Loans Receivable, Net - Credit Quality Indicators for Commercial Loans (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Credit Quality Indicators By Origination
Gross Charge-Offs	$ 4,295	$ 3,293
Total	16,732,502		$ 16,198,082
Commercial real estate
Credit Quality Indicators By Origination
Gross Charge-Offs, originated current fiscal year	0		889
Gross Charge-Offs, originated fiscal year before current fiscal year	0		430
Gross Charge-Offs, originated two years before current fiscal year	0		145
Gross Charge-Offs, originated three years before current fiscal year	0		0
Gross Charge-Offs, originated four years before current fiscal year	0		0
Gross Charge-Offs, Prior	0		616
Gross Charge-Offs, Revolving loans	0		0
Gross Charge-Offs	0	347	2,080
Term loans originated current fiscal year	375,228		1,316,100
Term loans originated fiscal year before current fiscal year	1,309,692		2,547,939
Term loans originated two years before current fiscal year	2,576,908		2,200,677
Term loans originated three years before current fiscal year	2,234,493		1,130,117
Term loans originated four years before current fiscal year	1,129,734		691,810
Term loans originated five years before current fiscal year	2,758,200		2,129,808
Revolving loans	288,014		286,855
Total	10,672,269		10,303,306
Commercial real estate | Pass
Credit Quality Indicators By Origination
Term loans originated current fiscal year	346,700		1,313,446
Term loans originated fiscal year before current fiscal year	1,306,800		2,520,484
Term loans originated two years before current fiscal year	2,545,228		2,178,153
Term loans originated three years before current fiscal year	2,201,926		1,124,525
Term loans originated four years before current fiscal year	1,118,991		656,203
Term loans originated five years before current fiscal year	2,681,056		2,053,011
Revolving loans	285,967		285,432
Total	10,486,668		10,131,254
Commercial real estate | Special Mention
Credit Quality Indicators By Origination
Term loans originated current fiscal year	525		97
Term loans originated fiscal year before current fiscal year	2,490		12,855
Term loans originated two years before current fiscal year	18,967		19,782
Term loans originated three years before current fiscal year	21,305		0
Term loans originated four years before current fiscal year	4,627		1,104
Term loans originated five years before current fiscal year	12,565		18,818
Revolving loans	198		1
Total	60,677		52,657
Commercial real estate | Substandard
Credit Quality Indicators By Origination
Term loans originated current fiscal year	28,003		2,557
Term loans originated fiscal year before current fiscal year	402		14,600
Term loans originated two years before current fiscal year	12,713		2,742
Term loans originated three years before current fiscal year	11,262		5,592
Term loans originated four years before current fiscal year	6,116		34,503
Term loans originated five years before current fiscal year	64,548		57,948
Revolving loans	847		1,421
Total	123,891		119,363
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	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	31		31
Revolving loans	1,002		1
Total	1,033		32
Other commercial
Credit Quality Indicators By Origination
Gross Charge-Offs, originated current fiscal year	1,448		3,080
Gross Charge-Offs, originated fiscal year before current fiscal year	0		406
Gross Charge-Offs, originated two years before current fiscal year	48		0
Gross Charge-Offs, originated three years before current fiscal year	311		92
Gross Charge-Offs, originated four years before current fiscal year	76		0
Gross Charge-Offs, Prior	49		313
Gross Charge-Offs, Revolving loans	0		0
Gross Charge-Offs	1,932	$ 772	3,891
Term loans originated current fiscal year	72,882		369,059
Term loans originated fiscal year before current fiscal year	376,046		566,295
Term loans originated two years before current fiscal year	564,827		531,558
Term loans originated three years before current fiscal year	522,039		245,962
Term loans originated four years before current fiscal year	236,089		145,828
Term loans originated five years before current fiscal year	581,118		448,619
Revolving loans	677,607		594,542
Total	3,030,608		2,901,863
Other commercial | Pass
Credit Quality Indicators By Origination
Term loans originated current fiscal year	72,804		367,337
Term loans originated fiscal year before current fiscal year	374,248		561,567
Term loans originated two years before current fiscal year	559,005		519,151
Term loans originated three years before current fiscal year	509,608		240,613
Term loans originated four years before current fiscal year	229,213		141,336
Term loans originated five years before current fiscal year	556,228		443,400
Revolving loans	661,798		577,953
Total	2,962,904		2,851,357
Other commercial | Special Mention
Credit Quality Indicators By Origination
Term loans originated current fiscal year	32		0
Term loans originated fiscal year before current fiscal year	217		3,319
Term loans originated two years before current fiscal year	1,364		10,187
Term loans originated three years before current fiscal year	10,216		0
Term loans originated four years before current fiscal year	1,926		0
Term loans originated five years before current fiscal year	0		0
Revolving loans	2,501		11,977
Total	16,256		25,483
Other commercial | Substandard
Credit Quality Indicators By Origination
Term loans originated current fiscal year	19		1,603
Term loans originated fiscal year before current fiscal year	1,581		1,408
Term loans originated two years before current fiscal year	4,457		2,218
Term loans originated three years before current fiscal year	2,213		5,347
Term loans originated four years before current fiscal year	4,948		4,490
Term loans originated five years before current fiscal year	24,881		5,219
Revolving loans	12,817		4,612
Total	50,916		24,897
Other commercial | Doubtful/ Loss
Credit Quality Indicators By Origination
Term loans originated current fiscal year	27		119
Term loans originated fiscal year before current fiscal year	0		1
Term loans originated two years before current fiscal year	1		2
Term loans originated three years before current fiscal year	2		2
Term loans originated four years before current fiscal year	2		2
Term loans originated five years before current fiscal year	9		0
Revolving loans	491		0
Total	$ 532		$ 126