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Fair Value - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Assets |  |
Derivative financial instruments | $ 516,600 | $ 802,800
Securities available for sale | 4,369,159 | 3,330,672
Liabilities |  |
Derivative financial instruments | 516,600 | 802,700
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Assets |  |
Securities available for sale | 1,666,127 | 1,367,132
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Assets |  |
Securities available for sale | 812,613 | 240,108
State and municipal obligations |  |
Assets |  |
Securities available for sale | 693,128 | 520,039
Corporate securities. |  |
Assets |  |
Securities available for sale | 13,892 | 13,702
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Loans held for sale | 171,447 | 290,467
Trading securities | 89,925 | 10,674
Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Mortgage servicing rights | 57,351 | 43,820
Changes in fair value of assets |  |
Fair value of assets at the beginning of the period | 43,820 |
Servicing assets that resulted from transfers of financial assets | 15,496 |
Changes in fair value assets due to valuation inputs or assumptions | 3,243 |
Changes in fair value due to decay | (5,208) |
Fair value of assets at the end of the period | 57,351 |
Changes in hierarchy classifications of Level 3 liabilities | 0 |
Recurring basis |  |
Assets |  |
Derivative financial instruments | 526,145 | 813,899
Loans held for sale | 171,447 | 290,467
Trading securities | 89,925 | 10,674
Securities available for sale | 4,369,159 | 3,330,672
Mortgage servicing rights | 57,351 | 43,820
Fair value of Assets, Total | 5,214,027 | 4,489,532
Liabilities |  |
Derivative financial instruments | 518,221 | 804,832
Recurring basis | Government-sponsored entities debt |  |
Assets |  |
Securities available for sale | 48,137 | 29,256
Recurring basis | Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Assets |  |
Securities available for sale | 1,666,127 | 1,367,132
Recurring basis | Residential Collateralized Mortgage-Obligations Issued By U.S. Government Agencies Or Sponsored Enterprises [Member] |  |
Assets |  |
Securities available for sale | 666,777 | 755,551
Recurring basis | Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Assets |  |
Securities available for sale | 812,613 | 240,108
Recurring basis | State and municipal obligations |  |
Assets |  |
Securities available for sale | 693,128 | 520,039
Recurring basis | Mortgage-backed securities |  |
Assets |  |
Securities available for sale | 468,485 | 404,884
Recurring basis | Corporate securities. |  |
Assets |  |
Securities available for sale | 13,892 | 13,702
Recurring basis | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Derivative financial instruments | 526,145 | 813,899
Loans held for sale | 171,447 | 290,467
Trading securities | 89,925 | 10,674
Securities available for sale | 4,369,159 | 3,330,672
Fair value of Assets, Total | 5,156,676 | 4,445,712
Liabilities |  |
Derivative financial instruments | 518,221 | 804,832
Recurring basis | Significant Other Observable Inputs (Level 2) | Government-sponsored entities debt |  |
Assets |  |
Securities available for sale | 48,137 | 29,256
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Assets |  |
Securities available for sale | 1,666,127 | 1,367,132
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential Collateralized Mortgage-Obligations Issued By U.S. Government Agencies Or Sponsored Enterprises [Member] |  |
Assets |  |
Securities available for sale | 666,777 | 755,551
Recurring basis | Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Assets |  |
Securities available for sale | 812,613 | 240,108
Recurring basis | Significant Other Observable Inputs (Level 2) | State and municipal obligations |  |
Assets |  |
Securities available for sale | 693,128 | 520,039
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities |  |
Assets |  |
Securities available for sale | 468,485 | 404,884
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities. |  |
Assets |  |
Securities available for sale | 13,892 | 13,702
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Mortgage servicing rights | 57,351 | 43,820
Fair value of Assets, Total | 57,351 | $ 43,820
Changes in fair value of assets |  |
Unrealized losses included in accumulated other comprehensive income related to Level 3 financial assets and liabilities | $ 0 |

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- Definition The element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, the element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. The item represents residential mortgage servicing rights as presented on the statement of financial position which are due to the entity as of the balance sheet date. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=117815213&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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