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Loans, net and allowance for loan losses - Loans Modified Resulting in Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($) loan	Jun. 30, 2017 USD ($) loan	Jun. 30, 2018 USD ($) loan	Jun. 30, 2017 USD ($) loan	Dec. 31, 2017 USD ($)
Pre-Modification Outstanding Recorded Investment | $			$ 3,307	$ 2,152	$ 3,074
Number of defaults on loans restructured	0	0		0
Loans modified as troubled debt restructuring | $				$ 409
Number of loans modified as troubled debt restructuring				2
Real estate Commercial
Loans modified as troubled debt restructuring | $	$ 340		$ 340
Number of loans modified as troubled debt restructuring	1		1
Real estate Residential
Number of defaults on loans restructured			1
Loans modified as troubled debt restructuring | $		$ 64	$ 58
Number of loans modified as troubled debt restructuring		1

X

- Definition

Represents the number of defaults on loans restructured.

+ References

No definition available.

+ Details

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- Definition

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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- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524

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- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

+ 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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