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Fair Value - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Assets
Derivative financial instruments	$ 193,900	$ 169,000
Trading securities	87,103	31,321
Securities available for sale	4,564,363	4,784,388
SBA servicing asset	6,100	6,000
Liabilities
Derivative financial instruments	605,900	803,500
U.S. Treasuries
Assets
Securities available for sale	2,685	73,890
U.S. Government agencies
Assets
Trading securities	10,730	1,537
Securities available for sale	175,724	224,706
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Trading securities	15,969	14,461
Securities available for sale	1,486,086	1,558,306
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Trading securities	24,344
Securities available for sale	1,060,829	1,024,170
State and municipal obligations
Assets
Trading securities	26,347	14,620
Securities available for sale	989,303	977,461
Small Business Administration loan-backed securities
Assets
Trading securities	8,552
Securities available for sale	329,510	371,686
Corporate securities
Assets
Securities available for sale	27,984	26,747
Significant Other Observable Inputs (Level 2)
Assets
Mortgage loans held for sale	287,043	50,888
Trading securities	87,103	31,321
Significant Unobservable Inputs (Level 3)
Assets
Mortgage servicing rights	83,512	85,164
SBA servicing asset	6,079	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	195,722	172,939
Mortgage loans held for sale	64,865	50,888
Trading securities	87,103	31,321
Securities available for sale	4,564,363	4,784,388
Mortgage servicing rights	83,512	85,164
SBA servicing asset	6,079	5,952
Fair value of Assets, Total	5,001,644	5,130,652
Liabilities
Derivative financial instruments	606,194	804,486
Recurring basis | U.S. Treasuries
Assets
Securities available for sale	2,685	73,890
Recurring basis | U.S. Government agencies
Assets
Securities available for sale	175,724	224,706
Recurring basis | Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Securities available for sale	1,486,086	1,558,306
Recurring basis | Residential Collateralized Mortgage-Obligations Issued By U.S. Government Agencies Or Sponsored Enterprises
Assets
Securities available for sale	492,242	527,422
Recurring basis | Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Securities available for sale	1,060,829	1,024,170
Recurring basis | State and municipal obligations
Assets
Securities available for sale	989,303	977,461
Recurring basis | Small Business Administration loan-backed securities
Assets
Securities available for sale	329,510	371,686
Recurring basis | Corporate securities
Assets
Securities available for sale	27,984	26,747
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets
Derivative financial instruments	195,722	172,939
Mortgage loans held for sale	64,865	50,888
Trading securities	87,103	31,321
Securities available for sale	4,564,363	4,784,388
Fair value of Assets, Total	4,912,053	5,039,536
Liabilities
Derivative financial instruments	606,194	804,486
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Treasuries
Assets
Securities available for sale	2,685	73,890
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government agencies
Assets
Securities available for sale	175,724	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	1,486,086	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	492,242	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	1,060,829	1,024,170
Recurring basis | Significant Other Observable Inputs (Level 2) | State and municipal obligations
Assets
Securities available for sale	989,303	977,461
Recurring basis | Significant Other Observable Inputs (Level 2) | Small Business Administration loan-backed securities
Assets
Securities available for sale	329,510	371,686
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities
Assets
Securities available for sale	27,984	26,747
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets
Mortgage servicing rights	83,512	85,164
SBA servicing asset	6,079	5,952
Fair value of Assets, Total	89,591	$ 91,116
Changes in fair value of assets
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	7,209
Changes in fair value assets due to valuation inputs or assumptions	$ (2,346)
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	$ (6,515)
Fair value of assets at the end of the period	83,512
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	1,612
Changes in fair value assets due to valuation inputs or assumptions	$ 201
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	$ (1,686)
Fair value of assets at the end of the period	$ 6,079

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Fair value portion of asset recognized for present right to economic benefit.

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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).

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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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.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy.

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Indicates line item in statement of income or comprehensive income that includes gain (loss) from asset measured at fair value using unobservable input (level 3).

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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