REVENUE FROM CONTRACTS WITH CUSTOMERS (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Net interest income	$ 795,293	$ 729,929	$ 600,322
Noninterest Income	123,092	121,164	111,226
Total Revenues	918,385	851,093	711,548
Other non-interest income	15,850	12,429	16,225
Service charges and fees on deposit accounts [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	37,823	35,284	24,612
Insurance commissions [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	13,743	11,945	9,364
Total Revenues	3,200	3,300	3,300
Other non-interest income		5,000
Merchant-related income [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	9,514	8,464	5,844
Credit and debit card fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	30,902	28,064	19,765
Other service charges and fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	11,093	9,977	8,994
Not inscope of Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	20,017	27,430	42,647
Mortgage Banking Segment [Member]
Disaggregation Of Revenue [Line Items]
Net interest income	98,920	104,638	76,025
Noninterest Income	15,950	24,278	22,069
Total Revenues	114,870	128,916	98,094
Mortgage Banking Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0	0
Mortgage Banking Segment [Member] | Insurance commissions [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0	0
Mortgage Banking Segment [Member] | Merchant-related income [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0	0
Mortgage Banking Segment [Member] | Credit and debit card fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0	0
Mortgage Banking Segment [Member] | Other service charges and fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	341	771	342
Mortgage Banking Segment [Member] | Not inscope of Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	15,609	23,507	21,727
Consumer Retail Banking Segment [Member]
Disaggregation Of Revenue [Line Items]
Net interest income	442,624	281,703	220,678
Noninterest Income	78,457	69,774	50,962
Total Revenues	521,081	351,477	271,640
Consumer Retail Banking Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	21,906	20,083	13,286
Consumer Retail Banking Segment [Member] | Insurance commissions [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	12,733	11,166	8,754
Consumer Retail Banking Segment [Member] | Merchant-related income [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	6,622	6,279	4,516
Consumer Retail Banking Segment [Member] | Credit and debit card fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	29,061	26,360	18,218
Consumer Retail Banking Segment [Member] | Other service charges and fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	4,558	4,185	2,900
Consumer Retail Banking Segment [Member] | Not inscope of Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	3,577	1,701	3,288
Commercial And Corporate Segment [Member]
Disaggregation Of Revenue [Line Items]
Net interest income	109,822	191,917	135,591
Noninterest Income	18,189	16,032	12,606
Total Revenues	128,011	207,949	148,197
Commercial And Corporate Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	12,412	11,807	8,026
Commercial And Corporate Segment [Member] | Insurance commissions [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0	0
Commercial And Corporate Segment [Member] | Merchant-related income [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	1,483	1,079	478
Commercial And Corporate Segment [Member] | Credit and debit card fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	85	83	62
Commercial And Corporate Segment [Member] | Other service charges and fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	3,397	2,640	2,260
Commercial And Corporate Segment [Member] | Not inscope of Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	812	423	1,780
Treasury And Investments Segment [Member]
Disaggregation Of Revenue [Line Items]
Net interest income	39,600	59,331	87,879
Noninterest Income	(74)	227	13,708
Total Revenues	39,526	59,558	101,587
Treasury And Investments Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0	0
Treasury And Investments Segment [Member] | Insurance commissions [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0	0
Treasury And Investments Segment [Member] | Merchant-related income [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0	0
Treasury And Investments Segment [Member] | Credit and debit card fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0	0
Treasury And Investments Segment [Member] | Other service charges and fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	0	0	184
Treasury And Investments Segment [Member] | Not inscope of Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	(74)	227	13,524
United States Operations Segment [Member]
Disaggregation Of Revenue [Line Items]
Net interest income	80,485	65,967	54,025
Noninterest Income	2,860	3,963	4,630
Total Revenues	83,345	69,930	58,655
United States Operations Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	607	555	553
United States Operations Segment [Member] | Insurance commissions [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	15	114	52
United States Operations Segment [Member] | Merchant-related income [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	74	51	41
United States Operations Segment [Member] | Credit and debit card fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	(7)	19	16
United States Operations Segment [Member] | Other service charges and fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	2,113	1,825	1,800
United States Operations Segment [Member] | Not inscope of Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	58	1,399	2,168
Virgin Islands Operations Segment [Member]
Disaggregation Of Revenue [Line Items]
Net interest income	23,842	26,373	26,124
Noninterest Income	7,710	6,890	7,251
Total Revenues	31,552	33,263	33,375
Virgin Islands Operations Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	2,898	2,839	2,747
Virgin Islands Operations Segment [Member] | Insurance commissions [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	995	665	558
Virgin Islands Operations Segment [Member] | Merchant-related income [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	1,335	1,055	809
Virgin Islands Operations Segment [Member] | Credit and debit card fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	1,763	1,602	1,469
Virgin Islands Operations Segment [Member] | Other service charges and fees [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	684	556	1,508
Virgin Islands Operations Segment [Member] | Not inscope of Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Noninterest Income	$ 35	$ 173	$ 160