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Fair value measurements - Fair Value Measurements on a Recurring Basis (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | $ 1,388,533 | $ 1,401,198
Discount rate |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Mortgage revenue bonds, measurement input | 0.0396 |
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | $ 1,161,416 | 1,201,473
U.S. Treasury and federal agency obligations |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 154,349 | 184,298
Mortgage revenue bonds |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 23,636 | 15,427
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance, January 1 | 15,427 | 15,427
Principal payments received | 0 | 0
Purchases | 8,209 | 0
Unrealized gain (loss) included in other comprehensive income | 0 | 0
Balance, December 31 | 23,636 | 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 | 34 | 20
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 | 34 | 20
Fair value measurements on a recurring basis | Level 1 | Bank | Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies |  |
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 | Corporate bonds |  |
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 bonds |  |
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 | Window forward contracts |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative assets | 0 | 0
Fair value measurements on a recurring basis | Level 1 | Other | Interest rate swap |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Level 2 |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative assets | 91 | 393
Derivative liabilities | 596 | 10
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 | 1,364,897 | 1,385,771
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 | 91 | 133
Derivative liabilities | 0 | 2
Fair value measurements on a recurring basis | Level 2 | Bank | Forward commitments |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative assets | 0 | 4
Derivative liabilities | 9 | 8
Fair value measurements on a recurring basis | Level 2 | Bank | Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 1,161,416 | 1,201,473
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 | 154,349 | 184,298
Fair value measurements on a recurring basis | Level 2 | Bank | Corporate bonds |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 49,132 | 0
Fair value measurements on a recurring basis | Level 2 | Bank | Mortgage revenue bonds |  |
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 | Window forward contracts |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative assets | 0 | 256
Fair value measurements on a recurring basis | Level 2 | Other | Interest rate swap |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative liabilities | 587 | 0
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 | Bank |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 23,636 | 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-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies |  |
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 | Corporate bonds |  |
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 bonds |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Available-for-sale, at fair value | 23,636 | 15,427
Fair value measurements on a recurring basis | Level 3 | Electric utility | Window forward contracts |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative assets | 0 | 0
Fair value measurements on a recurring basis | Level 3 | Other | Interest rate swap |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Derivative liabilities | $ 0 | $ 0

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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