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Loans Receivable and Allowance for Loan Losses - Troubled Debt Restructurings on Financing Receivables (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	$ 64,012,000	$ 78,490,000
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	35	33	19
Pre-Modification	$ 20,026,000	$ 27,375,000	$ 15,406,000
Post-Modification	$ 20,026,000	$ 27,375,000	$ 15,699,000
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	10	5	6
Balance	$ 5,377,000	$ 3,677,000	$ 616,000
Specific reserves	262,000	1,400,000	1,200,000
Specific reserves for the TDRs	131,000	60,000	371,000
Specific reserves allocated to TDRs	3,000,000	4,800,000	$ 5,300,000
Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	9,065,000	26,167,000
Maturity/ Amortization concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	48,899,000	44,692,000
Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	6,048,000	7,631,000
TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	50,410,000	67,250,000
TDR on accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	6,103,000	22,926,000
TDR on accrual | Maturity/ Amortization concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	38,660,000	37,794,000
TDR on accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	5,647,000	6,530,000
TDR on non-accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	13,602,000	11,240,000
TDR on non-accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	2,962,000	3,241,000
TDR on non-accrual | Maturity/ Amortization concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	10,239,000	6,898,000
TDR on non-accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	$ 401,000	$ 1,101,000
Real estate-Commercial | TDR on accrual
Financing Receivable, Modifications [Line Items]
Number of TDRs on accrual status | loan	20	24
Commercial Business | TDR on accrual
Financing Receivable, Modifications [Line Items]
Number of TDRs on accrual status | loan	37	27
Consumer | TDR on accrual
Financing Receivable, Modifications [Line Items]
Number of TDRs on accrual status | loan	6	7
Real Estate | Real estate-Commercial | TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	$ 24,026,000	$ 32,762,000
Real Estate | Real estate-Commercial | TDR on accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	5,142,000	22,550,000
Real Estate | Real estate-Commercial | TDR on accrual | Maturity/ Amortization concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	14,012,000	4,768,000
Real Estate | Real estate-Commercial | TDR on accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	4,872,000	5,444,000
Real Estate | Real estate-Commercial | TDR on non-accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	2,617,000	5,690,000
Real Estate | Real estate-Commercial | TDR on non-accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	2,216,000	3,071,000
Real Estate | Real estate-Commercial | TDR on non-accrual | Maturity/ Amortization concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	1,536,000
Real Estate | Real estate-Commercial | TDR on non-accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	401,000	1,083,000
Commercial Business | TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	18,890,000	26,956,000
Commercial Business | TDR on accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	961,000	376,000
Commercial Business | TDR on accrual | Maturity/ Amortization concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	17,257,000	25,584,000
Commercial Business | TDR on accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	672,000	996,000
Commercial Business | TDR on non-accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	10,912,000	5,452,000
Commercial Business | TDR on non-accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	746,000	170,000
Commercial Business | TDR on non-accrual | Maturity/ Amortization concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	10,166,000	5,264,000
Commercial Business | TDR on non-accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	18,000
Commercial Business | Commercial Business | TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	18,900,000
Trade Finance and Other | TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	7,494,000	7,532,000
Trade Finance and Other | TDR on accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0
Trade Finance and Other | TDR on accrual | Maturity/ Amortization concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	7,391,000	7,442,000
Trade Finance and Other | TDR on accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	103,000	90,000
Trade Finance and Other | TDR on non-accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	73,000	98,000
Trade Finance and Other | TDR on non-accrual | Payment concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0
Trade Finance and Other | TDR on non-accrual | Maturity/ Amortization concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	73,000	98,000
Trade Finance and Other | TDR on non-accrual | Rate concession
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	0	0
Consumer and Other | Consumer | TDR on accrual
Financing Receivable, Modifications [Line Items]
Troubled debt restructured	$ 7,500,000	$ 7,500,000
Legacy
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	24	18	16
Pre-Modification	$ 15,271,000	$ 11,098,000	$ 13,986,000
Post-Modification	$ 15,271,000	$ 11,098,000	$ 14,328,000
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	6	2	4
