Loans Receivable and Allowance for Credit Losses - Loans Receivable by Credit Quality Risk Rating Indicator- Current Year (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 1,815,804	$ 1,506,562
2023	2,530,609	1,910,013
2022	3,858,999	1,615,910
2021	2,390,393	1,181,963
2020	1,979,397	963,225
Prior to 2020	4,380,357	2,868,925
Revolving Loans	1,610,946	716,838
Revolving loans to term loans	101,065	119,462
Total Loans	18,667,570	10,882,898
Total criticized and classified
Financing Receivable, Credit Quality Indicator [Line Items]
2024	10,894	11,882
2023	16,924	27,934
2022	87,250	32,648
2021	57,656	40,155
2020	68,367	12,753
Prior to 2020	195,629	81,269
Revolving Loans	57,953	39,570
Revolving loans to term loans	6,507	1,285
Total Loans	501,180	247,496
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	963	450
2023	9,409	27,934
2022	13,581	12,386
2021	14,931	30,920
2020	24,186	10,710
Prior to 2020	115,866	58,155
Revolving Loans	25,216	28,011
Revolving loans to term loans	4,761	687
Total Loans	208,913	169,253
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	9,931	4,421
2023	7,515	0
2022	73,669	20,262
2021	42,725	9,235
2020	44,181	2,043
Prior to 2020	79,763	23,114
Revolving Loans	32,737	11,559
Revolving loans to term loans	1,746	598
Total Loans	292,267	71,232
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	7,011
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior to 2020	0	0
Revolving Loans	0	0
Revolving loans to term loans	0	0
Total Loans	0	7,011
Loss
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior to 2020	0	0
Revolving Loans	0	0
Revolving loans to term loans	0	0
Total Loans	0	0
Pass/Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,804,910	1,494,680
2023	2,513,685	1,882,079
2022	3,771,749	1,583,262
2021	2,332,737	1,141,808
2020	1,911,030	950,472
Prior to 2020	4,184,728	2,787,656
Revolving Loans	1,552,993	677,268
Revolving loans to term loans	94,558	118,177
Total Loans	18,166,390	10,635,402
Mortgage Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,029,345	1,110,754
2023	2,049,829	1,550,892
2022	3,036,316	1,249,793
2021	1,925,522	1,035,213
2020	1,680,796	802,978
Prior to 2020	3,569,951	2,257,828
Revolving Loans	140,939	101,809
Revolving loans to term loans	12,453	33,846
Total Loans	13,445,151	8,143,113
Mortgage Portfolio Segment \| Total criticized and classified
Financing Receivable, Credit Quality Indicator [Line Items]
2024	3,709	3,735
2023	9,194	10,926
2022	22,135	3,048
2021	23,635	28,511
2020	35,620	10,558
Prior to 2020	147,105	46,961
Revolving Loans	4,461	4,934
Revolving loans to term loans	0	0
Total Loans	245,859	108,673
Mortgage Portfolio Segment \| Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	665	0
2023	6,797	10,926
2022	10,494	3,048
2021	9,127	28,511
2020	14,569	10,558
Prior to 2020	88,833	35,306
Revolving Loans	4,461	4,500
Revolving loans to term loans	0	0
Total Loans	134,946	92,849
Mortgage Portfolio Segment \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	3,044	3,735
2023	2,397	0
2022	11,641	0
2021	14,508	0
2020	21,051	0
Prior to 2020	58,272	11,655
Revolving Loans	0	434
Revolving loans to term loans	0	0
Total Loans	110,913	15,824
Mortgage Portfolio Segment \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior to 2020	0	0
Revolving Loans	0	0
Revolving loans to term loans	0	0
Total Loans	0	0
Mortgage Portfolio Segment \| Loss
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior to 2020	0	0
Revolving Loans	0	0
Revolving loans to term loans	0	0
Total Loans	0	0
Mortgage Portfolio Segment \| Pass/Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2024	1,025,636	1,107,019
2023	2,040,635	1,539,966
2022	3,014,181	1,246,745
2021	1,901,887	1,006,702
2020	1,645,176	792,420
Prior to 2020	3,422,846	2,210,867
Revolving Loans	136,478	96,875
Revolving loans to term loans	12,453	33,846
Total Loans	13,199,292	8,034,440
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
