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Bank segment - Loan modifications (Details) - Troubled debt restructurings real estate loans $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 USD ($) contract | Mar. 31, 2019 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 7 | 12
Outstanding recorded investment | $ 17,488 | $ 1,842
Net increase in allowance | $ 4,567 | $ 45
Residential 1-4 family |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 1 | 8
Outstanding recorded investment | $ 148 | $ 1,048
Net increase in allowance | $ 8 | $ 5
Commercial real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 2 | 0
Outstanding recorded investment | $ 16,584 | $ 0
Net increase in allowance | $ 4,281 | $ 0
Home equity line of credit |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 0 | 2
Outstanding recorded investment | $ 0 | $ 264
Net increase in allowance | $ 0 | $ 23
Residential land |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 0 | 1
Outstanding recorded investment | $ 0 | $ 335
Net increase in allowance | $ 0 | $ 0
Commercial construction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 0 | 0
Outstanding recorded investment | $ 0 | $ 0
Net increase in allowance | $ 0 | $ 0
Residential construction |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 0 | 0
Outstanding recorded investment | $ 0 | $ 0
Net increase in allowance | $ 0 | $ 0
Commercial loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 4 | 1
Outstanding recorded investment | $ 756 | $ 195
Net increase in allowance | $ 278 | $ 17
Consumer loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of contracts | contract | 0 | 0
Outstanding recorded investment | $ 0 | $ 0
Net increase in allowance | $ 0 | $ 0

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- Definition Amount of increase (decrease) of allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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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