Loans Receivable, Net - Credit Quality Indicators for Commercial Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Credit Quality Indicators By Origination
Gross charge-offs	$ 3,201	$ 3,865	$ 10,284	$ 10,905
Total	16,135,046		16,135,046		$ 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			305
Gross charge-offs, originated two years before current fiscal year			48
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			266
Gross charge-offs, revolving loans			0
Gross charge-offs	203	0	619	1,642
Term loans originated current fiscal year	1,041,638		1,041,638		2,584,831
Term loans originated fiscal year before current fiscal year	2,598,013		2,598,013		2,457,790
Term loans originated two years before current fiscal year	2,288,199		2,288,199		1,274,852
Term loans originated three years before current fiscal year	1,164,141		1,164,141		744,634
Term loans originated four years before current fiscal year	707,223		707,223		658,268
Term loans originated five years before current fiscal year	2,232,026		2,232,026		1,851,965
Revolving loans	261,206		261,206		224,707
Total	10,292,446		10,292,446		9,797,047
Commercial real estate | Pass
Credit Quality Indicators By Origination
Term loans originated current fiscal year	1,039,366		1,039,366		2,578,558
Term loans originated fiscal year before current fiscal year	2,589,388		2,589,388		2,454,696
Term loans originated two years before current fiscal year	2,282,469		2,282,469		1,269,254
Term loans originated three years before current fiscal year	1,158,471		1,158,471		709,246
Term loans originated four years before current fiscal year	673,300		673,300		634,316
Term loans originated five years before current fiscal year	2,157,871		2,157,871		1,787,941
Revolving loans	260,843		260,843		224,629
Total	10,161,708		10,161,708		9,658,640
Commercial real estate | Special Mention
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0		0		0
Term loans originated fiscal year before current fiscal year	0		0		0
Term loans originated two years before current fiscal year	3,316		3,316		0
Term loans originated three years before current fiscal year	0		0		0
Term loans originated four years before current fiscal year	0		0		0
Term loans originated five years before current fiscal year	1,044		1,044		1,416
Revolving loans	1		1		0
Total	4,361		4,361		1,416
Commercial real estate | Substandard
Credit Quality Indicators By Origination
Term loans originated current fiscal year	2,272		2,272		6,273
Term loans originated fiscal year before current fiscal year	8,625		8,625		3,094
Term loans originated two years before current fiscal year	2,414		2,414		5,598
Term loans originated three years before current fiscal year	5,670		5,670		35,388
Term loans originated four years before current fiscal year	33,923		33,923		23,952
Term loans originated five years before current fiscal year	73,080		73,080		62,576
Revolving loans	361		361		78
Total	126,345		126,345		136,959
Commercial real estate | Doubtful/ Loss
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0		0		0
Term loans originated fiscal year before current fiscal year	0		0		0
Term loans originated two years before current fiscal year	0		0		0
Term loans originated three years before current fiscal year	0		0		0
Term loans originated four years before current fiscal year	0		0		0
Term loans originated five years before current fiscal year	31		31		32
Revolving loans	1		1		0
Total	32		32		32
Other commercial
Credit Quality Indicators By Origination
Gross charge-offs, originated current fiscal year			2,195
Gross charge-offs, originated fiscal year before current fiscal year			386
Gross charge-offs, originated two years before current fiscal year			0
Gross charge-offs, originated three years before current fiscal year			40
Gross charge-offs, originated four years before current fiscal year			0
Gross charge-offs, prior			274
Gross charge-offs, revolving loans			0
Gross charge-offs	654	$ 1,502	2,895	$ 3,105
Term loans originated current fiscal year	278,178		278,178		603,393
Term loans originated fiscal year before current fiscal year	601,009		601,009		573,273
Term loans originated two years before current fiscal year	548,031		548,031		308,555
Term loans originated three years before current fiscal year	258,604		258,604		191,498
Term loans originated four years before current fiscal year	163,795		163,795		140,122
Term loans originated five years before current fiscal year	478,591		478,591		404,319
Revolving loans	588,577		588,577		578,508
Total	2,916,785		2,916,785		2,799,668
Other commercial | Pass
Credit Quality Indicators By Origination
Term loans originated current fiscal year	276,785		276,785		599,498
Term loans originated fiscal year before current fiscal year	596,414		596,414		569,542
Term loans originated two years before current fiscal year	545,505		545,505		304,179
Term loans originated three years before current fiscal year	253,866		253,866		185,748
Term loans originated four years before current fiscal year	158,454		158,454		135,727
Term loans originated five years before current fiscal year	471,124		471,124		398,523
Revolving loans	575,621		575,621		567,770
Total	2,877,769		2,877,769		2,760,987
Other commercial | Special Mention
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0		0		371
Term loans originated fiscal year before current fiscal year	3,626		3,626		0
Term loans originated two years before current fiscal year	193		193		0
Term loans originated three years before current fiscal year	0		0		0
Term loans originated four years before current fiscal year	0		0		0
Term loans originated five years before current fiscal year	98		98		114
Revolving loans	7,547		7,547		0
Total	11,464		11,464		485
Other commercial | Substandard
Credit Quality Indicators By Origination
Term loans originated current fiscal year	1,159		1,159		3,469
Term loans originated fiscal year before current fiscal year	968		968		2,707
Term loans originated two years before current fiscal year	2,331		2,331		4,373
Term loans originated three years before current fiscal year	4,736		4,736		5,748
Term loans originated four years before current fiscal year	5,339		5,339		4,394
Term loans originated five years before current fiscal year	7,369		7,369		5,322
Revolving loans	5,409		5,409		10,604
Total	27,311		27,311		36,617
Other commercial | Doubtful/ Loss
Credit Quality Indicators By Origination
Term loans originated current fiscal year	234		234		55
Term loans originated fiscal year before current fiscal year	1		1		1,024
Term loans originated two years before current fiscal year	2		2		3
Term loans originated three years before current fiscal year	2		2		2
Term loans originated four years before current fiscal year	2		2		1
Term loans originated five years before current fiscal year	0		0		360
Revolving loans	0		0		134
Total	$ 241		$ 241		$ 1,579