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Bank segment - Allowance for loan losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | $ 55,997 | $ 52,326 | $ 55,533 | $ 50,038 |
Charge-offs | (3,234) | (2,505) | (7,574) | (5,463) |
Recoveries | 759 | 757 | 1,656 | 1,237 |
Provision | 2,834 | 4,753 | 6,741 | 9,519 |
Valuation allowance, balance at the end of the period | 56,356 | 55,331 | 56,356 | 55,331 |
Ending balance: individually evaluated for impairment | 3,129 |  | 3,129 |  | $ 4,083
Ending balance: collectively evaluated for impairment | 53,227 |  | 53,227 |  | 51,450
Financing Receivables: |  |  |  |  |
Total financing receivables | 4,747,756 |  | 4,747,756 |  | 4,743,619
Ending balance: individually evaluated for impairment | 34,101 |  | 34,101 |  | 51,759
Ending balance: collectively evaluated for impairment | 4,713,655 |  | 4,713,655 |  | 4,691,860
Residential 1-4 family |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 2,781 | 4,593 | 2,873 | 4,186 |
Charge-offs | 0 | (15) | (6) | (60) |
Recoveries | 49 | 35 | 58 | 52 |
Provision | 300 | (229) | 205 | 206 |
Valuation allowance, balance at the end of the period | 3,130 | 4,384 | 3,130 | 4,384 |
Ending balance: individually evaluated for impairment | 1,332 |  | 1,332 |  | 1,352
Ending balance: collectively evaluated for impairment | 1,798 |  | 1,798 |  | 1,521
Financing Receivables: |  |  |  |  |
Total financing receivables | 2,061,549 |  | 2,061,549 |  | 2,048,051
Ending balance: individually evaluated for impairment | 19,188 |  | 19,188 |  | 19,854
Ending balance: collectively evaluated for impairment | 2,042,361 |  | 2,042,361 |  | 2,028,197
Commercial real estate |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 16,504 | 11,806 | 16,004 | 11,342 |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision | 2,336 | 1,755 | 2,836 | 2,219 |
Valuation allowance, balance at the end of the period | 18,840 | 13,561 | 18,840 | 13,561 |
Ending balance: individually evaluated for impairment | 73 |  | 73 |  | 80
Ending balance: collectively evaluated for impairment | 18,767 |  | 18,767 |  | 15,924
Financing Receivables: |  |  |  |  |
Total financing receivables | 808,900 |  | 808,900 |  | 800,395
Ending balance: individually evaluated for impairment | 1,289 |  | 1,289 |  | 1,569
Ending balance: collectively evaluated for impairment | 807,611 |  | 807,611 |  | 798,826
Home equity line of credit |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 5,417 | 7,172 | 5,039 | 7,260 |
Charge-offs | 0 | 0 | (14) | 0 |
Recoveries | 39 | 16 | 130 | 31 |
Provision | 71 | 648 | 372 | 545 |
Valuation allowance, balance at the end of the period | 5,527 | 7,836 | 5,527 | 7,836 |
Ending balance: individually evaluated for impairment | 275 |  | 275 |  | 215
Ending balance: collectively evaluated for impairment | 5,252 |  | 5,252 |  | 4,824
Financing Receivables: |  |  |  |  |
Total financing receivables | 883,135 |  | 883,135 |  | 863,163
Ending balance: individually evaluated for impairment | 6,684 |  | 6,684 |  | 6,158
Ending balance: collectively evaluated for impairment | 876,451 |  | 876,451 |  | 857,005
Residential land |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 1,479 | 1,740 | 1,738 | 1,671 |
Charge-offs | (92) | 0 | (92) | 0 |
Recoveries | 15 | 16 | 218 | 119 |
Provision | (138) | (67) | (600) | (101) |
Valuation allowance, balance at the end of the period | 1,264 | 1,689 | 1,264 | 1,689 |
Ending balance: individually evaluated for impairment | 480 |  | 480 |  | 789
Ending balance: collectively evaluated for impairment | 784 |  | 784 |  | 949
Financing Receivables: |  |  |  |  |
Total financing receivables | 16,009 |  | 16,009 |  | 18,889
Ending balance: individually evaluated for impairment | 2,589 |  | 2,589 |  | 3,629
Ending balance: collectively evaluated for impairment | 13,420 |  | 13,420 |  | 15,260
Commercial construction |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 7,257 | 6,164 | 6,449 | 4,461 |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision | (2,551) | 829 | (1,743) | 2,532 |
Valuation allowance, balance at the end of the period | 4,706 | 6,993 | 4,706 | 6,993 |
Ending balance: individually evaluated for impairment | 0 |  | 0 |  | 0
Ending balance: collectively evaluated for impairment | 4,706 |  | 4,706 |  | 6,449
Financing Receivables: |  |  |  |  |
Total financing receivables | 116,548 |  | 116,548 |  | 126,768
Ending balance: individually evaluated for impairment | 0 |  | 0 |  | 0
Ending balance: collectively evaluated for impairment | 116,548 |  | 116,548 |  | 126,768
Residential construction |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 11 | 12 | 12 | 13 |
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision | (2) | 0 | (3) | (1) |
Valuation allowance, balance at the end of the period | 9 | 12 | 9 | 12 |
Ending balance: individually evaluated for impairment | 0 |  | 0 |  | 0
Ending balance: collectively evaluated for impairment | 9 |  | 9 |  | 12
Financing Receivables: |  |  |  |  |
Total financing receivables | 10,759 |  | 10,759 |  | 16,080
Ending balance: individually evaluated for impairment | 0 |  | 0 |  | 0
Ending balance: collectively evaluated for impairment | 10,759 |  | 10,759 |  | 16,080
Commercial loans |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 14,902 | 16,991 | 16,618 | 17,208 |
Charge-offs | (752) | (962) | (2,262) | (2,305) |
Recoveries | 299 | 425 | 596 | 560 |
Provision | 103 | 631 | (400) | 1,622 |
Valuation allowance, balance at the end of the period | 14,552 | 17,085 | 14,552 | 17,085 |
Ending balance: individually evaluated for impairment | 939 |  | 939 |  | 1,641
Ending balance: collectively evaluated for impairment | 13,613 |  | 13,613 |  | 14,977
Financing Receivables: |  |  |  |  |
Total financing receivables | 649,657 |  | 649,657 |  | 692,051
Ending balance: individually evaluated for impairment | 4,283 |  | 4,283 |  | 20,539
Ending balance: collectively evaluated for impairment | 645,374 |  | 645,374 |  | 671,512
Consumer loans |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Valuation allowance, balance at the beginning of the period | 7,646 | 3,848 | 6,800 | 3,897 |
Charge-offs | (2,390) | (1,528) | (5,200) | (3,098) |
Recoveries | 357 | 265 | 654 | 475 |
Provision | 2,715 | 1,186 | 6,074 | 2,497 |
Valuation allowance, balance at the end of the period | 8,328 | 3,771 | 8,328 | 3,771 |
Ending balance: individually evaluated for impairment | 30 |  | 30 |  | 6
Ending balance: collectively evaluated for impairment | 8,298 |  | 8,298 |  | 6,794
Financing Receivables: |  |  |  |  |
Total financing receivables | 201,199 |  | 201,199 |  | 178,222
Ending balance: individually evaluated for impairment | 68 |  | 68 |  | 10
Ending balance: collectively evaluated for impairment | 201,131 |  | 201,131 |  | 178,212
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

X
- 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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