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Bank segment - Credit risk profile - payment activity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Credit risk profile based on payment activity for loans
Total past due	$ 25,581	$ 23,603
Current	4,749,832	4,647,974
Total financing receivables	4,775,413	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	10,933	7,237
60-89 days past due
Credit risk profile based on payment activity for loans
Total past due	4,982	6,013
Greater than 90 days
Credit risk profile based on payment activity for loans
Total past due	9,666	10,353
Residential 1-4 family
Credit risk profile based on payment activity for loans
Total past due	8,683	8,318
Current	2,091,267	2,109,729
Total financing receivables	2,099,950	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	2,975	1,532
Residential 1-4 family | 60-89 days past due
Credit risk profile based on payment activity for loans
Total past due	1,348	1,715
Residential 1-4 family | Greater than 90 days
Credit risk profile based on payment activity for loans
Total past due	4,360	5,071
Commercial real estate
Credit risk profile based on payment activity for loans
Total past due	725	0
Current	758,110	733,106
Total financing receivables	758,835	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	725	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	4,908	2,590
Current	933,994	910,462
Total financing receivables	938,902	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	2,075	425
Home equity line of credit | 60-89 days past due
Credit risk profile based on payment activity for loans
Total past due	288	114
Home equity line of credit | Greater than 90 days
Credit risk profile based on payment activity for loans
Total past due	2,545	2,051
Residential land
Credit risk profile based on payment activity for loans
Total past due	1,483	648
Current	14,549	15,149
Total financing receivables	16,032	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	741	23
Residential land | 60-89 days past due
Credit risk profile based on payment activity for loans
Total past due	111	0
Residential land | Greater than 90 days
Credit risk profile based on payment activity for loans
Total past due	631	625
Commercial construction
Credit risk profile based on payment activity for loans
Total past due	0	0
Current	124,421	108,273
Total financing receivables	124,421	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	14,873	14,910
Total financing receivables	14,873	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	2,763	4,580
Current	590,833	540,248
Total financing receivables	593,596	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	1,721	1,825
Commercial loans | 60-89 days past due
Credit risk profile based on payment activity for loans
Total past due	491	2,025
Commercial loans | Greater than 90 days
Credit risk profile based on payment activity for loans
Total past due	551	730
Consumer loans
Credit risk profile based on payment activity for loans
Total past due	7,019	7,467
Current	221,785	216,097
Total financing receivables	228,804	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	3,421	3,432
Consumer loans | 60-89 days past due
Credit risk profile based on payment activity for loans
Total past due	2,019	2,159
Consumer loans | Greater than 90 days
Credit risk profile based on payment activity for loans
Total past due	$ 1,579	$ 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
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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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- 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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3)
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