans	43,851	43,624	87,533	86,227
Interest and dividend on investment and mortgage-related securities	2,950	3,234	5,985	6,698
Total interest and dividend income	46,801	46,858	93,518	92,925
Interest expense
Interest on deposit liabilities	1,237	1,296	2,462	2,608
Interest on other borrowings	1,420	1,178	2,825	2,342
Total interest expense	2,657	2,474	5,287	4,950
Net interest income	44,144	44,384	88,231	87,975
Provision for loan losses	1,021	(959)	2,016	899
Net interest income after provision for loan losses	43,123	45,343	86,215	87,076
Noninterest income
Fees from other financial services	5,217	7,996	10,345	15,639
Fee income on deposit liabilities	4,645	4,433	9,066	8,747
Fee income on other financial products	2,064	1,780	4,354	3,574
Mortgage banking income	246	2,003	874	5,349
Gains on sale of securities	0	1,226	2,847	1,226
Other income	1,643	1,731	3,231	3,323
Total noninterest income	13,815	19,169	30,717	37,858
Noninterest expense
Compensation and employee benefits	19,872	20,063	40,158	40,151
Occupancy	4,489	4,219	8,442	8,342
Data processing	2,971	2,827	6,031	5,814
Services	2,855	2,328	5,128	4,431
Equipment	1,609	1,870	3,254	3,644
Other expense	8,094	8,500	15,247	16,095
Total noninterest expense	39,890	39,807	78,260	78,477
Income before income taxes	17,048	24,705	38,672	46,457
Income taxes	5,372	8,786	12,457	16,383
Net income	$ 11,676	$ 15,919	$ 26,215	$ 30,074