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Loans Receivable and Allowance for Loan Losses - Troubled Debt Restructurings on Financing Receivables (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($) loan	Jun. 30, 2018 USD ($) loan	Jun. 30, 2019 USD ($) loan	Jun. 30, 2018 USD ($) loan	Dec. 31, 2018 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Specific reserves for the TDRs that had payment defaults	$ 85,000	$ 33,000	$ 119,000	$ 33,000
Charge offs	67,000	51,000	29,000	51,000
Specific reserves	31,000	44,000	52,000	1,100,000
Total charge-offs of TDR loans modified	33,000	$ 131,000	33,000	$ 131,000
Troubled debt restructured	$ 57,050,000		$ 57,050,000		$ 64,012,000
Number of modified contracts | loan	19	14	34	23
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 2,327,000	$ 4,302,000	$ 5,430,000	$ 15,262,000
Post-Modification	$ 2,327,000	$ 4,302,000	$ 5,430,000	$ 15,760,000
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	12	4	13	6
Balance	$ 588,000	$ 1,188,000	$ 656,000	$ 4,296,000
Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Temporary modifications, period of interest only payments			3 months
Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Temporary modifications, period of interest only payments			6 months
Legacy Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	15	12	28	18
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 1,207,000	$ 2,954,000	$ 4,177,000	$ 9,946,000
Post-Modification	$ 1,207,000	$ 2,954,000	$ 4,177,000	$ 9,946,000
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	7	4	7	4
Balance	$ 131,000	$ 1,188,000	$ 131,000	$ 1,188,000
Acquired Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	4	2	6	5
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 1,120,000	$ 1,348,000	$ 1,253,000	$ 5,316,000
Post-Modification	$ 1,120,000	$ 1,348,000	$ 1,253,000	$ 5,814,000
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	5	0	6	2
Balance	$ 457,000	$ 0	$ 525,000	$ 3,108,000
Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	10,659,000		10,659,000		9,065,000
Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	39,008,000		39,008,000		48,899,000
Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	7,383,000		7,383,000		6,048,000
TDR on accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	40,731,000		40,731,000		50,410,000
TDR on accrual | Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	6,055,000		6,055,000		6,103,000
TDR on accrual | Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	27,666,000		27,666,000		38,660,000
TDR on accrual | Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	7,010,000		7,010,000		5,647,000
TDR on non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	16,319,000		16,319,000		13,602,000
TDR on non-accrual | Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	4,604,000		4,604,000		2,962,000
TDR on non-accrual | Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	11,342,000		11,342,000		10,239,000
TDR on non-accrual | Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	$ 373,000		$ 373,000		401,000
Commercial | TDR on accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured					$ 24,000,000.0
Number of modified contracts | loan			15		20
Real estate | Legacy Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	0	0	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0	0
Balance	$ 0	$ 0	$ 0	$ 0
Real estate | Legacy Loans | Residential Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	0	0	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0	$ 0
Real estate | Legacy Loans | Retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	0	1	0	2
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 54,000	$ 0	$ 66,000
Post-Modification	$ 0	$ 54,000	$ 0	$ 66,000
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0	0
Balance	$ 0	$ 0	$ 0	$ 0
Real estate | Legacy Loans | Hotel & motel
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	1	0	2	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 730,000	$ 0	$ 880,000	$ 0
Post-Modification	$ 730,000	$ 0	$ 880,000	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0	0
Balance	$ 0	$ 0	$ 0	$ 0
Real estate | Legacy Loans | Gas station & car wash
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	0	0	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0	0
Balance	$ 0	$ 0	$ 0	$ 0
Real estate | Legacy Loans | Mixed use
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	0	0	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0	0
Balance	$ 0	$ 0	$ 0	$ 0
Real estate | Legacy Loans | Industrial & warehouse
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	0	0	0	1
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0	$ 0	$ 2,093,000
Post-Modification	$ 0	$ 0	$ 0	$ 2,093,000
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0	0
Balance	$ 0	$ 0	$ 0	$ 0
Real estate | Legacy Loans | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	0	0	1	1
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0	$ 92,000	$ 1,231,000
Post-Modification	$ 0	$ 0	$ 92,000	$ 1,231,000
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	1	0	1	0
Balance	$ 92,000	$ 0	$ 92,000	$ 0
Real estate | Acquired Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	0	0	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0	0
Balance	$ 0	$ 0	$ 0	$ 0
Real estate | Acquired Loans | Residential Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	0	0	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0	$ 498,000
Real estate | Acquired Loans | Retail
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	1	0	2	1
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 27,000	$ 0	$ 125,000	$ 207,000
Post-Modification	$ 27,000	$ 0	$ 125,000	$ 207,000
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0	0
Balance	$ 0	$ 0	$ 0	$ 0
Real estate | Acquired Loans | Hotel & motel
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	0	0	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	1	0	1	0
Balance	$ 73,000	$ 0	$ 73,000	$ 0
Real estate | Acquired Loans | Gas station & car wash
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	0	0	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0	0
Balance	$ 0	$ 0	$ 0	$ 0
Real estate | Acquired Loans | Mixed use
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	0	0	0	1
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0	$ 0	$ 2,714,000
Post-Modification	$ 0	$ 0	$ 0	$ 2,714,000
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0	0
Balance	$ 0	$ 0	$ 0	$ 0
Real estate | Acquired Loans | Industrial & warehouse
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	0	0	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	1	0	1	0
Balance	$ 234,000	$ 0	$ 234,000	$ 0
Real estate | Acquired Loans | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	2	0	2	1
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 961,000	$ 0	$ 961,000	$ 1,047,000
Post-Modification	$ 961,000	$ 0	$ 961,000	$ 1,047,000
