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Bank segment - Credit risk profile - payment activity (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Credit risk profile based on payment activity for loans |  |
Total past due | $ 20,756 | $ 23,603
Current | 4,721,924 | 4,647,974
Total financing receivables | 4,742,680 | 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 | 7,078 | 7,237
60-89 days past due |  |
Credit risk profile based on payment activity for loans |  |
Total past due | 4,224 | 6,013
Greater than 90 days |  |
Credit risk profile based on payment activity for loans |  |
Total past due | 9,454 | 10,353
Residential 1-4 family |  |
Credit risk profile based on payment activity for loans |  |
Total past due | 7,169 | 8,318
Current | 2,108,952 | 2,109,729
Total financing receivables | 2,116,121 | 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 | 1,902 | 1,532
Residential 1-4 family | 60-89 days past due |  |
Credit risk profile based on payment activity for loans |  |
Total past due | 662 | 1,715
Residential 1-4 family | Greater than 90 days |  |
Credit risk profile based on payment activity for loans |  |
Total past due | 4,605 | 5,071
Commercial real estate |  |
Credit risk profile based on payment activity for loans |  |
Total past due | 0 | 0
Current | 766,522 | 733,106
Total financing receivables | 766,522 | 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 | 5,414 | 2,590
Current | 909,527 | 910,462
Total financing receivables | 914,941 | 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 | 1,943 | 425
Home equity line of credit | 60-89 days past due |  |
Credit risk profile based on payment activity for loans |  |
Total past due | 1,350 | 114
Home equity line of credit | Greater than 90 days |  |
Credit risk profile based on payment activity for loans |  |
Total past due | 2,121 | 2,051
Residential land |  |
Credit risk profile based on payment activity for loans |  |
Total past due | 640 | 648
Current | 15,929 | 15,149
Total financing receivables | 16,569 | 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 | 640 | 625
Commercial construction |  |
Credit risk profile based on payment activity for loans |  |
Total past due | 0 | 0
Current | 114,535 | 108,273
Total financing receivables | 114,535 | 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 | 15,363 | 14,910
Total financing receivables | 15,363 | 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 | 1,265 | 4,580
Current | 567,106 | 540,248
Total financing receivables | 568,371 | 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 | 344 | 1,825
Commercial loans | 60-89 days past due |  |
Credit risk profile based on payment activity for loans |  |
Total past due | 689 | 2,025
Commercial loans | Greater than 90 days |  |
Credit risk profile based on payment activity for loans |  |
Total past due | 232 | 730
Consumer loans |  |
Credit risk profile based on payment activity for loans |  |
Total past due | 6,268 | 7,467
Current | 223,990 | 216,097
Total financing receivables | 230,258 | 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 | 2,889 | 3,432
Consumer loans | 60-89 days past due |  |
Credit risk profile based on payment activity for loans |  |
Total past due | 1,523 | 2,159
Consumer loans | Greater than 90 days |  |
Credit risk profile based on payment activity for loans |  |
Total past due | $ 1,856 | $ 1,876

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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 + Details
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- Definition Recorded Investment in financing receivables that are past due at 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 7A -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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