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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, 2025	Dec. 31, 2024
Assets
Derivative financial instruments	$ 225,200	$ 160,300
Trading securities	107,519	102,932
Securities available for sale	6,042,800	4,320,593
Liabilities
Derivative financial instruments	560,400	878,000
U.S. Treasuries
Assets
Securities available for sale		10,656
U.S. Government agencies
Assets
Trading securities	16,480	15,002
Securities available for sale		150,418
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Trading securities	5,753	14,803
Securities available for sale	1,550,365	1,377,525
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Trading securities	15,222	14,419
Securities available for sale	675,612	1,040,555
State and municipal obligations
Assets
Trading securities	37,195	35,896
Securities available for sale	961,112	945,723
Small Business Administration loan-backed securities
Assets
Trading securities	27,285	22,571
Securities available for sale	591,560	310,112
Corporate securities
Assets
Securities available for sale	26,977	26,509
Significant Other Observable Inputs (Level 2)
Assets
Mortgage loans held for sale	349,462	281,662
Trading securities	107,519	102,932
Significant Unobservable Inputs (Level 3)
Assets
Mortgage servicing rights	84,491	89,795
SBA servicing asset	5,659	6,028
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	226,359	161,490
Mortgage loans held for sale	68,365	98,115
Trading securities	107,519	102,932
Securities available for sale	6,042,800	4,320,593
Mortgage servicing rights	84,491	89,795
SBA servicing asset	5,659	6,028
Fair value of Assets, Total	6,535,193	4,778,953
Liabilities
Derivative financial instruments	561,708	879,855
Recurring basis | U.S. Treasuries
Assets
Securities available for sale		10,656
Recurring basis | U.S. Government agencies
Assets
Securities available for sale		150,418
Recurring basis | Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Securities available for sale	1,550,365	1,377,525
Recurring basis | Residential Collateralized Mortgage-Obligations Issued By U.S. Government Agencies Or Sponsored Enterprises
Assets
Securities available for sale	2,237,174	459,095
Recurring basis | Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Securities available for sale	675,612	1,040,555
Recurring basis | State and municipal obligations
Assets
Securities available for sale	961,112	945,723
Recurring basis | Small Business Administration loan-backed securities
Assets
Securities available for sale	591,560	310,112
Recurring basis | Corporate securities
Assets
Securities available for sale	26,977	26,509
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets
Derivative financial instruments	226,359	161,490
Mortgage loans held for sale	68,365	98,115
Trading securities	107,519	102,932
Securities available for sale	6,042,800	4,320,593
Fair value of Assets, Total	6,445,043	4,683,130
Liabilities
Derivative financial instruments	561,708	879,855
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Treasuries
Assets
Securities available for sale		10,656
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government agencies
Assets
Securities available for sale		150,418
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	1,550,365	1,377,525
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	2,237,174	459,095
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	675,612	1,040,555
Recurring basis | Significant Other Observable Inputs (Level 2) | State and municipal obligations
Assets
Securities available for sale	961,112	945,723
Recurring basis | Significant Other Observable Inputs (Level 2) | Small Business Administration loan-backed securities
Assets
Securities available for sale	591,560	310,112
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities
Assets
Securities available for sale	26,977	26,509
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets
Mortgage servicing rights	84,491	89,795
SBA servicing asset	5,659	6,028
Fair value of Assets, Total	90,150	$ 95,823
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	89,795
Servicing assets that resulted from transfers of financial assets	5,912
Changes in fair value due to valuation inputs or assumptions	$ (5,182)
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	$ (6,034)
Fair value of assets at the end of the period	84,491
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	6,028
Servicing assets that resulted from transfers of financial assets	1,088
Changes in fair value due to valuation inputs or assumptions	$ 89
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	$ (1,546)
Fair value of assets at the end of the period	$ 5,659

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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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