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Fair value measurements - Fair Value Measurements on a Recurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | $ 1,401,198 | $ 1,105,182
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Weighted average discount rate | 3.048% |
Mortgage-related securities-FNMA, FHLMC and GNMA |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | $ 1,201,473 | 897,474
U.S. Treasury and federal agency obligations |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 184,298 | 192,281
Mortgage revenue bond |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 15,427 | 15,427
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, January 1 | 15,427 | 0
Principal payments received | 0 | 0
Purchases | 0 | 15,427
Unrealized gain (loss) included in other comprehensive income | 0 | 0
Balance, December 31 | 15,427 | 15,427
Fair value measurements on a recurring basis | Level 1 |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative assets | 0 | 0
Derivative liabilities | 20 | 129
Fair value measurements on a recurring basis | Level 1 | Other |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Money market funds | 0 | 0
Fair value measurements on a recurring basis | Level 1 | Bank |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 0 | 0
Fair value measurements on a recurring basis | Level 1 | Bank | Interest Rate Lock Commitments |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Level 1 | Bank | Forward commitments |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative assets | 0 | 0
Derivative liabilities | 20 | 129
Fair value measurements on a recurring basis | Level 1 | Bank | Mortgage-related securities-FNMA, FHLMC and GNMA |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 0 | 0
Fair value measurements on a recurring basis | Level 1 | Bank | U.S. Treasury and federal agency obligations |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 0 | 0
Fair value measurements on a recurring basis | Level 1 | Bank | Mortgage revenue bond |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 0 | 0
Fair value measurements on a recurring basis | Level 1 | Electric utility | Foreign Exchange Forward |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Level 2 |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative assets | 393 | 453
Derivative liabilities | 10 | 823
Fair value measurements on a recurring basis | Level 2 | Other |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Money market funds | 0 | 13,085
Fair value measurements on a recurring basis | Level 2 | Bank |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 1,385,771 | 1,089,755
Fair value measurements on a recurring basis | Level 2 | Bank | Interest Rate Lock Commitments |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative assets | 133 | 445
Derivative liabilities | 2 | 24
Fair value measurements on a recurring basis | Level 2 | Bank | Forward commitments |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative assets | 4 | 8
Derivative liabilities | 8 | 56
Fair value measurements on a recurring basis | Level 2 | Bank | Mortgage-related securities-FNMA, FHLMC and GNMA |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 1,201,473 | 897,474
Fair value measurements on a recurring basis | Level 2 | Bank | U.S. Treasury and federal agency obligations |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 184,298 | 192,281
Fair value measurements on a recurring basis | Level 2 | Bank | Mortgage revenue bond |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 0 | 0
Fair value measurements on a recurring basis | Level 2 | Electric utility | Foreign Exchange Forward |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative assets | 256 | 0
Derivative liabilities | 0 | 743
Fair value measurements on a recurring basis | Level 3 |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Level 3 | Other |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Money market funds | 0 | 0
Fair value measurements on a recurring basis | Level 3 | Bank |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 15,427 | 15,427
Fair value measurements on a recurring basis | Level 3 | Bank | Interest Rate Lock Commitments |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Level 3 | Bank | Forward commitments |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Level 3 | Bank | Mortgage-related securities-FNMA, FHLMC and GNMA |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 0 | 0
Fair value measurements on a recurring basis | Level 3 | Bank | U.S. Treasury and federal agency obligations |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 0 | 0
Fair value measurements on a recurring basis | Level 3 | Bank | Mortgage revenue bond |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 15,427 | 15,427
Fair value measurements on a recurring basis | Level 3 | Electric utility | Foreign Exchange Forward |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative assets | 0 | 0
Derivative liabilities | $ 0 | $ 0

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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