XML 74 R63.htm IDEA: XBRL DOCUMENT v3.21.2

Note 8 - Loans - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021		Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Balance	$ 131,256	[1]	$ 169,680	$ 166,538	$ 123,224
Provision/(reversal) for possible credit losses	3,000		12,500	(15,710)	62,500
Charge-offs	(2,652)		(6,956)	(19,502)	(13,383)
Recoveries	(341)		(3,906)	(2,179)	(6,789)
Net (charge-offs)/recoveries	(2,311)		(3,050)	(17,323)	(6,594)
Balance	131,945		179,130	131,945	179,130
Recoveries	341		3,906	2,179	6,789
Reserve for impaired loans			8,495		8,495
Reserve for non-impaired loans			170,635		170,635
Reserve for off-balance sheet credit commitments			5,663		5,663
Commitments to Extend Credit [Member]
Balance	8,050	[1]		5,880
Provision/(reversal) for possible credit losses	50			(3,798)
Balance	8,100			8,100
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance				(1,560)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member]
Balance				6,018
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance				164,978
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member]
Balance				11,898
Commercial Portfolio Segment [Member]
Balance	40,067	[1]	82,256	68,742	57,021
Provision/(reversal) for possible credit losses	674		298	18,891	29,402
Charge-offs	(2,649)		(6,956)	(19,499)	(13,383)
Recoveries	(121)		(3,796)	(1,545)	(6,354)
Net (charge-offs)/recoveries	(2,528)		(3,160)	(17,954)	(7,029)
Balance	38,213		79,394	38,213	79,394
Recoveries	121		3,796	1,545	6,354
Reserve for impaired loans			7,704		7,704
Reserve for non-impaired loans			71,690		71,690
Reserve for off-balance sheet credit commitments			4,297		4,297
Commercial Portfolio Segment [Member] | Commitments to Extend Credit [Member]
Balance	4,388	[1]		4,802
Provision/(reversal) for possible credit losses	329			(3,321)
Balance	4,717			4,717
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance				(31,466)
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member]
Balance				3,236
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance				37,276
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member]
Balance				8,038
Real Estate Construction Portfolio Segment [Member]
Balance	6,119	[1]	26,700	30,854	19,474
Provision/(reversal) for possible credit losses	149		6,012	(279)	13,238
Charge-offs	0		0	0	0
Recoveries	(76)		0	(76)	0
Net (charge-offs)/recoveries	76		0	76	0
Balance	6,344		32,712	6,344	32,712
Recoveries	76		0	76	0
Reserve for impaired loans			0		0
Reserve for non-impaired loans			32,712		32,712
Reserve for off-balance sheet credit commitments			896		896
Real Estate Construction Portfolio Segment [Member] | Commitments to Extend Credit [Member]
Balance	3,581	[1]		690
Provision/(reversal) for possible credit losses	(396)			(640)
Balance	3,185			3,185
Real Estate Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance				(24,307)
Real Estate Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member]
Balance				3,135
Real Estate Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance				6,547
Real Estate Construction Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member]
Balance				3,825
Commercial Real Estate Portfolio Segment [Member]
Balance	58,026	[1]	41,132	49,205	33,602
Provision/(reversal) for possible credit losses	2,786		5,438	(23,526)	12,718
Charge-offs	0		0	0	0
Recoveries	(144)		(95)	(284)	(345)
Net (charge-offs)/recoveries	144		95	284	345
Balance	60,956		46,665	60,956	46,665
Recoveries	144		95	284	345
Reserve for impaired loans			582		582
Reserve for non-impaired loans			46,083		46,083
Reserve for off-balance sheet credit commitments			172		172
Commercial Real Estate Portfolio Segment [Member] | Commitments to Extend Credit [Member]
Balance	81	[1]		101
Provision/(reversal) for possible credit losses	117			163
Balance	198			198
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance				34,993
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member]
Balance				(66)
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance				84,198
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member]
Balance				35
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Balance	27,043	[1]	19,592	17,737	13,108
Provision/(reversal) for possible credit losses	(609)		752	(10,788)	7,161
Charge-offs	(3)		0	(3)	0
Recoveries	0		(15)	(274)	(90)
Net (charge-offs)/recoveries	(3)		15	271	90
Balance	26,431		20,359	26,431	20,359
Recoveries	0		15	274	90
Reserve for impaired loans			209		209
Reserve for non-impaired loans			20,150		20,150
Reserve for off-balance sheet credit commitments			294		294
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Commitments to Extend Credit [Member]
Balance	0	[1]		284
Provision/(reversal) for possible credit losses	0			0
Balance	0			0
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance				19,211
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member]
Balance				(284)
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance				36,948
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member]
Balance				0
Installment and Other Loans [Member ]
Balance	1	[1]	0	0	19
Provision/(reversal) for possible credit losses	0		0	(8)	(19)
Charge-offs	0		0	0	0
Recoveries	0		0	0	0
Net (charge-offs)/recoveries	0		0	0	0
Balance	1		0	1	0
Recoveries	0		0	(0)	0
Reserve for impaired loans			0		0
Reserve for non-impaired loans			0		0
Reserve for off-balance sheet credit commitments			$ 4		$ 4
Installment and Other Loans [Member ] | Commitments to Extend Credit [Member]
Balance	0	[1]		3
Provision/(reversal) for possible credit losses	0			0
Balance	$ 0			0
Installment and Other Loans [Member ] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance				9
Installment and Other Loans [Member ] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Commitments to Extend Credit [Member]
Balance				(3)
Installment and Other Loans [Member ] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Balance				9
Installment and Other Loans [Member ] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commitments to Extend Credit [Member]
Balance				$ 0
[1] Balance sheet amounts previously reported for the impact of the initial adoption of CECL on January 1, 2021 have been corrected. The correction decreased the allowance for loan losses by $2.2 million and increased the allowance for unfunded credit commitments by $5.5 million.

X

- Definition

Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss.

+ References

No definition available.

+ Details

Name:	caty_FinancingReceivableAllowanceForCreditLossWriteoffAfterRecoveryNet
Namespace Prefix:	caty_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Reserve For Off-Balance Sheet Credit Commitments

+ References

No definition available.

+ Details

Name:	caty_ReserveForOffBalanceSheetCreditCommitments
Namespace Prefix:	caty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Reserve To Impaired Loans

+ References

No definition available.

+ Details

Name:	caty_ReserveToImpairedLoans
Namespace Prefix:	caty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Reserve To Non-Impaired Loans

+ References

No definition available.

+ Details

Name:	caty_ReserveToNonImpairedLoans
Namespace Prefix:	caty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7)(2))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (3)

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (c)

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (1)

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of increase in allowance for credit loss on financing receivable from recovery.

+ 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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

Reference 3: 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

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of credit loss expense (reversal of expense) for financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(11))
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

+ Details

Name:	us-gaap_ProvisionForLoanLossesExpensed
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201613Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=caty_RealEstateConstructionPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=caty_ResidentialMortgageAndEquityLinesPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=caty_InstallmentAndOtherLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: