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Bank segment - Credit risk profile - payment activity (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Credit risk profile based on payment activity for loans
Total past due	$ 24,647	$ 23,603
Current	4,730,025	4,647,974
Total financing receivables	4,754,672	4,671,577
Recorded Investment greater than 90 days and accruing	0	0
30-59 days past due
Credit risk profile based on payment activity for loans
Total past due	9,107	7,237
60-89 days past due
Credit risk profile based on payment activity for loans
Total past due	5,364	6,013
Greater than 90 days
Credit risk profile based on payment activity for loans
Total past due	10,176	10,353
Residential 1-4 family
Credit risk profile based on payment activity for loans
Total past due	8,386	8,318
Current	2,102,103	2,109,729
Total financing receivables	2,110,489	2,118,047
Recorded Investment greater than 90 days and accruing	0	0
Residential 1-4 family | 30-59 days past due
Credit risk profile based on payment activity for loans
Total past due	2,000	1,532
Residential 1-4 family | 60-89 days past due
Credit risk profile based on payment activity for loans
Total past due	2,254	1,715
Residential 1-4 family | Greater than 90 days
Credit risk profile based on payment activity for loans
Total past due	4,132	5,071
Commercial real estate
Credit risk profile based on payment activity for loans
Total past due	0	0
Current	733,749	733,106
Total financing receivables	733,749	733,106
Recorded Investment greater than 90 days and accruing	0	0
Commercial real estate | 30-59 days past due
Credit risk profile based on payment activity for loans
Total past due	0	0
Commercial real estate | 60-89 days past due
Credit risk profile based on payment activity for loans
Total past due	0	0
Commercial real estate | Greater than 90 days
Credit risk profile based on payment activity for loans
Total past due	0	0
Home equity line of credit
Credit risk profile based on payment activity for loans
Total past due	5,062	2,590
Current	944,810	910,462
Total financing receivables	949,872	913,052
Recorded Investment greater than 90 days and accruing	0	0
Home equity line of credit | 30-59 days past due
Credit risk profile based on payment activity for loans
Total past due	1,375	425
Home equity line of credit | 60-89 days past due
Credit risk profile based on payment activity for loans
Total past due	493	114
Home equity line of credit | Greater than 90 days
Credit risk profile based on payment activity for loans
Total past due	3,194	2,051
Residential land
Credit risk profile based on payment activity for loans
Total past due	418	648
Current	12,564	15,149
Total financing receivables	12,982	15,797
Recorded Investment greater than 90 days and accruing	0	0
Residential land | 30-59 days past due
Credit risk profile based on payment activity for loans
Total past due	0	23
Residential land | 60-89 days past due
Credit risk profile based on payment activity for loans
Total past due	0	0
Residential land | Greater than 90 days
Credit risk profile based on payment activity for loans
Total past due	418	625
Commercial construction
Credit risk profile based on payment activity for loans
Total past due	0	0
Current	112,838	108,273
Total financing receivables	112,838	108,273
Recorded Investment greater than 90 days and accruing	0	0
Commercial construction | 30-59 days past due
Credit risk profile based on payment activity for loans
Total past due	0	0
Commercial construction | 60-89 days past due
Credit risk profile based on payment activity for loans
Total past due	0	0
Commercial construction | Greater than 90 days
Credit risk profile based on payment activity for loans
Total past due	0	0
Residential construction
Credit risk profile based on payment activity for loans
Total past due	0	0
Current	13,441	14,910
Total financing receivables	13,441	14,910
Recorded Investment greater than 90 days and accruing	0	0
Residential construction | 30-59 days past due
Credit risk profile based on payment activity for loans
Total past due	0	0
Residential construction | 60-89 days past due
Credit risk profile based on payment activity for loans
Total past due	0	0
Residential construction | Greater than 90 days
Credit risk profile based on payment activity for loans
Total past due	0	0
Commercial loans
Credit risk profile based on payment activity for loans
Total past due	1,933	4,580
Current	572,310	540,248
Total financing receivables	574,243	544,828
Recorded Investment greater than 90 days and accruing	0	0
Commercial loans | 30-59 days past due
Credit risk profile based on payment activity for loans
Total past due	1,053	1,825
Commercial loans | 60-89 days past due
Credit risk profile based on payment activity for loans
Total past due	417	2,025
Commercial loans | Greater than 90 days
Credit risk profile based on payment activity for loans
Total past due	463	730
Consumer loans
Credit risk profile based on payment activity for loans
Total past due	8,848	7,467
Current	238,210	216,097
Total financing receivables	247,058	223,564
Recorded Investment greater than 90 days and accruing	0	0
Consumer loans | 30-59 days past due
Credit risk profile based on payment activity for loans
Total past due	4,679	3,432
Consumer loans | 60-89 days past due
Credit risk profile based on payment activity for loans
Total past due	2,200	2,159
Consumer loans | Greater than 90 days
Credit risk profile based on payment activity for loans
Total past due	$ 1,969	$ 1,876

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
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- Definition

Financing receivables that are current.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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-Paragraph 7A
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- Definition

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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
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+ References

No definition available.

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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