2024	754,484	366,725
2023	435,080	333,023
2022	763,011	348,016
2021	424,782	143,291
2020	289,044	145,863
Prior to 2020	726,248	525,471
Revolving Loans	1,141,225	506,031
Revolving loans to term loans	74,726	72,201
Total Loans	4,608,600	2,440,621
Commercial loans \| Total criticized and classified
Financing Receivable, Credit Quality Indicator [Line Items]
2024	7,185	8,147
2023	7,635	17,008
2022	65,112	29,600
2021	34,012	11,644
2020	32,623	2,186
Prior to 2020	48,094	34,065
Revolving Loans	51,817	34,069
Revolving loans to term loans	6,507	1,195
Total Loans	252,985	137,914
Commercial loans \| Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	298	450
2023	2,612	17,008
2022	3,084	9,338
2021	5,804	2,409
2020	9,493	152
Prior to 2020	26,924	22,752
Revolving Loans	20,030	23,333
Revolving loans to term loans	4,761	687
Total Loans	73,006	76,129
Commercial loans \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	6,887	686
2023	5,023	0
2022	62,028	20,262
2021	28,208	9,235
2020	23,130	2,034
Prior to 2020	21,170	11,313
Revolving Loans	31,787	10,736
Revolving loans to term loans	1,746	508
Total Loans	179,979	54,774
Commercial loans \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	7,011
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior to 2020	0	0
Revolving Loans	0	0
Revolving loans to term loans	0	0
Total Loans	0	7,011
Commercial loans \| Loss
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior to 2020	0	0
Revolving Loans	0	0
Revolving loans to term loans	0	0
Total Loans	0	0
Commercial loans \| Pass/Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2024	747,299	358,578
2023	427,445	316,015
2022	697,899	318,416
2021	390,770	131,647
2020	256,421	143,677
Prior to 2020	678,154	491,406
Revolving Loans	1,089,408	471,962
Revolving loans to term loans	68,219	71,006
Total Loans	4,355,615	2,302,707
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
2024	31,975	29,083
2023	45,700	26,098
2022	59,672	18,101
2021	40,089	3,459
2020	9,557	14,384
Prior to 2020	84,158	85,626
Revolving Loans	328,782	108,998
Revolving loans to term loans	13,886	13,415
Total Loans	613,819	299,164
Consumer loans \| Total criticized and classified
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	95	0
2022	3	0
2021	9	0
2020	124	9
Prior to 2020	430	243
Revolving Loans	1,675	567
Revolving loans to term loans	0	90
Total Loans	2,336	909
Consumer loans \| Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	3	0
2021	0	0
2020	124	0
Prior to 2020	109	97
Revolving Loans	725	178
Revolving loans to term loans	0	0
Total Loans	961	275
Consumer loans \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	95	0
2022	0	0
2021	9	0
2020	0	9
Prior to 2020	321	146
Revolving Loans	950	389
Revolving loans to term loans	0	90
Total Loans	1,375	634
Consumer loans \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior to 2020	0	0
Revolving Loans	0	0
Revolving loans to term loans	0	0
Total Loans	0	0
Consumer loans \| Loss
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior to 2020	0	0
Revolving Loans	0	0
Revolving loans to term loans	0	0
Total Loans	0	0
Consumer loans \| Pass/Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2024	31,975	29,083
2023	45,605	26,098
2022	59,669	18,101
2021	40,080	3,459
2020	9,433	14,375
Prior to 2020	83,728	85,383
Revolving Loans	327,107	108,431
Revolving loans to term loans	13,886	13,325
Total Loans	611,483	298,255
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2024	421,297	629,191
2023	909,374	894,075
2022	1,645,013	680,512
2021	1,006,785	498,768
2020	919,915	481,529
Prior to 2020	2,184,041	1,200,402
Revolving Loans	130,758	95,694
Revolving loans to term loans	10,895	32,240
Total Loans	7,228,078	4,512,411
Commercial \| Total criticized and classified
Financing Receivable, Credit Quality Indicator [Line Items]
2024	3,306	482
2023	4,450	10,926
2022	21,102	3,048
2021	9,127	28,511
2020	35,620	10,558
