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Bank segment - Allowance for loan losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | $ 53,895 | $ 55,997 | $ 53,637 | $ 55,533 |
Charge-offs | (4,581) | (3,234) | (9,454) | (7,574) |
Recoveries | 726 | 759 | 2,316 | 1,656 |
Provision | 2,763 | 2,834 | 6,304 | 6,741 |
Valuation allowance, balance at the end of the period | 52,803 | 56,356 | 52,803 | 56,356 |
Ending balance: individually evaluated for impairment | 2,848 |  | 2,848 |  | $ 2,730
Ending balance: collectively evaluated for impairment | 49,955 |  | 49,955 |  | 50,907
Financing Receivables: |  |  |  |  |
Total financing receivables | 4,775,413 |  | 4,775,413 |  | 4,671,577
Ending balance: individually evaluated for impairment | 39,583 |  | 39,583 |  | 33,393
Ending balance: collectively evaluated for impairment | 4,735,830 |  | 4,735,830 |  | 4,638,184
Residential 1-4 family |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 2,525 | 2,781 | 2,902 | 2,873 |
Charge-offs | 0 | 0 | (31) | (6) |
Recoveries | 14 | 49 | 68 | 58 |
Provision | 400 | 300 | 0 | 205 |
Valuation allowance, balance at the end of the period | 2,939 | 3,130 | 2,939 | 3,130 |
Ending balance: individually evaluated for impairment | 1,027 |  | 1,027 |  | 1,248
Ending balance: collectively evaluated for impairment | 1,912 |  | 1,912 |  | 1,654
Financing Receivables: |  |  |  |  |
Total financing receivables | 2,099,950 |  | 2,099,950 |  | 2,118,047
Ending balance: individually evaluated for impairment | 17,605 |  | 17,605 |  | 18,284
Ending balance: collectively evaluated for impairment | 2,082,345 |  | 2,082,345 |  | 2,099,763
Commercial real estate |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 15,959 | 16,504 | 15,796 | 16,004 |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision | (661) | 2,336 | (498) | 2,836 |
Valuation allowance, balance at the end of the period | 15,298 | 18,840 | 15,298 | 18,840 |
Ending balance: individually evaluated for impairment | 53 |  | 53 |  | 65
Ending balance: collectively evaluated for impairment | 15,245 |  | 15,245 |  | 15,731
Financing Receivables: |  |  |  |  |
Total financing receivables | 758,835 |  | 758,835 |  | 733,106
Ending balance: individually evaluated for impairment | 993 |  | 993 |  | 1,016
Ending balance: collectively evaluated for impairment | 757,842 |  | 757,842 |  | 732,090
Home equity line of credit |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 7,982 | 5,417 | 7,522 | 5,039 |
Charge-offs | (144) | 0 | (144) | (14) |
Recoveries | 13 | 39 | 27 | 130 |
Provision | (517) | 71 | (71) | 372 |
Valuation allowance, balance at the end of the period | 7,334 | 5,527 | 7,334 | 5,527 |
Ending balance: individually evaluated for impairment | 1,161 |  | 1,161 |  | 647
Ending balance: collectively evaluated for impairment | 6,173 |  | 6,173 |  | 6,875
Financing Receivables: |  |  |  |  |
Total financing receivables | 938,902 |  | 938,902 |  | 913,052
Ending balance: individually evaluated for impairment | 13,849 |  | 13,849 |  | 8,188
Ending balance: collectively evaluated for impairment | 925,053 |  | 925,053 |  | 904,864
Residential land |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 674 | 1,479 | 896 | 1,738 |
Charge-offs | (9) | (92) | (17) | (92) |
Recoveries | 46 | 15 | 51 | 218 |
Provision | (69) | (138) | (288) | (600) |
Valuation allowance, balance at the end of the period | 642 | 1,264 | 642 | 1,264 |
Ending balance: individually evaluated for impairment | 7 |  | 7 |  | 47
Ending balance: collectively evaluated for impairment | 635 |  | 635 |  | 849
Financing Receivables: |  |  |  |  |
