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Bank segment - Loan modifications (Details) - Troubled debt restructurings real estate loans $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) contract	Mar. 31, 2015 USD ($) contract
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	17	15
Pre-modification outstanding recorded investment	$ 17,966	$ 1,398
Post-modification outstanding recorded investment	18,084	1,416
Net increases in ALL	$ 760	$ 102
Residential 1-4 family
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	4	5
Pre-modification outstanding recorded investment	$ 1,097	$ 877
Post-modification outstanding recorded investment	1,215	895
Net increases in ALL	$ 161	$ 47
Home equity line of credit
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	10	9
Pre-modification outstanding recorded investment	$ 669	$ 429
Post-modification outstanding recorded investment	669	429
Net increases in ALL	$ 74	$ 55
Residential land
Financing Receivable, Modifications [Line Items]
Number of contracts | contract		0
Pre-modification outstanding recorded investment		$ 0
Post-modification outstanding recorded investment		0
Net increases in ALL		$ 0
Commercial loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	3	1
Pre-modification outstanding recorded investment	$ 16,200	$ 92
Post-modification outstanding recorded investment	16,200	92
Net increases in ALL	$ 525	$ 0

X

- Definition

The number of contracts under financing receivables that have been modified by troubled debt restructurings during the period.

+ References

No definition available.

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- Definition

The amount of the outstanding recorded investment in financial receivables after the financial receivables being modified as troubled debt restructurings.

+ References

No definition available.

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- Definition

The amount of the outstanding recorded investment in financial receivables prior to the financial receivables being modified as troubled debt restructurings.

+ References

No definition available.

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- Definition

Amount of increase (decrease) of allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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