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Segment financial information - Summary of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Interest expense
Interest expense, net	$ 27,256	$ 32,400	$ 61,468	$ 63,991
Interest income	7,579	3,134	20,202	6,267
Noninterest income
Noninterest income	$ 738,658	784,534	1,486,308	1,547,163
Noninterest expense
Loss from discontinued operations			$ 0	(24,853)
Discontinued Operations, Disposed of by Sale | American Savings Bank (ASB)
Interest and dividend income
Interest and fees on loans		72,960		145,931
Interest and dividends on investment securities		13,218		28,182
Total interest and dividend income		86,178		174,113
Interest expense
Interest on deposit liabilities		18,015		35,447
Interest on other borrowings		6,479		14,633
Interest expense, net		24,494		50,080
Interest income		61,684		124,033
Provision for credit losses		(1,910)		(4,069)
Net interest income after provision for credit losses		63,594		128,102
Noninterest income
Total noninterest income		15,765		32,974
Noninterest expense
Compensation and employee benefits		29,802		62,261
Occupancy		5,220		10,283
Data processing		4,960		9,806
Services		4,250		8,401
Equipment		2,477		5,126
Office supplies, printing and postage		1,006		2,024
Marketing		747		1,523
Goodwill impairment		82,190		82,190
Other expense		5,813		10,755
Total noninterest expense		136,465		192,369
Loss before income taxes from discontinued operations		(57,106)		(31,293)
Income tax benefit		(11,319)		(6,440)
Loss from discontinued operations		(45,787)		(24,853)
Discontinued Operations, Disposed of by Sale | American Savings Bank (ASB) | Fees from other financial services
Noninterest income
Noninterest income		5,133		10,007
Discontinued Operations, Disposed of by Sale | American Savings Bank (ASB) | Fee income on deposit liabilities
Noninterest income
Noninterest income		4,630		9,528
Discontinued Operations, Disposed of by Sale | American Savings Bank (ASB) | Fee income on other financial products
Noninterest income
Noninterest income		2,960		5,703
Discontinued Operations, Disposed of by Sale | American Savings Bank (ASB) | Bank-owned life insurance
Noninterest income
Noninterest income		2,255		5,839
Discontinued Operations, Disposed of by Sale | American Savings Bank (ASB) | Mortgage banking income
Noninterest income
Noninterest income		364		788
Discontinued Operations, Disposed of by Sale | American Savings Bank (ASB) | Other income, net
Noninterest income
Noninterest income		$ 423		$ 1,109

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