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Loans, net and allowance for loan losses - Loans Modified Resulting in Troubled Debt Restructurings (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) loan	Dec. 31, 2018 USD ($) contract	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) loan	Dec. 31, 2017 USD ($) contract	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) loan	Dec. 31, 2016 USD ($) contract	Dec. 31, 2016 USD ($)
Loans in the formal process of foreclosure	$ 1,823,000	$ 1,823,000	$ 1,823,000	$ 1,684,000	$ 1,684,000	$ 1,684,000
Number of loans modified	1	1		6	6		3	3
Pre-Modification Outstanding Recorded Investment			340,000			1,670,000			$ 1,716,000
Post-Modification Outstanding Recorded Investment			340,000			1,670,000			1,366,000
Recorded Investment	$ 340,000	$ 340,000	340,000	$ 1,628,000	$ 1,628,000	1,628,000	$ 1,357,000	$ 1,357,000	1,357,000
Number of defaults on loans restructured			0			0			1
Loans modified as troubled debt restructuring									43,000
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk	2,779,000	$ 2,779,000	2,779,000	3,074,000	$ 3,074,000	3,074,000
Commercial
Number of loans modified | contract					2			1
Pre-Modification Outstanding Recorded Investment						885,000			1,500,000
Post-Modification Outstanding Recorded Investment						885,000			1,150,000
Recorded Investment				864,000	$ 864,000	864,000	1,150,000	$ 1,150,000	1,150,000
Real estate Commercial
Number of loans modified | contract		1			3
Pre-Modification Outstanding Recorded Investment			340,000			721,000
Post-Modification Outstanding Recorded Investment			340,000			721,000
Recorded Investment	$ 340,000	$ 340,000	$ 340,000	700,000	$ 700,000	700,000
Real estate Residential
Number of loans modified | contract					1			2
Pre-Modification Outstanding Recorded Investment						64,000			216,000
Post-Modification Outstanding Recorded Investment						64,000			216,000
Recorded Investment				$ 64,000	$ 64,000	$ 64,000	$ 207,000	$ 207,000	$ 207,000

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- Definition

Loans made to related parties which are considered nonaccrual, past due, restructured or a potential credit risk.

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

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

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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