Loans Receivable and Allowance for Credit Losses (Summary of Loans Receivable by Credit Quality Risk Rating Indicator-Prior Year) (Detail) - USD ($)
$ in Thousands |
Mar. 31, 2025 |
Dec. 31, 2024 |
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
$ 545,036
|
$ 1,815,804
|
| 2023 |
1,659,366
|
2,530,609
|
| 2022 |
2,563,603
|
3,858,999
|
| 2021 |
3,814,202
|
2,390,393
|
| 2020 |
2,317,415
|
1,979,397
|
| Prior to 2020 |
6,265,886
|
4,380,357
|
| Revolving Loans |
1,537,173
|
1,610,946
|
| Revolving loans to term loans |
98,275
|
101,065
|
| Total gross loans |
18,800,956
|
18,667,570
|
| Total classified and criticized |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
3,163
|
10,894
|
| 2023 |
7,992
|
16,924
|
| 2022 |
31,198
|
87,250
|
| 2021 |
119,845
|
57,656
|
| 2020 |
116,049
|
68,367
|
| Prior to 2020 |
267,027
|
195,629
|
| Revolving Loans |
49,968
|
57,953
|
| Revolving loans to term loans |
6,475
|
6,507
|
| Total gross loans |
601,717
|
501,180
|
| Special Mention |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
179
|
963
|
| 2023 |
2,851
|
9,409
|
| 2022 |
14,056
|
13,581
|
| 2021 |
39,355
|
14,931
|
| 2020 |
68,372
|
24,186
|
| Prior to 2020 |
119,612
|
115,866
|
| Revolving Loans |
21,052
|
25,216
|
| Revolving loans to term loans |
3,531
|
4,761
|
| Total gross loans |
269,008
|
208,913
|
| Substandard |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
2,984
|
9,931
|
| 2023 |
5,141
|
7,515
|
| 2022 |
17,142
|
73,669
|
| 2021 |
80,490
|
42,725
|
| 2020 |
47,677
|
44,181
|
| Prior to 2020 |
147,415
|
79,763
|
| Revolving Loans |
28,916
|
32,737
|
| Revolving loans to term loans |
2,944
|
1,746
|
| Total gross loans |
332,709
|
292,267
|
| 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 gross loans |
0
|
0
|
| 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 gross loans |
0
|
0
|
| Pass/Watch |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
541,873
|
1,804,910
|
| 2023 |
1,651,374
|
2,513,685
|
| 2022 |
2,532,405
|
3,771,749
|
| 2021 |
3,694,357
|
2,332,737
|
| 2020 |
2,201,366
|
1,911,030
|
| Prior to 2020 |
5,998,859
|
4,184,728
|
| Revolving Loans |
1,487,205
|
1,552,993
|
| Revolving loans to term loans |
91,800
|
94,558
|
| Total gross loans |
18,199,239
|
18,166,390
|
| Commercial |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
205,510
|
421,297
|
| 2023 |
349,529
|
909,374
|
| 2022 |
922,247
|
1,645,013
|
| 2021 |
1,625,492
|
1,006,785
|
| 2020 |
1,005,140
|
919,915
|
| Prior to 2020 |
3,046,232
|
2,184,041
|
| Revolving Loans |
130,787
|
130,758
|
| Revolving loans to term loans |
10,714
|
10,895
|
| Total gross loans |
7,295,651
|
7,228,078
|
| Commercial | Total classified and criticized |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
2,984
|
3,306
|
| 2023 |
0
|
4,450
|
| 2022 |
3,252
|
21,102
|
| 2021 |
28,542
|
9,127
|
| 2020 |
56,745
|
35,620
|
| Prior to 2020 |
140,932
|
120,395
|
| Revolving Loans |
4,436
|
4,461
|
| Revolving loans to term loans |
0
|
0
|
| Total gross loans |
236,891
|
198,461
|
| Commercial | Special Mention |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
0
|
262
|
| 2023 |
0
|
4,377
|
| 2022 |
3,185
|
10,150
|
| 2021 |
20,698
|
9,127
|
| 2020 |
48,125
|
14,569
|
| Prior to 2020 |
56,524
|
69,525
|
| Revolving Loans |
4,436
|
4,461
|
| Revolving loans to term loans |
0
|
0
|
| Total gross loans |
132,968
|
112,471
|
| Commercial | Substandard |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
2,984
|
3,044
|
| 2023 |
0
|
73
|
| 2022 |
67
|
10,952
|
| 2021 |
7,844
|
0
|
| 2020 |
8,620
|
21,051
|
| Prior to 2020 |
84,408
|
50,870
|
| Revolving Loans |
0
|
0
|
| Revolving loans to term loans |
0
|
0
|
| Total gross loans |
103,923
|
85,990
|
| 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 gross 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 gross loans |
0
|
0
|
| Commercial | Pass/Watch |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
202,526
|
417,991
|
| 2023 |
349,529
|
904,924
|
| 2022 |
918,995
|
1,623,911
|
| 2021 |
1,596,950
|
997,658
|
| 2020 |
948,395
|
884,295
|
| Prior to 2020 |
2,905,300
|
2,063,646
|
