SEGMENT INFORMATION (Tables)	3 Months Ended
Mar. 31, 2026
SEGMENT INFORMATION [Abstract]
Information by Segment [Table Text Block]	The following tables present information about the reportable segments for the indicated periods: Mortgage Banking Consumer (Retail) Banking Commercial and Corporate Banking Treasury and Investments United States Operations Virgin Islands Operations Total (In thousands) Quarter ended March 31, 2026: Interest income $ 33,286 $ 102,130 $ 61,546 $ 35,948 $ 38,580 $ 8,359 $ 279,849 Net (charge) credit for transfer of funds (15,484) 79,089 (13,039) (58,678) (1,638) 9,750 - Interest expense - (36,256) (3,852) (2,371) (15,045) (1,369) (58,893) Net interest income (loss) 17,802 144,963 44,655 (25,101) 21,897 16,740 220,956 Provision for credit losses - (benefit) expense (329) 18,582 (3,306) 88 1,392 846 17,273 Non-interest income 4,408 27,540 2,303 35 907 2,492 37,685 Non-interest expenses: Employees’ compensation and benefits 7,022 39,827 5,172 1,258 7,418 4,602 65,299 Occupancy and equipment 1,378 15,198 1,351 179 1,857 2,100 22,063 Business promotion 241 2,527 209 173 298 107 3,555 Professional fees 1,629 7,736 992 376 1,026 1,153 12,912 Taxes, other than income taxes 492 4,648 660 121 91 172 6,184 FDIC deposit insurance 376 675 629 - 244 134 2,058 Net (gain) loss on OREO operations (1,016) - (11) - - 90 (937) Credit and debit card processing expenses - 6,451 191 - 2 683 7,327 Other non-interest expenses (1) 817 5,565 390 229 714 929 8,644 Total non-interest expenses 10,939 82,627 9,583 2,336 11,650 9,970 127,105 Segment income (loss) $ 11,600 $ 71,294 $ 40,681 $ (27,490) $ 9,762 $ 8,416 $ 114,263 Average interest-earning assets $ 2,202,958 $ 3,975,633 $ 3,755,974 $ 5,274,088 $ 2,578,130 $ 478,759 $ 18,265,542 Mortgage Banking Consumer (Retail) Banking Commercial and Corporate Banking Treasury and Investments United States Operations Virgin Islands Operations Total (In thousands) Quarter ended March 31, 2025: Interest income $ 32,064 $ 105,753 $ 61,872 $ 32,638 $ 37,400 $ 7,338 $ 277,065 Net (charge) credit for transfer of funds (14,478) 75,097 (15,280) (54,717) (1,039) 10,417 - Interest expense - (37,835) (3,783) (5,580) (15,572) (1,898) (64,668) Net interest income (loss) 17,586 143,015 42,809 (27,659) 20,789 15,857 212,397 Provision for credit losses - expense (benefit) 676 20,020 2,654 (5) 849 616 24,810 Non-interest income 3,582 26,193 2,257 151 854 2,697 35,734 Non-interest expenses: Employees’ compensation and benefits 6,972 36,619 5,764 1,140 6,999 4,643 62,137 Occupancy and equipment 1,517 15,129 1,604 173 1,878 2,329 22,630 Business promotion 203 2,320 218 170 273 94 3,278 Professional fees 1,540 6,244 1,042 348 948 1,364 11,486 Taxes, other than income taxes 471 4,394 605 120 117 171 5,878 FDIC deposit insurance 415 778 668 - 237 138 2,236 Net (gain) loss on OREO operations (1,096) - 36 - - (69) (1,129) Credit and debit card processing expenses - 4,002 260 - 2 846 5,110 Other non-interest expenses (1) 972 6,733 1,412 648 711 920 11,396 Total non-interest expenses 10,994 76,219 11,609 2,599 11,165 10,436 123,022 Segment income (loss) $ 9,498 $ 72,969 $ 30,803 $ (30,102) $ 9,629 $ 7,502 $ 100,299 Average interest-earning assets $ 2,156,558 $ 4,056,039 $ 3,550,790 $ 5,730,140 $ 2,391,708 $ 426,092 $ 18,311,327 (1) Consists of communication expenses and the expense categories described in Note 16 - “Other Non-Interest Expenses,” to the audited consolidated financial statements included in the 2025 Annual Report on Form 10-K.
Reconciliation of the Reportable Segment Financial Information [Table Text Block]	The following table presents a reconciliation of the reportable segment financial information to the consolidated totals for the indicated periods: Quarter Ended March 31, 2026 2025 (In thousands) Average assets: Total average interest-earning assets for segments $ 18,265,542 $ 18,311,327 Average non-interest-earning assets (1) 803,696 795,775 Total consolidated average assets $ 19,069,238 $ 19,107,102 (1) Includes, among other things, non-interest-earning cash, premises and equipment, net deferred tax asset, right-of-use ("ROU") assets, and accrued interest receivable on loans and investments.

