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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Risk Categories for Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	$ 417,811	$ 816,955
Origination year - 1 year prior to current fiscal year	748,899	840,484
Origination year - 2 years prior to current fiscal year	797,644	880,048
Origination year - 3 years prior to current fiscal year	801,322	457,039
Origination year - 4 years prior to current fiscal year	441,200	503,551
Origination year - more than 4 years prior to current fiscal year	1,124,825	739,203
Revolving Loans Amortized Cost Basis	1,402,142	1,640,519
Revolving Loans Amortized Cost Basis Converted to Term	30,558	20,606
Total	5,764,401	5,898,405
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	42,010	99,015
Origination year - 1 year prior to current fiscal year	84,758	93,648
Origination year - 2 years prior to current fiscal year	95,668	79,258
Origination year - 3 years prior to current fiscal year	76,252	65,390
Origination year - 4 years prior to current fiscal year	63,588	46,110
Origination year - more than 4 years prior to current fiscal year	133,746	103,664
Revolving Loans Amortized Cost Basis	1,357,319	1,586,357
Revolving Loans Amortized Cost Basis Converted to Term	24,984	14,866
Total	1,878,325	2,088,308
Commercial | Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	42,010	99,015
Origination year - 1 year prior to current fiscal year	81,257	78,783
Origination year - 2 years prior to current fiscal year	74,627	70,248
Origination year - 3 years prior to current fiscal year	67,474	52,786
Origination year - 4 years prior to current fiscal year	51,189	44,536
Origination year - more than 4 years prior to current fiscal year	118,729	92,129
Revolving Loans Amortized Cost Basis	1,342,027	1,572,259
Revolving Loans Amortized Cost Basis Converted to Term	13,507	9,945
Total	1,790,820	2,019,701
Commercial | Commercial and industrial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	3,501	928
Origination year - 2 years prior to current fiscal year	3,984	2,748
Origination year - 3 years prior to current fiscal year	2,702	7,986
Origination year - 4 years prior to current fiscal year	12,399	1,574
Origination year - more than 4 years prior to current fiscal year	6,007	2,271
Revolving Loans Amortized Cost Basis	1,500	1,500
Revolving Loans Amortized Cost Basis Converted to Term	7,506	225
Total	37,599	17,232
Commercial | Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	13,937
Origination year - 2 years prior to current fiscal year	17,057	6,262
Origination year - 3 years prior to current fiscal year	6,076	4,618
Origination year - 4 years prior to current fiscal year	0	0
Origination year - more than 4 years prior to current fiscal year	9,010	9,264
Revolving Loans Amortized Cost Basis	13,792	12,598
Revolving Loans Amortized Cost Basis Converted to Term	3,971	4,696
Total	49,906	51,375
Commercial | Commercial and industrial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Origination year - more than 4 years prior to current fiscal year	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	0	0
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	111,377	75,432
Origination year - 1 year prior to current fiscal year	66,607	150,731
Origination year - 2 years prior to current fiscal year	148,505	202,283
Origination year - 3 years prior to current fiscal year	180,602	63,144
Origination year - 4 years prior to current fiscal year	62,798	93,972
Origination year - more than 4 years prior to current fiscal year	262,053	213,608
Revolving Loans Amortized Cost Basis	6,443	6,443
Revolving Loans Amortized Cost Basis Converted to Term	1,580	1,582
Total	839,965	807,195
Commercial | Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	111,377	75,432
Origination year - 1 year prior to current fiscal year	66,607	150,731
Origination year - 2 years prior to current fiscal year	147,993	192,831
Origination year - 3 years prior to current fiscal year	171,212	63,144
Origination year - 4 years prior to current fiscal year	62,798	91,454
Origination year - more than 4 years prior to current fiscal year	229,419	182,756
Revolving Loans Amortized Cost Basis	2,682	2,682
Revolving Loans Amortized Cost Basis Converted to Term	1,580	1,582
Total	793,668	760,612
Commercial | Commercial real estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	9,452
Origination year - 3 years prior to current fiscal year	9,390	0
Origination year - 4 years prior to current fiscal year	0	2,518
Origination year - more than 4 years prior to current fiscal year	16,964	14,754
Revolving Loans Amortized Cost Basis	3,761	3,761
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	30,115	30,485
Commercial | Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	512	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Origination year - more than 4 years prior to current fiscal year	14,451	16,098
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	14,963	16,098
Commercial | Commercial real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Origination year - more than 4 years prior to current fiscal year	1,219	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	1,219	0
Commercial | Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	16,566	239,449
Origination year - 1 year prior to current fiscal year	235,977	409,582
Origination year - 2 years prior to current fiscal year	386,364	275,881
Origination year - 3 years prior to current fiscal year	268,034	110,105
