Loans Receivable, Net - Credit Quality Indicators for Commercial Real Estate and Other Commercial Loans (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Credit Quality Indicators By Origination
Gross Charge-Offs	$ 3,897	$ 4,295
Total	17,218,518		$ 17,261,849
Commercial real estate
Credit Quality Indicators By Origination
Gross Charge-Offs, originated current fiscal year	0		0
Gross Charge-Offs, originated fiscal year before current fiscal year	0		0
Gross Charge-Offs, originated two years before current fiscal year	0		1,437
Gross Charge-Offs, originated three years before current fiscal year	0		1,128
Gross Charge-Offs, originated four years before current fiscal year	0		5
Gross Charge-Offs, Prior	0		326
Gross Charge-Offs, Revolving loans	0		0
Gross Charge-Offs	0	0	2,896
Term loans originated current fiscal year	312,691		1,321,385
Term loans originated fiscal year before current fiscal year	1,390,740		1,334,689
Term loans originated two years before current fiscal year	1,294,111		2,367,874
Term loans originated three years before current fiscal year	2,264,759		2,043,830
Term loans originated four years before current fiscal year	1,963,128		1,043,858
Term loans originated five years before current fiscal year	3,400,610		2,515,573
Revolving loans	326,770		336,504
Total	10,952,809		10,963,713
Commercial real estate | Pass
Credit Quality Indicators By Origination
Term loans originated current fiscal year	312,691		1,287,352
Term loans originated fiscal year before current fiscal year	1,358,077		1,311,808
Term loans originated two years before current fiscal year	1,273,541		2,307,217
Term loans originated three years before current fiscal year	2,207,649		1,988,629
Term loans originated four years before current fiscal year	1,907,142		1,036,774
Term loans originated five years before current fiscal year	3,331,689		2,446,084
Revolving loans	320,583		331,130
Total	10,711,372		10,708,994
Commercial real estate | Special Mention
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0		5,674
Term loans originated fiscal year before current fiscal year	1,926		18,151
Term loans originated two years before current fiscal year	15,474		26,662
Term loans originated three years before current fiscal year	22,980		30,965
Term loans originated four years before current fiscal year	31,275		0
Term loans originated five years before current fiscal year	24,719		25,922
Revolving loans	2,286		1,199
Total	98,660		108,573
Commercial real estate | Substandard
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0		28,359
Term loans originated fiscal year before current fiscal year	30,737		4,730
Term loans originated two years before current fiscal year	5,096		33,995
Term loans originated three years before current fiscal year	34,130		24,236
Term loans originated four years before current fiscal year	24,711		7,084
Term loans originated five years before current fiscal year	44,202		43,567
Revolving loans	3,901		4,175
Total	142,777		146,146
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	0		0
Revolving loans	0		0
Total	0		0
Other commercial
Credit Quality Indicators By Origination
Gross Charge-Offs, originated current fiscal year	1,203		4,260
Gross Charge-Offs, originated fiscal year before current fiscal year	12		83
Gross Charge-Offs, originated two years before current fiscal year	240		373
Gross Charge-Offs, originated three years before current fiscal year	22		525
Gross Charge-Offs, originated four years before current fiscal year	0		291
Gross Charge-Offs, Prior	59		246
Gross Charge-Offs, Revolving loans	0		0
Gross Charge-Offs	1,536	$ 1,932	5,778
Term loans originated current fiscal year	142,454		407,909
Term loans originated fiscal year before current fiscal year	319,137		315,890
Term loans originated two years before current fiscal year	293,845		496,999
Term loans originated three years before current fiscal year	512,739		462,173
Term loans originated four years before current fiscal year	448,469		203,771
Term loans originated five years before current fiscal year	671,600		495,291
Revolving loans	733,233		737,502
Total	3,121,477		3,119,535
Other commercial | Pass
Credit Quality Indicators By Origination
Term loans originated current fiscal year	140,432		402,180
Term loans originated fiscal year before current fiscal year	315,934		312,154
Term loans originated two years before current fiscal year	288,950		492,111
Term loans originated three years before current fiscal year	505,303		452,731
Term loans originated four years before current fiscal year	438,339		199,643
Term loans originated five years before current fiscal year	641,595		468,850
Revolving loans	697,652		706,991
Total	3,028,205		3,034,660
Other commercial | Special Mention
Credit Quality Indicators By Origination
Term loans originated current fiscal year	1,180		3,687
Term loans originated fiscal year before current fiscal year	2,164		533
Term loans originated two years before current fiscal year	1,977		463
Term loans originated three years before current fiscal year	3,136		743
Term loans originated four years before current fiscal year	2,097		44
Term loans originated five years before current fiscal year	419		0
Revolving loans	10,603		17,612
Total	21,576		23,082
Other commercial | Substandard
Credit Quality Indicators By Origination
Term loans originated current fiscal year	842		1,641
Term loans originated fiscal year before current fiscal year	865		3,203
Term loans originated two years before current fiscal year	2,523		4,423
Term loans originated three years before current fiscal year	4,298		8,680
Term loans originated four years before current fiscal year	8,030		4,083
Term loans originated five years before current fiscal year	29,558		26,441
Revolving loans	24,965		12,886
Total	71,081		61,357
Other commercial | Doubtful/ Loss
Credit Quality Indicators By Origination
Term loans originated current fiscal year	0		401
Term loans originated fiscal year before current fiscal year	174		0
Term loans originated two years before current fiscal year	395		2
Term loans originated three years before current fiscal year	2		19
Term loans originated four years before current fiscal year	3		1
Term loans originated five years before current fiscal year	28		0
Revolving loans	13		13
Total	$ 615		$ 436