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Bank segment - Loan modifications (Details) - Troubled debt restructurings real estate loans $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) contract	Jun. 30, 2018 USD ($) contract	Jun. 30, 2019 USD ($) contract	Jun. 30, 2018 USD ($) contract
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	7	22	17	44
Outstanding recorded investment	$ 2,922	$ 3,303	$ 4,265	$ 7,493
Net increase in allowance	$ 346	$ 621	$ 394	$ 996
Residential 1-4 family
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	1	0	9	0
Outstanding recorded investment	$ 469	$ 0	$ 1,501	$ 0
Net increase in allowance	$ 154	$ 0	$ 161	$ 0
Commercial real estate
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	0	0	0
Outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Net increase in allowance	$ 0	$ 0	$ 0	$ 0
Home equity line of credit
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	2	20	3	37
Outstanding recorded investment	$ 311	$ 3,260	$ 432	$ 5,293
Net increase in allowance	$ 59	$ 578	$ 83	$ 953
Residential land
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	2	0	2	0
Outstanding recorded investment	$ 825	$ 0	$ 825	$ 0
Net increase in allowance	$ 0	$ 0	$ 0	$ 0
Commercial construction
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	0	0	0
Outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Net increase in allowance	$ 0	$ 0	$ 0	$ 0
Residential construction
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	0	0	0
Outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Net increase in allowance	$ 0	$ 0	$ 0	$ 0
Commercial loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	2	2	3	7
Outstanding recorded investment	$ 1,317	$ 43	$ 1,507	$ 2,200
Net increase in allowance	$ 133	$ 43	$ 150	$ 43
Consumer loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	0	0	0	0
Outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Net increase in allowance	$ 0	$ 0	$ 0	$ 0

X

- 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

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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