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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, 2016 USD ($) contract	Jun. 30, 2015 USD ($) contract	Jun. 30, 2016 USD ($) contract	Jun. 30, 2015 USD ($) contract
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	19	18	36	33
Pre-modification outstanding recorded investment	$ 2,236	$ 1,169	$ 20,202	$ 2,567
Post-modification outstanding recorded investment	2,231	1,169	20,315	2,585
Net increases in ALL	$ 424	$ 183	$ 1,184	$ 285
Residential 1-4 family
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	5	2	9	7
Pre-modification outstanding recorded investment	$ 891	$ 318	$ 1,988	$ 1,195
Post-modification outstanding recorded investment	885	318	2,100	1,213
Net increases in ALL	$ 98	$ 0	$ 259	$ 47
Home equity line of credit
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	8	13	18	22
Pre-modification outstanding recorded investment	$ 768	$ 690	$ 1,437	$ 1,119
Post-modification outstanding recorded investment	768	690	1,437	1,119
Net increases in ALL	$ 181	$ 105	$ 255	$ 160
Residential land
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	1	0	1	0
Pre-modification outstanding recorded investment	$ 120	$ 0	$ 120	$ 0
Post-modification outstanding recorded investment	121	0	121	0
Net increases in ALL	$ 0	$ 0	$ 0	$ 0
Commercial loans
Financing Receivable, Modifications [Line Items]
Number of contracts | contract	5	3	8	4
Pre-modification outstanding recorded investment	$ 457	$ 161	$ 16,657	$ 253
Post-modification outstanding recorded investment	457	161	16,657	253
Net increases in ALL	$ 145	$ 78	$ 670	$ 78

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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X

- 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.

+ Details

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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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