Origination year - 4 years prior to current fiscal year	109,761	97,160
Origination year - more than 4 years prior to current fiscal year	241,536	157,616
Revolving Loans Amortized Cost Basis	40	27
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	1,258,278	1,289,820
Commercial | Multifamily | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	16,566	239,449
Origination year - 1 year prior to current fiscal year	235,977	407,532
Origination year - 2 years prior to current fiscal year	383,314	275,881
Origination year - 3 years prior to current fiscal year	268,034	110,105
Origination year - 4 years prior to current fiscal year	109,761	97,160
Origination year - more than 4 years prior to current fiscal year	221,183	154,841
Revolving Loans Amortized Cost Basis	40	27
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	1,234,875	1,284,995
Commercial | Multifamily | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	2,050
Origination year - 2 years prior to current fiscal year	3,050	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Origination year - more than 4 years prior to current fiscal year	801	803
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	3,851	2,853
Commercial | Multifamily | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Origination year - more than 4 years prior to current fiscal year	19,552	1,972
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	19,552	1,972
Commercial | Multifamily | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Origination year - more than 4 years prior to current fiscal year	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	0	0
Commercial | SBA
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	130,594	211,962
Origination year - 1 year prior to current fiscal year	151,088	15,850
Origination year - 2 years prior to current fiscal year	15,750	1,650
Origination year - 3 years prior to current fiscal year	1,615	5,277
Origination year - 4 years prior to current fiscal year	5,126	12,184
Origination year - more than 4 years prior to current fiscal year	31,723	21,318
Revolving Loans Amortized Cost Basis	1,222	3,337
Revolving Loans Amortized Cost Basis Converted to Term	1,785	1,866
Total	338,903	273,444
Commercial | SBA | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	130,594	211,962
Origination year - 1 year prior to current fiscal year	151,088	14,082
Origination year - 2 years prior to current fiscal year	13,995	1,260
Origination year - 3 years prior to current fiscal year	1,224	3,746
Origination year - 4 years prior to current fiscal year	3,648	11,087
Origination year - more than 4 years prior to current fiscal year	27,863	18,589
Revolving Loans Amortized Cost Basis	953	3,111
Revolving Loans Amortized Cost Basis Converted to Term	384	1,014
Total	329,749	264,851
Commercial | SBA | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	1,768
Origination year - 2 years prior to current fiscal year	1,755	0
Origination year - 3 years prior to current fiscal year	0	212
Origination year - 4 years prior to current fiscal year	206	415
Origination year - more than 4 years prior to current fiscal year	1,265	874
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	5	6
Total	3,231	3,275
Commercial | SBA | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	1,319
Origination year - 4 years prior to current fiscal year	1,272	682
Origination year - more than 4 years prior to current fiscal year	2,595	1,855
Revolving Loans Amortized Cost Basis	269	226
Revolving Loans Amortized Cost Basis Converted to Term	1,306	755
Total	5,442	4,837
Commercial | SBA | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	390
Origination year - 3 years prior to current fiscal year	391	0
Origination year - 4 years prior to current fiscal year	0	0
Origination year - more than 4 years prior to current fiscal year	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	90	91
Total	481	481
Commercial | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	1,177	41,677
Origination year - 1 year prior to current fiscal year	45,148	30,387
Origination year - 2 years prior to current fiscal year	29,576	46,934
Origination year - 3 years prior to current fiscal year	36,968	50,024
Origination year - 4 years prior to current fiscal year	48,817	6,994
Origination year - more than 4 years prior to current fiscal year	7,436	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	169,122	176,016
Commercial | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	1,177	41,677
Origination year - 1 year prior to current fiscal year	45,148	30,387
Origination year - 2 years prior to current fiscal year	29,576	45,397
Origination year - 3 years prior to current fiscal year	32,931	50,024
Origination year - 4 years prior to current fiscal year	48,817	0
Origination year - more than 4 years prior to current fiscal year	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	157,649	167,485
Commercial | Construction | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	1,537
Origination year - 3 years prior to current fiscal year	4,037	0
Origination year - 4 years prior to current fiscal year	0	6,994
Origination year - more than 4 years prior to current fiscal year	7,436	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	11,473	8,531
Commercial | Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Origination year - more than 4 years prior to current fiscal year	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	0	0