Prior to 2020	120,395	34,197
Revolving Loans	4,461	4,934
Revolving loans to term loans	0	0
Total Loans	198,461	92,656
Commercial \| Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	262	0
2023	4,377	10,926
2022	10,150	3,048
2021	9,127	28,511
2020	14,569	10,558
Prior to 2020	69,525	24,598
Revolving Loans	4,461	4,500
Revolving loans to term loans	0	0
Total Loans	112,471	82,141
Commercial \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	3,044	482
2023	73	0
2022	10,952	0
2021	0	0
2020	21,051	0
Prior to 2020	50,870	9,599
Revolving Loans	0	434
Revolving loans to term loans	0	0
Total Loans	85,990	10,515
Commercial \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior to 2020	0	0
Revolving Loans	0	0
Revolving loans to term loans	0	0
Total Loans	0	0
Commercial \| Loss
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior to 2020	0	0
Revolving Loans	0	0
Revolving loans to term loans	0	0
Total Loans	0	0
Commercial \| Pass/Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2024	417,991	628,709
2023	904,924	883,149
2022	1,623,911	677,464
2021	997,658	470,257
2020	884,295	470,971
Prior to 2020	2,063,646	1,166,205
Revolving Loans	126,297	90,760
Revolving loans to term loans	10,895	32,240
Total Loans	7,029,617	4,419,755
Commercial \| Mortgage Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans	7,228,078	4,512,411
Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
2024	363,254	344,095
2023	479,744	172,244
2022	701,811	184,136
2021	462,022	271,878
2020	460,161	230,456
Prior to 2020	904,202	601,970
Revolving Loans	10,181	6,115
Revolving loans to term loans	1,558	1,606
Total Loans	3,382,933	1,812,500
Multi-family \| Total criticized and classified
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	3,253
2023	1,560	0
2022	0	0
2021	1,043	0
2020	0	0
Prior to 2020	21,911	9,500
Revolving Loans	0	0
Revolving loans to term loans	0	0
Total Loans	24,514	12,753
Multi-family \| Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior to 2020	16,472	9,500
Revolving Loans		0
Revolving loans to term loans		0
Total Loans	16,472	9,500
Multi-family \| Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	3,253
2023	1,560	0
2022	0	0
2021	1,043	0
2020	0	0
Prior to 2020	5,439	0
Revolving Loans		0
Revolving loans to term loans		0
Total Loans	8,042	3,253
Multi-family \| Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior to 2020	0	0
Revolving Loans	0	0
Revolving loans to term loans	0	0
Total Loans	0	0
Multi-family \| Loss
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior to 2020	0	0
Revolving Loans	0	0
Revolving loans to term loans	0	0
Total Loans	0	0
Multi-family \| Pass/Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2024	363,254	340,842
2023	478,184	172,244
2022	701,811	184,136
2021	460,979	271,878
2020	460,161	230,456
Prior to 2020	882,291	592,470
Revolving Loans	10,181	6,115
Revolving loans to term loans	1,558	1,606
Total Loans	3,358,419	1,799,747
Multi-family \| Mortgage Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans	3,382,933	1,812,500
Construction
Financing Receivable, Credit Quality Indicator [Line Items]
2024	104,009	41,209
2023	310,098	342,890
2022	260,190	185,034
2021	122,446	68,603
2020	24,017	1,339
Prior to 2020	2,743	14,171
Revolving Loans	0	0
Revolving loans to term loans	0	0
Total Loans	823,503	653,246
Construction \| Total criticized and classified
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	1,064	0
2022	0	0
2021	12,346	0
2020	0	0
Prior to 2020	0	771
Revolving Loans	0	0
Revolving loans to term loans	0	0
Total Loans	13,410	771
Construction \| Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	1,064	0
2022	0	0
2021	0	0
2020	0	0
Prior to 2020	0	0
Revolving Loans		0
Revolving loans to term loans		0
Total Loans	1,064	0

Loans Receivable and Allowance for Credit Losses - Loans Receivable by Credit Quality Risk Rating Indicator- Current Year (Details) - USD ($)
$ in Thousands