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Fair Value - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Assets |  |
Derivative financial instruments | $ 174,000 | $ 169,000
Trading securities | 66,188 | 31,321
Securities available for sale | 4,598,400 | 4,784,388
SBA servicing asset | 6,400 | 6,000
Liabilities |  |
Derivative financial instruments | 954,300,000 | 803,500,000
U.S. Treasuries |  |
Assets |  |
Securities available for sale | 24,587 | 73,890
U.S. Government agencies |  |
Assets |  |
Trading securities | 10,352 | 1,537
Securities available for sale | 223,805 | 224,706
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Assets |  |
Trading securities | 11,383 | 14,461
Securities available for sale | 1,492,423 | 1,558,306
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Assets |  |
Trading securities | 8,467 |
Securities available for sale | 1,012,217 | 1,024,170
State and municipal obligations |  |
Assets |  |
Trading securities | 31,263 | 14,620
Securities available for sale | 960,359 | 977,461
Small Business Administration loan-backed securities |  |
Assets |  |
Securities available for sale | 350,043 | 371,686
Corporate securities. |  |
Assets |  |
Securities available for sale | 26,854 | 26,747
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Loans held for sale | 56,553 | 50,888
Trading securities | 66,188 | 31,321
Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Mortgage servicing rights | 87,970 | 85,164
SBA servicing asset | 6,367 | 5,952
Changes in fair value of assets |  |
Changes in hierarchy classifications of Level 3 assets | 0 |
Changes in hierarchy classifications of Level 3 liabilities | 0 |
Recurring basis |  |
Assets |  |
Derivative financial instruments | 176,784 | 172,939
Loans held for sale | 56,553 | 50,888
Trading securities | 66,188 | 31,321
Securities available for sale | 4,598,400 | 4,784,388
Mortgage servicing rights | 87,970 | 85,164
SBA servicing asset | 6,367 | 5,952
Fair value of Assets, Total | 4,992,262 | 5,130,652
Liabilities |  |
Derivative financial instruments | 954,788 | 804,486
Recurring basis | U.S. Treasuries |  |
Assets |  |
Securities available for sale | 24,587 | 73,890
Recurring basis | U.S. Government agencies |  |
Assets |  |
Securities available for sale | 223,805 | 224,706
Recurring basis | Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Assets |  |
Securities available for sale | 1,492,423 | 1,558,306
Recurring basis | Residential Collateralized Mortgage-Obligations Issued By U.S. Government Agencies Or Sponsored Enterprises |  |
Assets |  |
Securities available for sale | 508,112 | 527,422
Recurring basis | Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Assets |  |
Securities available for sale | 1,012,217 | 1,024,170
Recurring basis | State and municipal obligations |  |
Assets |  |
Securities available for sale | 960,359 | 977,461
Recurring basis | Small Business Administration loan-backed securities |  |
Assets |  |
Securities available for sale | 350,043 | 371,686
Recurring basis | Corporate securities. |  |
Assets |  |
Securities available for sale | 26,854 | 26,747
Recurring basis | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Derivative financial instruments | 176,784 | 172,939
Loans held for sale | 56,553 | 50,888
Trading securities | 66,188 | 31,321
Securities available for sale | 4,598,400 | 4,784,388
Fair value of Assets, Total | 4,897,925 | 5,039,536
Liabilities |  |
Derivative financial instruments | 954,788 | 804,486
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Treasuries |  |
Assets |  |
Securities available for sale | 24,587 | 73,890
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government agencies |  |
Assets |  |
Securities available for sale | 223,805 | 224,706
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 | 1,492,423 | 1,558,306
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential Collateralized Mortgage-Obligations Issued By U.S. Government Agencies Or Sponsored Enterprises |  |
Assets |  |
Securities available for sale | 508,112 | 527,422
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 | 1,012,217 | 1,024,170
Recurring basis | Significant Other Observable Inputs (Level 2) | State and municipal obligations |  |
Assets |  |
Securities available for sale | 960,359 | 977,461
Recurring basis | Significant Other Observable Inputs (Level 2) | Small Business Administration loan-backed securities |  |
Assets |  |
Securities available for sale | 350,043 | 371,686
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities. |  |
Assets |  |
Securities available for sale | 26,854 | 26,747
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Mortgage servicing rights | 87,970 | 85,164
SBA servicing asset | 6,367 | 5,952
Fair value of Assets, Total | $ 94,337 | $ 91,116
Changes in fair value of assets |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenue from Contract with Customer, Excluding Assessed Tax |
Unrealized losses included in accumulated other comprehensive (loss) income related to Level 3 financial assets and liabilities | $ 0 |
Recurring basis | Significant Unobservable Inputs (Level 3) | Mortgage Servicing Rights |  |
Changes in fair value of assets |  |
Fair value of assets at the beginning of the period | 85,164 |
Servicing assets that resulted from transfers of financial assets | 1,864 |
Changes in fair value assets due to valuation inputs or assumptions | 2,384 |
Changes in fair value due to decay | (1,442) |
Fair value of assets at the end of the period | 87,970 |
Recurring basis | Significant Unobservable Inputs (Level 3) | SBA servicing asset |  |
Changes in fair value of assets |  |
Fair value of assets at the beginning of the period | 5,952 |
Servicing assets that resulted from transfers of financial assets | 581 |
Changes in fair value assets due to valuation inputs or assumptions | $ 198 |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenue from Contract with Customer, Excluding Assessed Tax |
Changes in fair value due to decay | $ (364) |
Fair value of assets at the end of the period | $ 6,367 |

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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 excluding accrued interest, 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/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + 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 -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + 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 -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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