| Revolving Loans |
126,351
|
126,297
|
| Revolving loans to term loans |
10,714
|
10,895
|
| Total gross loans |
7,058,760
|
7,029,617
|
| Construction |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
10,446
|
104,009
|
| 2023 |
136,029
|
310,098
|
| 2022 |
309,820
|
260,190
|
| 2021 |
200,026
|
122,446
|
| 2020 |
98,333
|
24,017
|
| Prior to 2020 |
1,702
|
2,743
|
| Revolving Loans |
0
|
0
|
| Revolving loans to term loans |
0
|
0
|
| Total gross loans |
756,356
|
823,503
|
| Construction | Total classified and criticized |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
0
|
0
|
| 2023 |
0
|
1,064
|
| 2022 |
13,312
|
0
|
| 2021 |
6,639
|
12,346
|
| 2020 |
6,772
|
0
|
| Prior to 2020 |
0
|
0
|
| Revolving Loans |
0
|
0
|
| Revolving loans to term loans |
0
|
0
|
| Total gross loans |
26,723
|
13,410
|
| Construction | Special Mention |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
0
|
0
|
| 2023 |
0
|
1,064
|
| 2022 |
1,154
|
0
|
| 2021 |
6,639
|
0
|
| 2020 |
0
|
0
|
| Prior to 2020 |
0
|
0
|
| Revolving Loans |
0
|
0
|
| Revolving loans to term loans |
0
|
0
|
| Total gross loans |
7,793
|
1,064
|
| Construction | Substandard |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
0
|
0
|
| 2023 |
0
|
0
|
| 2022 |
12,158
|
0
|
| 2021 |
0
|
12,346
|
| 2020 |
6,772
|
0
|
| Prior to 2020 |
0
|
0
|
| Revolving Loans |
0
|
0
|
| Revolving loans to term loans |
0
|
0
|
| Total gross loans |
18,930
|
12,346
|
| Construction | 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 gross loans |
0
|
0
|
| Construction | 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 gross loans |
0
|
0
|
| Construction | Pass/Watch |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
10,446
|
104,009
|
| 2023 |
136,029
|
309,034
|
| 2022 |
296,508
|
260,190
|
| 2021 |
193,387
|
110,100
|
| 2020 |
91,561
|
24,017
|
| Prior to 2020 |
1,702
|
2,743
|
| Revolving Loans |
0
|
0
|
| Revolving loans to term loans |
0
|
0
|
| Total gross loans |
729,633
|
810,093
|
| Residential |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
23,199
|
140,785
|
| 2023 |
132,733
|
350,613
|
| 2022 |
345,102
|
429,302
|
| 2021 |
422,590
|
334,269
|
| 2020 |
329,853
|
276,703
|
| Prior to 2020 |
740,927
|
478,965
|
| Revolving Loans |
0
|
0
|
| Revolving loans to term loans |
0
|
0
|
| Total gross loans |
1,994,404
|
2,010,637
|
| Residential | Total classified and criticized |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
0
|
403
|
| 2023 |
553
|
2,120
|
| 2022 |
2,430
|
1,033
|
| 2021 |
1,408
|
1,119
|
| 2020 |
1,115
|
0
|
| Prior to 2020 |
4,749
|
4,799
|
| Revolving Loans |
0
|
0
|
| Revolving loans to term loans |
0
|
0
|
| Total gross loans |
10,255
|
9,474
|
| Residential | Special Mention |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
0
|
403
|
| 2023 |
553
|
1,356
|
| 2022 |
1,196
|
344
|
| 2021 |
722
|
0
|
| 2020 |
0
|
0
|
| Prior to 2020 |
2,690
|
2,836
|
| Revolving Loans |
0
|
0
|
| Revolving loans to term loans |
0
|
0
|
| Total gross loans |
5,161
|
4,939
|
| Residential | Substandard |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
0
|
0
|
| 2023 |
0
|
764
|
| 2022 |
1,234
|
689
|
| 2021 |
686
|
1,119
|
| 2020 |
1,115
|
0
|
| Prior to 2020 |
2,059
|
1,963
|
| Revolving Loans |
0
|
0
|
| Revolving loans to term loans |
0
|
0
|
| Total gross loans |
5,094
|
4,535
|
| Residential | 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 gross loans |
0
|
0
|
| Residential | 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 gross loans |
0
|
0
|
| Residential | Pass/Watch |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
23,199
|
140,382
|
| 2023 |
132,180
|
348,493
|
| 2022 |
342,672
|
428,269
|
| 2021 |
421,182
|
333,150
|
| 2020 |
328,738
|
276,703
|
| Prior to 2020 |
736,178
|
474,166
|
| Revolving Loans |
0
|
0
|
| Revolving loans to term loans |
0
|
0
|
| Total gross loans |
1,984,149
|
2,001,163
|
| Mortgage loans |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
317,454
|
1,029,345
|
| 2023 |
947,515
|
2,049,829
|
| 2022 |
2,069,494
|
3,036,316
|
| 2021 |
3,000,362
|
1,925,522
|
| 2020 |
1,849,846
|
1,680,796
|
