REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation Of Revenue [Line Items]
Net interest income (loss)	$ 196,520	$ 200,885
Noninterest Income	33,983	32,518
Total Revenues (Loss)	230,503	233,403
Other non-interest income	4,620	4,400
Service charges and fees on deposit accounts [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	9,662	9,541
Insurance commissions [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	5,507	4,847
Card and processing income [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	11,312	10,918
Other service charges and fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	2,739	3,094
Not in scope of Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	4,763	4,118
Mortgage Banking Segment [Member]
Disaggregation Of Revenue [Line Items]
Net interest income (loss)	15,823	21,788
Noninterest Income	3,019	3,074
Total Revenues (Loss)	18,842	24,862
Mortgage Banking Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0
Mortgage Banking Segment [Member] | Insurance commissions [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0
Mortgage Banking Segment [Member] | Card and processing income [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0
Mortgage Banking Segment [Member] | Other service charges and fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	58	161
Mortgage Banking Segment [Member] | Not in scope of Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	2,961	2,913
Consumer Retail Banking Segment [Member]
Disaggregation Of Revenue [Line Items]
Net interest income (loss)	148,947	137,744
Noninterest Income	23,406	22,034
Total Revenues (Loss)	172,353	159,778
Consumer Retail Banking Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	5,281	5,486
Consumer Retail Banking Segment [Member] | Insurance commissions [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	5,234	4,640
Consumer Retail Banking Segment [Member] | Card and processing income [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	10,238	9,901
Consumer Retail Banking Segment [Member] | Other service charges and fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	1,043	1,152
Consumer Retail Banking Segment [Member] | Not in scope of Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	1,610	855
Commercial And Corporate Segment [Member]
Disaggregation Of Revenue [Line Items]
Net interest income (loss)	14,928	14,940
Noninterest Income	4,501	4,175
Total Revenues (Loss)	19,429	19,115
Commercial And Corporate Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	3,492	3,154
Commercial And Corporate Segment [Member] | Insurance commissions [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0
Commercial And Corporate Segment [Member] | Card and processing income [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	24	22
Commercial And Corporate Segment [Member] | Other service charges and fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	876	854
Commercial And Corporate Segment [Member] | Not in scope of Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	109	145
Treasury And Investments Segment [Member]
Disaggregation Of Revenue [Line Items]
Net interest income (loss)	(6,532)	(658)
Noninterest Income	83	160
Total Revenues (Loss)	(6,449)	(498)
Treasury And Investments Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0
Treasury And Investments Segment [Member] | Insurance commissions [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0
Treasury And Investments Segment [Member] | Card and processing income [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0
Treasury And Investments Segment [Member] | Other service charges and fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0
Treasury And Investments Segment [Member] | Not in scope of Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	83	160
United States Operations Segment [Member]
Disaggregation Of Revenue [Line Items]
Net interest income (loss)	18,248	20,930
Noninterest Income	901	847
Total Revenues (Loss)	19,149	21,777
United States Operations Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	148	165
United States Operations Segment [Member] | Insurance commissions [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	56	28
United States Operations Segment [Member] | Card and processing income [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	78	31
United States Operations Segment [Member] | Other service charges and fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	621	583
United States Operations Segment [Member] | Not in scope of Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	(2)	40
Virgin Islands Operations Segment [Member]
Disaggregation Of Revenue [Line Items]
Net interest income (loss)	5,106	6,141
Noninterest Income	2,073	2,228
Total Revenues (Loss)	7,179	8,369
Virgin Islands Operations Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	741	736
Virgin Islands Operations Segment [Member] | Insurance commissions [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	217	179
Virgin Islands Operations Segment [Member] | Card and processing income [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	972	964
Virgin Islands Operations Segment [Member] | Other service charges and fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	141	344
Virgin Islands Operations Segment [Member] | Not in scope of Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	$ 2	$ 5