Total financing receivables | 16,032 |  | 16,032 |  | 15,797
Ending balance: individually evaluated for impairment | 1,171 |  | 1,171 |  | 1,265
Ending balance: collectively evaluated for impairment | 14,861 |  | 14,861 |  | 14,532
Commercial construction |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 4,361 | 7,257 | 4,671 | 6,449 |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision | 255 | (2,551) | (55) | (1,743) |
Valuation allowance, balance at the end of the period | 4,616 | 4,706 | 4,616 | 4,706 |
Ending balance: individually evaluated for impairment | 0 |  | 0 |  | 0
Ending balance: collectively evaluated for impairment | 4,616 |  | 4,616 |  | 4,671
Financing Receivables: |  |  |  |  |
Total financing receivables | 124,421 |  | 124,421 |  | 108,273
Ending balance: individually evaluated for impairment | 0 |  | 0 |  | 0
Ending balance: collectively evaluated for impairment | 124,421 |  | 124,421 |  | 108,273
Residential construction |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 4 | 11 | 12 | 12 |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision | 0 | (2) | (8) | (3) |
Valuation allowance, balance at the end of the period | 4 | 9 | 4 | 9 |
Ending balance: individually evaluated for impairment | 0 |  | 0 |  | 0
Ending balance: collectively evaluated for impairment | 4 |  | 4 |  | 12
Financing Receivables: |  |  |  |  |
Total financing receivables | 14,873 |  | 14,873 |  | 14,910
Ending balance: individually evaluated for impairment | 0 |  | 0 |  | 0
Ending balance: collectively evaluated for impairment | 14,873 |  | 14,873 |  | 14,910
Commercial loans |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 10,355 | 14,902 | 10,851 | 16,618 |
Charge-offs | (540) | (752) | (1,142) | (2,262) |
Recoveries | 280 | 299 | 1,450 | 596 |
Provision | 66 | 103 | (998) | (400) |
Valuation allowance, balance at the end of the period | 10,161 | 14,552 | 10,161 | 14,552 |
Ending balance: individually evaluated for impairment | 597 |  | 597 |  | 694
Ending balance: collectively evaluated for impairment | 9,564 |  | 9,564 |  | 10,157
Financing Receivables: |  |  |  |  |
Total financing receivables | 593,596 |  | 593,596 |  | 544,828
Ending balance: individually evaluated for impairment | 5,874 |  | 5,874 |  | 4,574
Ending balance: collectively evaluated for impairment | 587,722 |  | 587,722 |  | 540,254
Consumer loans |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 12,035 | 7,646 | 10,987 | 6,800 |
Charge-offs | (3,888) | (2,390) | (8,120) | (5,200) |
Recoveries | 373 | 357 | 720 | 654 |
Provision | 3,289 | 2,715 | 8,222 | 6,074 |
Valuation allowance, balance at the end of the period | 11,809 | 8,328 | 11,809 | 8,328 |
Ending balance: individually evaluated for impairment | 3 |  | 3 |  | 29
Ending balance: collectively evaluated for impairment | 11,806 |  | 11,806 |  | 10,958
Financing Receivables: |  |  |  |  |
Total financing receivables | 228,804 |  | 228,804 |  | 223,564
Ending balance: individually evaluated for impairment | 91 |  | 91 |  | 66
Ending balance: collectively evaluated for impairment | 228,713 |  | 228,713 |  | 223,498
Unallocated |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 0 | 0 | 0 | 0 |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision | 0 | 0 | 0 | 0 |
Valuation allowance, balance at the end of the period | 0 | $ 0 | 0 | $ 0 |
Ending balance: collectively evaluated for impairment | $ 0 |  | $ 0 |  | $ 0

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + 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://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 + Details
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