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Portfolio loans - Distribution (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Portfolio Loans |  |  |  |
Portfolio loans | $ 6,515,081 | $ 5,568,428 |  |
Allowance for loan losses | (50,915) | (50,648) | $ (52,649) | $ (53,582)
Portfolio loans, net | 6,464,166 | 5,517,780 |  |
Net deferred loan origination costs | 5,400 | 5,600 |  |
Amount of loan reduction due to net accretable purchase accounting adjustments | 28,200 | 13,900 |  |
Commercial |  |  |  |
Portfolio Loans |  |  |  |
Portfolio loans | 1,657,022 | 1,405,106 |  |
Allowance for loan losses | (17,998) | (17,829) | (17,577) | (14,779)
Commercial real estate |  |  |  |
Portfolio Loans |  |  |  |
Portfolio loans | 2,699,491 | 2,366,823 |  |
Allowance for loan losses | (20,097) | (21,137) | (22,090) | (21,813)
Real estate construction |  |  |  |
Portfolio Loans |  |  |  |
Portfolio loans | 387,623 | 288,197 |  |
Allowance for loan losses | (2,807) | (2,723) | (2,799) | (2,861)
Retail real estate |  |  |  |
Portfolio Loans |  |  |  |
Portfolio loans | 1,718,415 | 1,480,133 |  |
Allowance for loan losses | (9,503) | (8,471) | (9,836) | (13,783)
Retail other |  |  |  |
Portfolio Loans |  |  |  |
Portfolio loans | 52,530 | 28,169 |  |
Allowance for loan losses | $ (510) | $ (488) | $ (347) | $ (346)

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + 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=84173941&loc=SL6953423-111524 Reference 2: 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=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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