Commercial | Construction | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Origination year - more than 4 years prior to current fiscal year	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	0	0
Consumer | Single family residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	116,087	149,382
Origination year - 1 year prior to current fiscal year	165,321	140,286
Origination year - 2 years prior to current fiscal year	121,781	273,995
Origination year - 3 years prior to current fiscal year	237,817	163,099
Origination year - 4 years prior to current fiscal year	151,110	247,131
Origination year - more than 4 years prior to current fiscal year	446,436	241,091
Revolving Loans Amortized Cost Basis	14,699	15,252
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	1,253,251	1,230,236
Consumer | Single family residential mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	116,087	149,382
Origination year - 1 year prior to current fiscal year	165,321	140,129
Origination year - 2 years prior to current fiscal year	120,880	271,667
Origination year - 3 years prior to current fiscal year	225,492	161,332
Origination year - 4 years prior to current fiscal year	147,342	237,285
Origination year - more than 4 years prior to current fiscal year	415,134	227,711
Revolving Loans Amortized Cost Basis	14,442	15,252
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	1,204,698	1,202,758
Consumer | Single family residential mortgage | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	901	1,837
Origination year - 3 years prior to current fiscal year	3,144	688
Origination year - 4 years prior to current fiscal year	685	4,868
Origination year - more than 4 years prior to current fiscal year	9,456	4,460
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	14,186	11,853
Consumer | Single family residential mortgage | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	157
Origination year - 2 years prior to current fiscal year	0	491
Origination year - 3 years prior to current fiscal year	9,181	1,079
Origination year - 4 years prior to current fiscal year	3,083	4,978
Origination year - more than 4 years prior to current fiscal year	21,846	8,920
Revolving Loans Amortized Cost Basis	257	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	34,367	15,625
Consumer | Single family residential mortgage | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Origination year - more than 4 years prior to current fiscal year	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	0	0
Consumer | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	38
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	47
Origination year - 3 years prior to current fiscal year	34	0
Origination year - 4 years prior to current fiscal year	0	0
Origination year - more than 4 years prior to current fiscal year	1,895	1,906
Revolving Loans Amortized Cost Basis	22,419	29,103
Revolving Loans Amortized Cost Basis Converted to Term	2,209	2,292
Total	26,557	33,386
Consumer | Other consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	38
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	47
Origination year - 3 years prior to current fiscal year	34	0
Origination year - 4 years prior to current fiscal year	0	0
Origination year - more than 4 years prior to current fiscal year	1,865	1,876
Revolving Loans Amortized Cost Basis	22,256	27,644
Revolving Loans Amortized Cost Basis Converted to Term	2,137	2,218
Total	26,292	31,823
Consumer | Other consumer | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Origination year - more than 4 years prior to current fiscal year	30	30
Revolving Loans Amortized Cost Basis	64	1,185
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	94	1,215
Consumer | Other consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Origination year - more than 4 years prior to current fiscal year	0	0
Revolving Loans Amortized Cost Basis	99	274
Revolving Loans Amortized Cost Basis Converted to Term	72	74
Total	171	348
Consumer | Other consumer | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - current fiscal year	0	0
Origination year - 1 year prior to current fiscal year	0	0
Origination year - 2 years prior to current fiscal year	0	0
Origination year - 3 years prior to current fiscal year	0	0
Origination year - 4 years prior to current fiscal year	0	0
Origination year - more than 4 years prior to current fiscal year	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Amortized Cost Basis Converted to Term	0	0
Total	$ 0	$ 0

X

- Definition

Amount of financing receivable originated more than five years prior to current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

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-Name Accounting Standards Codification
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-Section 50
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Amount of financing receivable originated four years prior to current fiscal year.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

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-Publisher FASB
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-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447

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- Definition

Amount of financing receivable originated in current fiscal year.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of financing receivable originated in fiscal year prior to current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447

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