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Bank segment - Loan modifications (Details) - Troubled debt restructurings real estate loans $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) contract	Sep. 30, 2020 USD ($) contract	Sep. 30, 2021 USD ($) contract	Sep. 30, 2020 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number  of contracts | contract	3	2	26	12
Outstanding recorded investment	$ 3,075	$ 52	$ 13,843	$ 16,752
Related allowance	$ 304	$ 45	$ 588	$ 4,222
Real estate | Residential 1-4 family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number  of contracts | contract	1	0	16	1
Outstanding recorded investment	$ 442	$ 0	$ 10,363	$ 146
Related allowance	$ 81	$ 0	$ 309	$ 7
Real estate | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number  of contracts | contract	0	0	0	2
Outstanding recorded investment	$ 0	$ 0	$ 0	$ 16,149
Related allowance	$ 0	$ 0	$ 0	$ 4,019
Real estate | Home equity line of credit
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number  of contracts | contract	0	0	0	2
Outstanding recorded investment	$ 0	$ 0	$ 0	$ 22
Related allowance	$ 0	$ 0	$ 0	$ 1
Real estate | Residential land
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number  of contracts | contract	1	0	3	2
Outstanding recorded investment	$ 247	$ 0	$ 802	$ 228
Related allowance	$ 11	$ 0	$ 37	$ 15
Real estate | Commercial construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number  of contracts | contract	0	0	0	0
Outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Related allowance	$ 0	$ 0	$ 0	$ 0
Real estate | Residential construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number  of contracts | contract	0	0	0	0
Outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Related allowance	$ 0	$ 0	$ 0	$ 0
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number  of contracts | contract	1	2	7	5
Outstanding recorded investment	$ 2,386	$ 52	$ 2,678	$ 207
Related allowance	$ 212	$ 45	$ 242	$ 180
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number  of contracts | contract	0	0	0	0
Outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Related allowance	$ 0	$ 0	$ 0	$ 0

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+ References

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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=123577603&loc=SL6953676-111524

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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