Balance	$ 4,958,000	$ 178,000	$ 580,000
Charge offs	$ 180,000	$ 0	$ 4,000
Subsequent default, number of loans | loan	6	2	4
Legacy | Real Estate | Retail
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	1	0	0
Subsequent default, number of loans | loan	0	0	0
Subsequent default, recorded investment	$ 0	$ 0	$ 0
Legacy | Real Estate | Hotel & Motel
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	1	0	0
Balance		$ 0	$ 0
Legacy | Real Estate | Gas Station & Car Wash
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0
Balance		$ 0	$ 0
Legacy | Real Estate | Mixed Use
Financing Receivable, Modifications [Line Items]
Number of TDRs on accrual status | loan	0	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 0	$ 0
Legacy | Real Estate | Industrial & Warehouse
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	1	0	0
Balance	$ 2,070,000
Legacy | Real Estate | Other
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	1	0	0
Legacy | Real Estate | Payment concession
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Subsequent default, number of loans | loan	2
Subsequent default, recorded investment	$ 787,000
Legacy | Real Estate | Payment concession | Hotel & Motel
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Balance	734,000
Legacy | Real Estate | Payment concession | Gas Station & Car Wash
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Balance	$ 0
Legacy | Real Estate | Payment concession | Industrial & Warehouse
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Balance		$ 0	$ 0
Legacy | Real Estate | Payment concession | Other
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Balance		0	0
Legacy | Real Estate | Maturity/ Amortization concession
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Subsequent default, number of loans | loan	2
Subsequent default, recorded investment	$ 3,300,000
Legacy | Real Estate | Maturity/ Amortization concession | Retail
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Balance	53,000	$ 0	$ 0
Legacy | Real Estate | Rate concession | Other
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Balance	$ 1,215,000
Legacy | Real Estate | Real estate-Residential
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0	0	0
Pre-Modification	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0
Legacy | Real Estate | Real estate-Commercial | Retail
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	2	2	0
Pre-Modification	$ 53,000	$ 1,082,000	$ 0
Post-Modification	$ 53,000	$ 1,082,000	$ 0
Legacy | Real Estate | Real estate-Commercial | Hotel & Motel
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0	1	0
Pre-Modification	$ 0	$ 1,044,000	$ 0
Post-Modification	$ 0	$ 1,044,000	$ 0
Legacy | Real Estate | Real estate-Commercial | Gas Station & Car Wash
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0	0	0
Pre-Modification	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0
Legacy | Real Estate | Real estate-Commercial | Mixed Use
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0	0	0
Pre-Modification	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0
Legacy | Real Estate | Real estate-Commercial | Industrial & Warehouse
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	1	1	0
Pre-Modification	$ 2,070,000	$ 465,000	$ 0
Post-Modification	$ 2,070,000	$ 465,000	$ 0
Legacy | Real Estate | Real estate-Commercial | Other
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	1	0	3
Pre-Modification	$ 1,215,000	$ 0	$ 1,675,000
Post-Modification	$ 1,215,000	$ 0	$ 6,824,000
Legacy | Real Estate | Real estate-Construction
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0	0	0
Pre-Modification	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0
Balance	$ 0	$ 0	$ 0
Legacy | Commercial Business
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	2	2	4
Balance		$ 178,000	$ 580,000
Legacy | Commercial Business | Payment concession
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Subsequent default, number of loans | loan		1	3
Subsequent default, recorded investment		$ 40,000	$ 490,000
Legacy | Commercial Business | Maturity/ Amortization concession
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Balance	$ 886,000
Subsequent default, number of loans | loan	2	1	1
Subsequent default, recorded investment	$ 886,000	$ 138,000	$ 90,000
Legacy | Commercial Business | Commercial Business
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	18	14	12
Pre-Modification	$ 10,972,000	$ 8,507,000	$ 12,311,000
Post-Modification	$ 10,972,000	$ 8,507,000	$ 7,413,000
Legacy | Trade Finance
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Subsequent default, number of loans | loan	0	0	0
Subsequent default, recorded investment	$ 0	$ 0	$ 0
Legacy | Trade Finance and Other | Trade Finance
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	1	0	0
Pre-Modification	$ 898,000	$ 0	$ 0
Post-Modification	$ 898,000	$ 0	$ 0
Legacy | Consumer and Other
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	1	0	1
Pre-Modification	$ 63,000	$ 0	$ 0
Post-Modification	$ 63,000	$ 0	$ 91,000
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0
Legacy | Consumer and Other | Maturity/ Amortization concession
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Balance	$ 0	$ 0	$ 0
Acquired
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	11	15	3
Pre-Modification	$ 4,755,000	$ 16,277,000	$ 1,420,000
Post-Modification	$ 4,755,000	$ 16,277,000	$ 1,371,000
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	4	3	2
