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Loans, net and allowance for loan losses - Loans Modified Resulting in Troubled Debt Restructurings (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) loan contract | Dec. 31, 2018 USD ($) loan contract | Dec. 31, 2017 USD ($) loan | Dec. 31, 2017 USD ($) contract | Dec. 31, 2017 USD ($)
Loans in the formal process of foreclosure | $ 665,000 | $ 1,823,000 |  |  |
Number of loans modified | 1 | 1 | 6 | 6 |
Pre-Modification Outstanding Recorded Investment |  |  |  |  | $ 1,670,000
Post-Modification Outstanding Recorded Investment |  |  |  |  | 1,670,000
Recorded Investment |  |  | $ 1,628,000 | $ 1,628,000 | 1,628,000
Number of defaults on loans restructured | $ 0 | $ 0 |  |  | 0
Loans receivable, related parties, considered as nonaccrual, past due or restructured or potential credit risk | $ 2,193,000 | $ 2,779,000 |  |  |
Commercial |  |  |  |  |
Number of loans modified | contract |  |  |  | 2 |
Pre-Modification Outstanding Recorded Investment |  |  |  |  | 885,000
Post-Modification Outstanding Recorded Investment |  |  |  |  | 885,000
Recorded Investment |  |  | 864,000 | $ 864,000 | 864,000
Real estate Commercial |  |  |  |  |
Number of loans modified | contract | 1 | 1 |  | 3 |
Pre-Modification Outstanding Recorded Investment | $ 346,000 | $ 340,000 |  |  | 721,000
Post-Modification Outstanding Recorded Investment | 346,000 | 340,000 |  |  | 721,000
Recorded Investment | $ 241,000 | $ 340,000 | 700,000 | $ 700,000 | 700,000
Real estate Residential |  |  |  |  |
Number of loans modified | contract |  |  |  | 1 |
Pre-Modification Outstanding Recorded Investment |  |  |  |  | 64,000
Post-Modification Outstanding Recorded Investment |  |  |  |  | 64,000
Recorded Investment |  |  | $ 64,000 | $ 64,000 | $ 64,000

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- Definition Loans made to related parties which are considered nonaccrual, past due, restructured or a potential credit risk. + References No definition available. + Details
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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 + Details
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- Definition 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 + Details
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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 + Details
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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 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554 + Details
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- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL49126937-111524 + Details
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