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REVENUE FROM CONTRACT WITH CUSTOMERS (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Net interest income	$ 184,743,000	$ 148,696,000	$ 545,791,000	$ 422,555,000
Non-interest income	29,946,000	29,934,000	90,786,000	81,026,000
Total Revenue	214,689,000	178,630,000	636,577,000	503,581,000
Service charges and fees on deposit accounts [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	8,690,000	5,848,000	25,782,000	16,280,000
Insurance commissions [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	2,317,000	1,473,000	9,774,000	7,436,000
Total Revenue	0	0	3,300,000
Merchant-related income [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	2,421,000	2,217,000	6,277,000	4,105,000
Credit and debit card fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	7,313,000	5,142,000	20,407,000	13,513,000
Other service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	2,556,000	2,274,000	7,006,000	6,536,000
Not inscope of Topic 606 [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	6,649,000	12,980,000	21,540,000	33,156,000
Mortgage Banking Segment [Member]
Disaggregation of Revenue [Line Items]
Net interest income	26,535,000	20,666,000	78,106,000	55,177,000
Non-interest income	5,921,000	6,756,000	19,174,000	14,843,000
Total Revenue	32,456,000	27,422,000	97,280,000	70,020,000
Mortgage Banking Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	0	0	0	0
Mortgage Banking Segment [Member] | Insurance commissions [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	0	0	0	0
Mortgage Banking Segment [Member] | Merchant-related income [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	0	0	0	0
Mortgage Banking Segment [Member] | Credit and debit card fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	0	0	0	0
Mortgage Banking Segment [Member] | Other service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	211,000	49,000	561,000	215,000
Mortgage Banking Segment [Member] | Not inscope of Topic 606 [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	5,710,000	6,707,000	18,613,000	14,628,000
Consumer Retail Banking Segment [Member]
Disaggregation of Revenue [Line Items]
Net interest income	75,343,000	54,323,000	198,577,000	165,609,000
Non-interest income	17,544,000	12,315,000	51,513,000	36,634,000
Total Revenue	92,887,000	66,638,000	250,090,000	202,243,000
Consumer Retail Banking Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	5,076,000	3,021,000	14,518,000	8,777,000
Consumer Retail Banking Segment [Member] | Insurance commissions [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	2,183,000	1,377,000	9,137,000	6,933,000
Consumer Retail Banking Segment [Member] | Merchant-related income [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	1,878,000	1,941,000	4,710,000	3,535,000
Consumer Retail Banking Segment [Member] | Credit and debit card fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	6,897,000	4,778,000	19,163,000	12,380,000
Consumer Retail Banking Segment [Member] | Other service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	1,018,000	846,000	2,729,000	1,882,000
Consumer Retail Banking Segment [Member] | Not inscope of Topic 606 [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	492,000	352,000	1,256,000	3,127,000
Commercial And Corporate Segment [Member]
Disaggregation of Revenue [Line Items]
Net interest income	46,358,000	35,803,000	146,837,000	86,631,000
Non-interest income	3,894,000	2,838,000	11,930,000	7,673,000
Total Revenue	50,252,000	38,641,000	158,767,000	94,304,000
Commercial And Corporate Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	2,855,000	2,044,000	8,813,000	5,049,000
Commercial And Corporate Segment [Member] | Insurance commissions [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	0	0	0	0
Commercial And Corporate Segment [Member] | Merchant-related income [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	263,000	0	776,000	0
Commercial And Corporate Segment [Member] | Credit and debit card fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	22,000	16,000	62,000	45,000
Commercial And Corporate Segment [Member] | Other service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	715,000	700,000	1,927,000	1,591,000
Commercial And Corporate Segment [Member] | Not inscope of Topic 606 [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	39,000	78,000	352,000	988,000
Treasury And Investments Segment [Member]
Disaggregation of Revenue [Line Items]
Net interest income	12,756,000	18,577,000	53,378,000	55,549,000
Non-interest income	61,000	5,457,000	202,000	13,777,000
Total Revenue	12,817,000	24,034,000	53,580,000	69,326,000
Treasury And Investments Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	0	0	0	0
Treasury And Investments Segment [Member] | Insurance commissions [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	0	0	0	0
Treasury And Investments Segment [Member] | Merchant-related income [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	0	0	0	0
Treasury And Investments Segment [Member] | Credit and debit card fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	0	0	0	0
Treasury And Investments Segment [Member] | Other service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	0	0	0	89,000
Treasury And Investments Segment [Member] | Not inscope of Topic 606 [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	61,000	5,457,000	202,000	13,688,000
United States Operations Segment [Member]
Disaggregation of Revenue [Line Items]
Net interest income	17,255,000	12,918,000	48,684,000	39,939,000
Non-interest income	965,000	1,058,000	3,008,000	2,534,000
Total Revenue	18,220,000	13,976,000	51,692,000	42,473,000
United States Operations Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	128,000	125,000	412,000	416,000
United States Operations Segment [Member] | Insurance commissions [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	25,000	5,000	82,000	24,000
United States Operations Segment [Member] | Merchant-related income [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	14,000	0	39,000	0
United States Operations Segment [Member] | Credit and debit card fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	0	(2,000)	14,000	12,000
United States Operations Segment [Member] | Other service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	462,000	537,000	1,351,000	1,366,000
United States Operations Segment [Member] | Not inscope of Topic 606 [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	336,000	393,000	1,110,000	716,000
Virgin Islands Operations Segment [Member]
Disaggregation of Revenue [Line Items]
Net interest income	6,496,000	6,409,000	20,209,000	19,650,000
Non-interest income	1,561,000	1,510,000	4,959,000	5,565,000
Total Revenue	8,057,000	7,919,000	25,168,000	25,215,000
Virgin Islands Operations Segment [Member] | Service charges and fees on deposit accounts [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	631,000	658,000	2,039,000	2,038,000
Virgin Islands Operations Segment [Member] | Insurance commissions [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	109,000	91,000	555,000	479,000
Virgin Islands Operations Segment [Member] | Merchant-related income [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	266,000	276,000	752,000	570,000
Virgin Islands Operations Segment [Member] | Credit and debit card fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	394,000	350,000	1,168,000	1,076,000
Virgin Islands Operations Segment [Member] | Other service charges and fees [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	150,000	142,000	438,000	1,393,000
Virgin Islands Operations Segment [Member] | Not inscope of Topic 606 [Member]
Disaggregation of Revenue [Line Items]
Non-interest income	$ 11,000	$ (7,000)	$ 7,000	$ 9,000

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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