The following tables present information about the reportable segments for

the indicated periods:

Mortgage

Banking

Consumer

(Retail) Banking

Commercial and

Corporate

Banking

Treasury and

Investments

United States

Operations

Virgin Islands

Operations

Total

(In thousands)

Quarter ended March 31, 2026:

Interest income

33,286

102,130

61,546

35,948

38,580

8,359

279,849

Net (charge) credit for transfer of funds

(15,484)

79,089

(13,039)

(58,678)

(1,638)

9,750

Interest expense

(36,256)

(3,852)

(2,371)

(15,045)

(1,369)

(58,893)

Net interest income (loss)

17,802

144,963

44,655

(25,101)

21,897

16,740

220,956

Provision for credit losses - (benefit) expense

(329)

18,582

(3,306)

1,392

846

17,273

Non-interest income

4,408

27,540

2,303

907

2,492

37,685

Non-interest expenses:

Employees’ compensation and benefits

7,022

39,827

5,172

1,258

7,418

4,602

65,299

Occupancy and equipment

1,378

15,198

1,351

179

1,857

2,100

22,063

Business promotion

241

2,527

209

173

298

107

3,555

Professional fees

1,629

7,736

992

376

1,026

1,153

12,912

Taxes, other than income taxes

492

4,648

660

121

172

6,184

FDIC deposit insurance

376

675

629

244

134

2,058

Net (gain) loss on OREO operations

(1,016)

(11)

(937)

Credit and debit card processing expenses

6,451

191

683

7,327

Other non-interest expenses

(1)

817

5,565

390

229

714

929

8,644

Total non-interest expenses

10,939

82,627

9,583

2,336

11,650

9,970

127,105

Segment income (loss)

11,600

71,294

40,681

(27,490)

9,762

8,416

114,263

Average interest-earning assets

2,202,958

3,975,633

3,755,974

5,274,088

2,578,130

478,759

18,265,542

Mortgage

Banking

Consumer

(Retail) Banking

Commercial and

Corporate

Banking

Treasury and

Investments

United States

Operations

Virgin Islands

Operations

Total

(In thousands)

Quarter ended March 31, 2025:

Interest income

32,064

105,753

61,872

32,638

37,400

7,338

277,065

Net (charge) credit for transfer of funds

(14,478)

75,097

(15,280)

(54,717)

(1,039)

10,417

Interest expense

(37,835)

(3,783)

(5,580)

(15,572)

(1,898)

(64,668)

Net interest income (loss)

17,586

143,015

42,809

(27,659)

20,789

15,857

212,397

Provision for credit losses - expense (benefit)

676

20,020

2,654

(5)

849

616

24,810

Non-interest income

3,582

26,193

2,257

151

854

2,697

35,734

Non-interest expenses:

Employees’ compensation and benefits

6,972

36,619

5,764

1,140

6,999

4,643

62,137

Occupancy and equipment

1,517

15,129

1,604

173

1,878

2,329

22,630

Business promotion

203

2,320

218

170

273

3,278

Professional fees

1,540

6,244

1,042

348

948

1,364

11,486

Taxes, other than income taxes

471

4,394

605

120

117

171

5,878

FDIC deposit insurance

415

778

668

237

138

2,236

Net (gain) loss on OREO operations

(1,096)

(69)

(1,129)

Credit and debit card processing expenses

4,002

260

846

5,110

Other non-interest expenses

(1)

972

6,733

1,412

648

711

920

11,396

Total non-interest expenses

10,994

76,219

11,609

2,599

11,165

10,436

123,022

Segment income (loss)

9,498

72,969

30,803

(30,102)

9,629

7,502

100,299

Average interest-earning assets

2,156,558

4,056,039

3,550,790

5,730,140

2,391,708

426,092

18,311,327

(1) Consists of communication expenses and the expense categories described in Note 16 - “Other Non-Interest Expenses,” to the audited consolidated financial statements included in the 2025 Annual Report on Form 10-K.