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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, 2026	Dec. 31, 2025
Assets
Derivative financial instruments	$ 189,300	$ 221,700
Trading securities	117,590	110,183
Securities available for sale	6,530,348	6,313,756
Liabilities
Derivative financial instruments	560,300	554,400
U.S. Government agencies
Assets
Trading securities	14,504	1,872
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Trading securities	5,787	9,799
Securities available for sale	1,849,098	1,698,108
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Trading securities	27,728	5,966
Securities available for sale	970,311	832,449
State and municipal obligations
Assets
Trading securities	26,573	24,816
Securities available for sale	1,041,195	1,007,412
Small Business Administration loan-backed securities
Assets
Trading securities	34,887	66,173
Securities available for sale	543,485	568,433
Corporate securities
Assets
Securities available for sale	21,704	21,770
Significant Other Observable Inputs (Level 2)
Assets
Mortgage loans held for sale	330,177	348,381
Trading securities	117,590	110,183
Significant Unobservable Inputs (Level 3)
Assets
Mortgage servicing rights	90,018	84,032
SBA servicing asset	5,176	5,512
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	191,332	222,886
Mortgage loans held for sale	48,094	61,400
Trading securities	117,590	110,183
Securities available for sale	6,530,348	6,313,756
Mortgage servicing rights	90,018	84,032
SBA servicing asset	5,176	5,512
Fair value of Assets, Total	6,982,558	6,797,769
Liabilities
Derivative financial instruments	562,406	554,748
Recurring basis | Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Securities available for sale	1,849,098	1,698,108
Recurring basis | Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises
Assets
Securities available for sale	2,104,555	2,185,584
Recurring basis | Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
Assets
Securities available for sale	970,311	832,449
Recurring basis | State and municipal obligations
Assets
Securities available for sale	1,041,195	1,007,412
Recurring basis | Small Business Administration loan-backed securities
Assets
Securities available for sale	543,485	568,433
Recurring basis | Corporate securities
Assets
Securities available for sale	21,704	21,770
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets
Derivative financial instruments	191,332	222,886
Mortgage loans held for sale	48,094	61,400
Trading securities	117,590	110,183
Securities available for sale	6,530,348	6,313,756
Fair value of Assets, Total	6,887,364	6,708,225
Liabilities
Derivative financial instruments	562,406	554,748
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	1,849,098	1,698,108
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	2,104,555	2,185,584
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	970,311	832,449
Recurring basis | Significant Other Observable Inputs (Level 2) | State and municipal obligations
Assets
Securities available for sale	1,041,195	1,007,412
Recurring basis | Significant Other Observable Inputs (Level 2) | Small Business Administration loan-backed securities
Assets
Securities available for sale	543,485	568,433
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities
Assets
Securities available for sale	21,704	21,770
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets
Mortgage servicing rights	90,018	84,032
SBA servicing asset	5,176	5,512
Fair value of Assets, Total	95,194	$ 89,544
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	84,032
Servicing assets that resulted from transfers of financial assets	1,627
Changes in fair value due to valuation inputs or assumptions	$ 6,564
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	$ (2,205)
Fair value of assets at the end of the period	90,018
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	5,512
Servicing assets that resulted from transfers of financial assets	156
Changes in fair value due to valuation inputs or assumptions	$ 10
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	$ (502)
Fair value of assets at the end of the period	$ 5,176

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

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

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-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483467/210-10-45-1

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