| Prior to 2020 |
5,166,103
|
3,569,951
|
| Revolving Loans |
141,565
|
140,939
|
| Revolving loans to term loans |
12,262
|
12,453
|
| Total gross loans |
13,504,601
|
13,445,151
|
| Mortgage loans | Total classified and criticized |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
2,984
|
3,709
|
| 2023 |
553
|
9,194
|
| 2022 |
21,939
|
22,135
|
| 2021 |
36,589
|
23,635
|
| 2020 |
65,675
|
35,620
|
| Prior to 2020 |
168,334
|
147,105
|
| Revolving Loans |
4,436
|
4,461
|
| Revolving loans to term loans |
0
|
0
|
| Total gross loans |
300,510
|
245,859
|
| Mortgage loans | Special Mention |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
0
|
665
|
| 2023 |
553
|
6,797
|
| 2022 |
6,960
|
10,494
|
| 2021 |
28,059
|
9,127
|
| 2020 |
48,125
|
14,569
|
| Prior to 2020 |
75,236
|
88,833
|
| Revolving Loans |
4,436
|
4,461
|
| Revolving loans to term loans |
0
|
0
|
| Total gross loans |
163,369
|
134,946
|
| Mortgage loans | Substandard |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
2,984
|
3,044
|
| 2023 |
0
|
2,397
|
| 2022 |
14,979
|
11,641
|
| 2021 |
8,530
|
14,508
|
| 2020 |
17,550
|
21,051
|
| Prior to 2020 |
93,098
|
58,272
|
| Revolving Loans |
0
|
0
|
| Revolving loans to term loans |
0
|
0
|
| Total gross loans |
137,141
|
110,913
|
| Mortgage 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 gross loans |
0
|
0
|
| Mortgage 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 gross loans |
0
|
0
|
| Mortgage loans | Pass/Watch |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
314,470
|
1,025,636
|
| 2023 |
946,962
|
2,040,635
|
| 2022 |
2,047,555
|
3,014,181
|
| 2021 |
2,963,773
|
1,901,887
|
| 2020 |
1,784,171
|
1,645,176
|
| Prior to 2020 |
4,997,769
|
3,422,846
|
| Revolving Loans |
137,129
|
136,478
|
| Revolving loans to term loans |
12,262
|
12,453
|
| Total gross loans |
13,204,091
|
13,199,292
|
| Mortgage loans | Commercial |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| Total gross loans |
7,295,651
|
7,228,078
|
| Mortgage loans | Construction |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| Total gross loans |
756,356
|
823,503
|
| Mortgage loans | Residential |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| Total gross loans |
1,994,404
|
2,010,637
|
| Consumer loans |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
11,171
|
31,975
|
| 2023 |
35,468
|
45,700
|
| 2022 |
42,655
|
59,672
|
| 2021 |
56,512
|
40,089
|
| 2020 |
39,141
|
9,557
|
| Prior to 2020 |
85,409
|
84,158
|
| Revolving Loans |
328,408
|
328,782
|
| Revolving loans to term loans |
14,689
|
13,886
|
| Total gross loans |
613,453
|
613,819
|
| Consumer loans | Total classified and criticized |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
0
|
0
|
| 2023 |
0
|
95
|
| 2022 |
0
|
3
|
| 2021 |
0
|
9
|
| 2020 |
9
|
124
|
| Prior to 2020 |
449
|
430
|
| Revolving Loans |
1,454
|
1,675
|
| Revolving loans to term loans |
147
|
0
|
| Total gross loans |
2,059
|
2,336
|
| Consumer loans | Special Mention |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
0
|
0
|
| 2023 |
0
|
0
|
| 2022 |
0
|
3
|
| 2021 |
0
|
0
|
| 2020 |
0
|
124
|
| Prior to 2020 |
204
|
109
|
| Revolving Loans |
600
|
725
|
| Revolving loans to term loans |
146
|
0
|
| Total gross loans |
950
|
961
|
| Consumer loans | Substandard |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
0
|
0
|
| 2023 |
0
|
95
|
| 2022 |
0
|
0
|
| 2021 |
0
|
9
|
| 2020 |
9
|
0
|
| Prior to 2020 |
245
|
321
|
| Revolving Loans |
854
|
950
|
| Revolving loans to term loans |
1
|
0
|
| Total gross loans |
1,109
|
1,375
|
| 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 gross 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 gross loans |
0
|
0
|
| Consumer loans | Pass/Watch |
|
|
| Financing Receivable, Credit Quality Indicator [Line Items] |
|
|
| 2024 |
11,171
|
31,975
|
| 2023 |
35,468
|
45,605
|
| 2022 |
42,655
|
59,669
|
| 2021 |
56,512
|
40,080
|
| 2020 |
39,132
|
9,433
|
| Prior to 2020 |
84,960
|
83,728
|
| Revolving Loans |
326,954
|
327,107
|
| Revolving loans to term loans |
14,542
|
13,886
|
| Total gross loans |
$ 611,394
|
$ 611,483
|