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Bank segment - Allowance for loan losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | $ 52,326 | $ 45,795 | $ 50,038 | $ 45,618 |
Charge-offs | (2,505) | (1,814) | (5,463) | (2,961) |
Recoveries | 757 | 559 | 1,237 | 1,269 |
Provision | 4,753 | 1,825 | 9,519 | 2,439 |
Valuation allowance, balance at the end of the period | 55,331 | 46,365 | 55,331 | 46,365 |
Ending balance: individually evaluated for impairment | 6,180 |  | 6,180 |  | $ 6,320
Ending balance: collectively evaluated for impairment | 49,151 |  | 49,151 |  | 43,718
Financing Receivables: |  |  |  |  |
Total financing receivables | 4,760,057 |  | 4,760,057 |  | 4,622,068
Ending balance: individually evaluated for impairment | 59,173 |  | 59,173 |  | 53,685
Ending balance: collectively evaluated for impairment | 4,700,884 |  | 4,700,884 |  | 4,568,383
Residential 1-4 family |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 4,593 | 4,921 | 4,186 | 4,662 |
Charge-offs | (15) | (58) | (60) | (214) |
Recoveries | 35 | 55 | 52 | 67 |
Provision | (229) | (627) | 206 | (224) |
Valuation allowance, balance at the end of the period | 4,384 | 4,291 | 4,384 | 4,291 |
Ending balance: individually evaluated for impairment | 1,709 |  | 1,709 |  | 1,453
Ending balance: collectively evaluated for impairment | 2,675 |  | 2,675 |  | 2,733
Financing Receivables: |  |  |  |  |
Total financing receivables | 2,064,343 |  | 2,064,343 |  | 2,069,665
Ending balance: individually evaluated for impairment | 22,279 |  | 22,279 |  | 22,457
Ending balance: collectively evaluated for impairment | 2,042,064 |  | 2,042,064 |  | 2,047,208
Commercial real estate |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 11,806 | 11,228 | 11,342 | 8,954 |
Provision | 1,755 | (808) | 2,219 | 1,466 |
Valuation allowance, balance at the end of the period | 13,561 | 10,420 | 13,561 | 10,420 |
Ending balance: individually evaluated for impairment | 172 |  | 172 |  | 0
Ending balance: collectively evaluated for impairment | 13,389 |  | 13,389 |  | 11,342
Financing Receivables: |  |  |  |  |
Total financing receivables | 740,322 |  | 740,322 |  | 690,561
Ending balance: individually evaluated for impairment | 3,630 |  | 3,630 |  | 1,188
Ending balance: collectively evaluated for impairment | 736,692 |  | 736,692 |  | 689,373
Home equity line of credit |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 7,172 | 6,523 | 7,260 | 6,982 |
Charge-offs | 0 | (17) | 0 | (20) |
Recoveries | 16 | 8 | 31 | 39 |
Provision | 648 | 99 | 545 | (388) |
Valuation allowance, balance at the end of the period | 7,836 | 6,613 | 7,836 | 6,613 |
Ending balance: individually evaluated for impairment | 826 |  | 826 |  | 442
Ending balance: collectively evaluated for impairment | 7,010 |  | 7,010 |  | 6,818
Financing Receivables: |  |  |  |  |
Total financing receivables | 860,522 |  | 860,522 |  | 846,294
Ending balance: individually evaluated for impairment | 4,646 |  | 4,646 |  | 3,225
Ending balance: collectively evaluated for impairment | 855,876 |  | 855,876 |  | 843,069
Residential land |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 1,740 | 2,286 | 1,671 | 1,875 |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 16 | 136 | 119 | 185 |
Provision | (67) | (319) | (101) | 43 |
Valuation allowance, balance at the end of the period | 1,689 | 2,103 | 1,689 | 2,103 |
Ending balance: individually evaluated for impairment | 819 |  | 819 |  | 891
Ending balance: collectively evaluated for impairment | 870 |  | 870 |  | 780
Financing Receivables: |  |  |  |  |
Total financing receivables | 18,447 |  | 18,447 |  | 18,229
Ending balance: individually evaluated for impairment | 4,453 |  | 4,453 |  | 5,683
Ending balance: collectively evaluated for impairment | 13,994 |  | 13,994 |  | 12,546
Commercial construction |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 6,164 | 2,837 | 4,461 | 5,471 |
Provision | 829 | (262) | 2,532 | (2,896) |
Valuation allowance, balance at the end of the period | 6,993 | 2,575 | 6,993 | 2,575 |
Ending balance: collectively evaluated for impairment | 6,993 |  | 6,993 |  | 4,461
Financing Receivables: |  |  |  |  |
Total financing receivables | 134,642 |  | 134,642 |  | 100,796
Ending balance: collectively evaluated for impairment | 134,642 |  | 134,642 |  | 100,796
Residential construction |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 12 | 21 | 13 | 28 |
Provision | 0 | (3) | (1) | (10) |
Valuation allowance, balance at the end of the period | 12 | 18 | 12 | 18 |
Ending balance: collectively evaluated for impairment | 12 |  | 12 |  | 13
Financing Receivables: |  |  |  |  |
Total financing receivables | 16,004 |  | 16,004 |  | 14,089
Ending balance: collectively evaluated for impairment | 16,004 |  | 16,004 |  | 14,089
Commercial loans |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 16,991 | 14,580 | 17,208 | 14,017 |
Charge-offs | (962) | (756) | (2,305) | (802) |
Recoveries | 425 | 106 | 560 | 447 |
Provision | 631 | 3,539 | 1,622 | 3,807 |
Valuation allowance, balance at the end of the period | 17,085 | 17,469 | 17,085 | 17,469 |
Ending balance: individually evaluated for impairment | 2,647 |  | 2,647 |  | 3,527
Ending balance: collectively evaluated for impairment | 14,438 |  | 14,438 |  | 13,681
Financing Receivables: |  |  |  |  |
Total financing receivables | 772,565 |  | 772,565 |  | 758,659
Ending balance: individually evaluated for impairment | 24,153 |  | 24,153 |  | 21,119
Ending balance: collectively evaluated for impairment | 748,412 |  | 748,412 |  | 737,540
Consumer loans |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 3,848 | 3,399 | 3,897 | 3,629 |
Charge-offs | (1,528) | (983) | (3,098) | (1,925) |
Recoveries | 265 | 254 | 475 | 531 |
Provision | 1,186 | 206 | 2,497 | 641 |
Valuation allowance, balance at the end of the period | 3,771 | 2,876 | 3,771 | 2,876 |
Ending balance: individually evaluated for impairment | 7 |  | 7 |  | 7
Ending balance: collectively evaluated for impairment | 3,764 |  | 3,764 |  | 3,890
Financing Receivables: |  |  |  |  |
Total financing receivables | 153,212 |  | 153,212 |  | 123,775
Ending balance: individually evaluated for impairment | 12 |  | 12 |  | 13
Ending balance: collectively evaluated for impairment | 153,200 |  | 153,200 |  | 123,762
Unallocated |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=66008989&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=66008989&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://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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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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