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Bank segment - Credit risk profile - summary (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Credit risk profile based on nonaccrual loans
Nonaccrual loans	$ 46,913	$ 46,035
Accruing loans 90 days or more past due	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	28,625	22,246
Residential 1-4 family
Credit risk profile based on nonaccrual loans
Nonaccrual loans	21,028	20,554
Financing Receivable, Modifications, Post-Modification Recorded Investment	13,803	13,962
Commercial real estate
Credit risk profile based on nonaccrual loans
Nonaccrual loans	3,727	1,188
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Home equity line of credit
Credit risk profile based on nonaccrual loans
Nonaccrual loans	2,801	2,254
Financing Receivable, Modifications, Post-Modification Recorded Investment	2,643	2,467
Residential land
Credit risk profile based on nonaccrual loans
Nonaccrual loans	698	970
Financing Receivable, Modifications, Post-Modification Recorded Investment	3,779	4,713
Commercial construction
Credit risk profile based on nonaccrual loans
Nonaccrual loans	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Residential construction
Credit risk profile based on nonaccrual loans
Nonaccrual loans	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0
Commercial loans
Credit risk profile based on nonaccrual loans
Nonaccrual loans	17,862	20,174
Financing Receivable, Modifications, Post-Modification Recorded Investment	8,400	1,104
Consumer loans
Credit risk profile based on nonaccrual loans
Nonaccrual loans	797	895
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524

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- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524

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+ References

No definition available.

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