Balance	$ 419,000	$ 3,499,000	$ 36,000
Charge offs	$ 0	$ 0	$ 4,000
Subsequent default, number of loans | loan	3	3	2
Acquired | Real estate-Construction
Troubled Debt Restructuring, By Loan Class
Post-Modification			$ 0
Acquired | Real Estate | Retail
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0
Balance	$ 0	$ 0	$ 0
Subsequent default, number of loans | loan	0	0	0
Subsequent default, recorded investment	$ 0	$ 0	$ 0
Acquired | Real Estate | Hotel & Motel
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	1	0
Acquired | Real Estate | Gas Station & Car Wash
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0
Acquired | Real Estate | Mixed Use
Financing Receivable, Modifications [Line Items]
Number of TDRs on accrual status | loan	0	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 0	$ 0
Acquired | Real Estate | Industrial & Warehouse
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	1	0	0
Balance	$ 230,000	$ 0	$ 0
Acquired | Real Estate | Other
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	1	0
Balance	$ 0	$ 2,977,000	$ 0
Acquired | Real Estate | Rate concession | Hotel & Motel
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Balance	0	482,000	0
Acquired | Real Estate | Rate concession | Gas Station & Car Wash
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Balance	$ 0	$ 0	$ 0
Acquired | Real Estate | Real estate-Residential
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0	0	0
Pre-Modification	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0
Acquired | Real Estate | Real estate-Commercial | Retail
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0	3	1
Pre-Modification	$ 0	$ 1,642,000	$ 1,377,000
Post-Modification	$ 0	$ 1,642,000	$ 1,335,000
Acquired | Real Estate | Real estate-Commercial | Hotel & Motel
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0	1	0
Pre-Modification	$ 0	$ 482,000	$ 0
Post-Modification	$ 0	$ 482,000	$ 0
Acquired | Real Estate | Real estate-Commercial | Gas Station & Car Wash
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0	0	0
Pre-Modification	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0
Acquired | Real Estate | Real estate-Commercial | Mixed Use
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	1	0	0
Pre-Modification	$ 73,000	$ 0	$ 0
Post-Modification	$ 73,000	$ 0	$ 0
Acquired | Real Estate | Real estate-Commercial | Industrial & Warehouse
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0	0	0
Pre-Modification	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0
Acquired | Real Estate | Real estate-Commercial | Other
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	1	2	0
Pre-Modification	$ 2,688,000	$ 6,946,000	$ 0
Post-Modification	$ 2,688,000	$ 6,946,000	$ 0
Acquired | Real Estate | Real estate-Construction
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	1	0	0
Pre-Modification	$ 230,000	$ 0	$ 0
Post-Modification	$ 230,000	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0
Balance	$ 0	$ 0	$ 0
Acquired | Commercial Business
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	3	1	1
Acquired | Commercial Business | Payment concession
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Subsequent default, number of loans | loan	2	1	1
Subsequent default, recorded investment	$ 189,000		$ 11,000
Acquired | Commercial Business | Payment Concession And Rate Concession
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Balance	$ 189,000	$ 40,000	$ 11,000
Acquired | Commercial Business | Commercial Business
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0	8	1
Pre-Modification	$ 0	$ 4,224,000	$ 13,000
Post-Modification	$ 0	$ 4,224,000	$ 11,000
Acquired | Trade Finance
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Subsequent default, number of loans | loan	0	0	0
Subsequent default, recorded investment	$ 0	$ 0	$ 0
Acquired | Trade Finance and Other | Trade Finance
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	0	1	0
Pre-Modification	$ 0	$ 2,983,000	$ 0
Post-Modification	$ 0	$ 2,983,000	$ 0
Acquired | Consumer and Other
Troubled Debt Restructuring, By Loan Class
Number of Loans | loan	8	0	1
Pre-Modification	$ 1,764,000	$ 0	$ 30,000
Post-Modification	$ 1,764,000	$ 0	$ 25,000
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	1
Acquired | Consumer and Other | Maturity/ Amortization concession
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Balance	$ 0	$ 0	$ 25,000
Subsequent default, number of loans | loan	1	2	1
Subsequent default, recorded investment	$ 230,000	$ 3,500,000	$ 25,000
Minimum
Financing Receivable, Modifications [Line Items]
Temporary modifications, period of interest only payments	3 months
Maximum
Financing Receivable, Modifications [Line Items]
Temporary modifications, period of interest only payments	6 months

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Financing Receivable, Modifications, Executed in Period, Number of Contracts

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Financing Receivable, Modifications, Subsequent Default, Occurred in Period, Recorded Investment

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Reflects the amount of the write-down related to a troubled debt restructuring, within the previous 12 months, for which there was a payment default.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524

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- Definition

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+ References

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