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0	1
Balance	$ 0	$ 0	$ 0	$ 3,108,000
Real estate | Payment concession | Legacy Loans
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan			1
Balance			$ 92,000
Real estate | Payment concession | Acquired Loans
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan			4	1
Balance			$ 218,000	$ 3,100,000
Real estate | Commercial | TDR on accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	23,137,000		23,137,000		$ 24,026,000
Real estate | Commercial | TDR on accrual | Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	5,034,000		5,034,000		5,142,000
Real estate | Commercial | TDR on accrual | Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	13,556,000		13,556,000		14,012,000
Real estate | Commercial | TDR on accrual | Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	4,547,000		4,547,000		4,872,000
Real estate | Commercial | TDR on non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	4,424,000		4,424,000		2,617,000
Real estate | Commercial | TDR on non-accrual | Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	4,051,000		4,051,000		2,216,000
Real estate | Commercial | TDR on non-accrual | Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	0		0		0
Real estate | Commercial | TDR on non-accrual | Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	$ 373,000		$ 373,000		401,000
Commercial business | Legacy Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	7	10	12	13
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 447,000	$ 2,830,000	$ 3,143,000	$ 6,486,000
Post-Modification	$ 447,000	$ 2,830,000	$ 3,143,000	$ 6,486,000
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	4	0	4
Balance	$ 0	$ 1,188,000	$ 0	$ 1,188,000
Commercial business | Acquired Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	1	2	2	2
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 132,000	$ 1,348,000	$ 167,000	$ 1,348,000
Post-Modification	$ 132,000	$ 1,348,000	$ 167,000	$ 1,348,000
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	3	0	4	1
Balance	$ 150,000	$ 0	$ 218,000	$ 0
Commercial business | Payment concession | Acquired Loans
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan			3
Balance			$ 218,000
Commercial business | Maturity / amortization concession | Legacy Loans
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan			1	4
Balance			$ 673,000	$ 1,200,000
Commercial business | TDR on accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	14,110,000		$ 14,110,000		$ 18,890,000
Number of modified contracts | loan			33		37
Commercial business | TDR on accrual | Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	960,000		$ 960,000		$ 961,000
Commercial business | TDR on accrual | Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	10,791,000		10,791,000		17,257,000
Commercial business | TDR on accrual | Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	2,359,000		2,359,000		672,000
Commercial business | TDR on non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	8,990,000		8,990,000		10,912,000
Commercial business | TDR on non-accrual | Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	553,000		553,000		746,000
Commercial business | TDR on non-accrual | Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	8,437,000		8,437,000		10,166,000
Commercial business | TDR on non-accrual | Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	$ 0		$ 0		0
Trade finance | Legacy Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	0	0	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0	0
Balance	$ 0	$ 0	$ 0	$ 0
Trade finance | Acquired Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	0	0	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0	0	0
Balance	$ 0	$ 0	$ 0	$ 0
Other | TDR on accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	3,484,000		3,484,000		7,494,000
Other | TDR on accrual | Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	61,000		61,000		0
Other | TDR on accrual | Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	3,319,000		3,319,000		7,391,000
Other | TDR on accrual | Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	104,000		104,000		103,000
Other | TDR on non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	2,905,000		2,905,000		73,000
Other | TDR on non-accrual | Payment concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	0		0		0
Other | TDR on non-accrual | Maturity / amortization concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	2,905,000		2,905,000		73,000
Other | TDR on non-accrual | Rate concession
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	$ 0		$ 0		0
Consumer and other | Legacy Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	7	1	13	1
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 30,000	$ 70,000	$ 62,000	$ 70,000
Post-Modification	$ 30,000	$ 70,000	$ 62,000	$ 70,000
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	6	0
Balance	$ 39,000	$ 0
Consumer and other | Acquired Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified contracts | loan	0	0	0	0
Troubled Debt Restructuring, By Loan Class
Pre-Modification	$ 0	$ 0	$ 0	$ 0
Post-Modification	$ 0	$ 0	$ 0	$ 0
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Consumer and other | Payment concession | Legacy Loans
Troubled Debt Restructuring, By Loan Class, Modified And Subsequent Payment Default
Number of Loans | loan			6
Balance			$ 39,000
Consumer and other | TDR on accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled debt restructured	$ 3,500,000		$ 3,500,000		$ 7,500,000
Number of modified contracts | loan			14		6

X

- Definition

Financing Receivable, Impaired, Troubled Debt Restructuring, Modifications, Write-down

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No definition available.

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Financing Receivable, Modifications, Related Allowance, Loans Modified During Period

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No definition available.

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Financing Receivables, Impaired, Troubled Debt Restructuring, Related Allowance Loans Modified During Period

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- Definition

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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No definition available.

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Trouble Debt Restructuring By Loan Class [Abstract]

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Troubled Debt Restructuring Loans, Modified And Subsequent Payment Default [Abstract]

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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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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- Definition

Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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