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Fair Value - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Assets |  |
Derivative financial instruments | $ 169,000 | $ 209,800
Trading securities | 31,321 | 31,263
Securities available for sale | 4,784,388 | 5,326,822
SBA servicing asset | 6,000 | 6,100
Liabilities |  |
Derivative financial instruments | $ 803,500 | $ 1,000
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 | Revenue from Contract with Customer, Excluding Assessed Tax
U.S. Treasuries |  |
Assets |  |
Securities available for sale | $ 73,890 | $ 265,638
U.S. Government agencies |  |
Assets |  |
Trading securities | 1,537 | 11,190
Securities available for sale | 224,706 | 219,088
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Assets |  |
Trading securities | 14,461 |
Securities available for sale | 1,558,306 | 1,698,353
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Assets |  |
Trading securities |  | 4,589
Securities available for sale | 1,024,170 | 1,000,398
State and municipal obligations |  |
Assets |  |
Trading securities | 14,620 | 13,993
Securities available for sale | 977,461 | 1,064,852
Small Business Administration loan-backed securities |  |
Assets |  |
Securities available for sale | 371,686 | 444,810
Corporate securities. |  |
Assets |  |
Securities available for sale | 26,747 | 32,638
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Loans held for sale | 50,888 | 28,968
Trading securities | 31,321 | 31,263
Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Mortgage servicing rights | 85,164 | 86,610
SBA servicing asset | 5,952 | 6,068
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 | 172,939 | 211,016
Loans held for sale | 50,888 | 28,968
Trading securities | 31,321 | 31,263
Securities available for sale | 4,784,388 | 5,326,822
Mortgage servicing rights | 85,164 | 86,610
SBA servicing asset | 5,952 | 6,068
Fair value of Assets, Total | 5,130,652 | 5,690,747
Liabilities |  |
Derivative financial instruments | 804,486 | 1,034,143
Recurring basis | U.S. Treasuries |  |
Assets |  |
Securities available for sale | 73,890 | 265,638
Recurring basis | U.S. Government agencies |  |
Assets |  |
Securities available for sale | 224,706 | 219,088
Recurring basis | Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Assets |  |
Securities available for sale | 1,558,306 | 1,698,353
Recurring basis | Residential Collateralized Mortgage-Obligations Issued By U.S. Government Agencies Or Sponsored Enterprises |  |
Assets |  |
Securities available for sale | 527,422 | 601,045
Recurring basis | Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Assets |  |
Securities available for sale | 1,024,170 | 1,000,398
Recurring basis | State and municipal obligations |  |
Assets |  |
Securities available for sale | 977,461 | 1,064,852
Recurring basis | Small Business Administration loan-backed securities |  |
Assets |  |
Securities available for sale |  | 444,810
Recurring basis | Mortgage-backed securities |  |
Assets |  |
Securities available for sale | 371,686 |
Recurring basis | Corporate securities. |  |
Assets |  |
Securities available for sale | 26,747 | 32,638
Recurring basis | Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Derivative financial instruments | 172,939 | 211,016
Loans held for sale | 50,888 | 28,968
Trading securities | 31,321 | 31,263
Securities available for sale | 4,784,388 | 5,326,822
Fair value of Assets, Total | 5,039,536 | 5,598,069
Liabilities |  |
Derivative financial instruments | 804,486 | 1,034,143
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Treasuries |  |
Assets |  |
Securities available for sale | 73,890 | 265,638
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government agencies |  |
Assets |  |
Securities available for sale | 224,706 | 219,088
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Assets |  |
Securities available for sale | 1,558,306 | 1,698,353
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 | 527,422 | 601,045
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 | 1,024,170 | 1,000,398
Recurring basis | Significant Other Observable Inputs (Level 2) | State and municipal obligations |  |
Assets |  |
Securities available for sale | 977,461 | 1,064,852
Recurring basis | Significant Other Observable Inputs (Level 2) | Small Business Administration loan-backed securities |  |
Assets |  |
Securities available for sale |  | 444,810
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities |  |
Assets |  |
Securities available for sale | 371,686 |
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities. |  |
Assets |  |
Securities available for sale | 26,747 | 32,638
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Mortgage servicing rights | 85,164 | 86,610
SBA servicing asset | 5,952 | 6,068
Fair value of Assets, Total | $ 91,116 | $ 92,678
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 | 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 | $ 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 | 86,610 | 65,620
Servicing assets that resulted from transfers of financial assets | 8,444 | 16,002
Changes in fair value assets due to valuation inputs or assumptions | (1,350) | 14,886
Changes in fair value due to decay | (8,540) | (9,898)
Fair value of assets at the end of the period | 85,164 | 86,610
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 | 6,068 | 7,369
Servicing assets that resulted from transfers of financial assets | 1,621 | 1,273
Changes in fair value assets due to valuation inputs or assumptions | 507 | (729)
Changes in fair value due to decay | (2,244) | (1,845)
Fair value of assets at the end of the period | $ 5,952 | $ 6,068

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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 Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + 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 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 -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -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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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Indicates line item in statement in which net income is reported that includes gain (loss) from asset measured at fair value 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 Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + 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 net income (trading). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483467/210-10-45-1 + Details
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