Loans Receivable, Net - Credit Quality Indicators for Commercial Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Credit Quality Indicators By Origination
Gross charge-offs	$ 3,293	$ 2,694
Total	15,518,612		$ 15,246,812
Commercial real estate
Credit Quality Indicators By Origination
Gross charge-offs, originated current fiscal year	0
Gross charge-offs, originated fiscal year before current fiscal year	300
Gross charge-offs, originated two years before current fiscal year	0
Gross charge-offs, originated three years before current fiscal year	0
Gross charge-offs, originated four years before current fiscal year	0
Gross charge-offs, prior	47
Gross charge-offs, revolving loans	0
Gross charge-offs	347	0
Term loans originated current fiscal year	461,073		2,584,831
Term loans originated fiscal year before current fiscal year	2,541,603		2,457,790
Term loans originated two years before current fiscal year	2,406,658		1,274,852
Term loans originated three years before current fiscal year	1,228,836		744,634
Term loans originated four years before current fiscal year	728,604		658,268
Term loans originated five years before current fiscal year	2,394,798		1,851,965
Revolving loans	230,447		224,707
Total	9,992,019		9,797,047
Commercial real estate | Pass
Credit Quality Indicators By Origination
Term loans originated current fiscal year	461,073		2,578,558
Term loans originated fiscal year before current fiscal year	2,534,386		2,454,696
Term loans originated two years before current fiscal year	2,403,479		1,269,254
Term loans originated three years before current fiscal year	1,224,116		709,246
Term loans originated four years before current fiscal year	693,522		634,316
Term loans originated five years before current fiscal year	2,316,087		1,787,941
Revolving loans	230,209		224,629
Total	9,862,872		9,658,640
Commercial real estate | Special Mention
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0		0
Term loans originated fiscal year before current fiscal year	0		0
Term loans originated two years before current fiscal year	0		0
Term loans originated three years before current fiscal year	0		0
Term loans originated four years before current fiscal year	0		0
Term loans originated five years before current fiscal year	1,412		1,416
Revolving loans	0		0
Total	1,412		1,416
Commercial real estate | Substandard
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0		6,273
Term loans originated fiscal year before current fiscal year	6,912		3,094
Term loans originated two years before current fiscal year	3,179		5,598
Term loans originated three years before current fiscal year	4,720		35,388
Term loans originated four years before current fiscal year	35,082		23,952
Term loans originated five years before current fiscal year	77,268		62,576
Revolving loans	237		78
Total	127,398		136,959
Commercial real estate | Doubtful/ Loss
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0		0
Term loans originated fiscal year before current fiscal year	305		0
Term loans originated two years before current fiscal year	0		0
Term loans originated three years before current fiscal year	0		0
Term loans originated four years before current fiscal year	0		0
Term loans originated five years before current fiscal year	31		32
Revolving loans	1		0
Total	337		32
Other commercial
Credit Quality Indicators By Origination
Gross charge-offs, originated current fiscal year	755
Gross charge-offs, originated fiscal year before current fiscal year	0
Gross charge-offs, originated two years before current fiscal year	0
Gross charge-offs, originated three years before current fiscal year	2
Gross charge-offs, originated four years before current fiscal year	0
Gross charge-offs, prior	15
Gross charge-offs, revolving loans	0
Gross charge-offs	772	$ 799
Term loans originated current fiscal year	60,778		603,393
Term loans originated fiscal year before current fiscal year	628,411		573,273
Term loans originated two years before current fiscal year	567,517		308,555
Term loans originated three years before current fiscal year	292,021		191,498
Term loans originated four years before current fiscal year	183,443		140,122
Term loans originated five years before current fiscal year	524,802		404,319
Revolving loans	547,132		578,508
Total	2,804,104		2,799,668
Other commercial | Pass
Credit Quality Indicators By Origination
Term loans originated current fiscal year	60,004		599,498
Term loans originated fiscal year before current fiscal year	626,914		569,542
Term loans originated two years before current fiscal year	564,433		304,179
Term loans originated three years before current fiscal year	288,377		185,748
Term loans originated four years before current fiscal year	178,084		135,727
Term loans originated five years before current fiscal year	516,219		398,523
Revolving loans	543,827		567,770
Total	2,777,858		2,760,987
Other commercial | Special Mention
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0		371
Term loans originated fiscal year before current fiscal year	17		0
Term loans originated two years before current fiscal year	0		0
Term loans originated three years before current fiscal year	0		0
Term loans originated four years before current fiscal year	0		0
Term loans originated five years before current fiscal year	108		114
Revolving loans	0		0
Total	125		485
Other commercial | Substandard
Credit Quality Indicators By Origination
Term loans originated current fiscal year	774		3,469
Term loans originated fiscal year before current fiscal year	1,479		2,707
Term loans originated two years before current fiscal year	2,123		4,373
Term loans originated three years before current fiscal year	3,641		5,748
Term loans originated four years before current fiscal year	5,357		4,394
Term loans originated five years before current fiscal year	8,434		5,322
Revolving loans	3,305		10,604
Total	25,113		36,617
Other commercial | Doubtful/ Loss
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0		55
Term loans originated fiscal year before current fiscal year	1		1,024
Term loans originated two years before current fiscal year	961		3
Term loans originated three years before current fiscal year	3		2
Term loans originated four years before current fiscal year	2		1
Term loans originated five years before current fiscal year	41		360
Revolving loans	0		134
Total	$ 1,008		$ 1,579