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Fair Value - Assets and liabilities measured at fair value on a recurring basis (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Assets    
Derivative financial instruments $ 182,400 $ 169,000
Trading securities 92,161 31,321
Securities available for sale 4,498,264 4,784,388
SBA servicing asset 6,300 6,000
Liabilities    
Derivative financial instruments 955,300 803,500
U.S. Treasuries    
Assets    
Trading securities 20,500  
Securities available for sale 37,945 73,890
U.S. Government agencies    
Assets    
Trading securities 10,220 1,537
Securities available for sale 195,123 224,706
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Assets    
Trading securities 28,838 14,461
Securities available for sale 1,448,928 1,558,306
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Assets    
Trading securities 2,782  
Securities available for sale 1,008,962 1,024,170
State and municipal obligations    
Assets    
Trading securities 26,134 14,620
Securities available for sale 952,702 977,461
Small Business Administration loan-backed securities    
Assets    
Securities available for sale 336,742 371,686
Corporate securities    
Assets    
Securities available for sale 27,318 26,747
Significant Other Observable Inputs (Level 2)    
Assets    
Loans held for sale 100,007 50,888
Trading securities 92,161 31,321
Significant Unobservable Inputs (Level 3)    
Assets    
Mortgage servicing rights 88,904 85,164
SBA servicing asset 6,307 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 185,036 172,939
Loans held for sale 100,007 50,888
Trading securities 92,161 31,321
Securities available for sale 4,498,264 4,784,388
Mortgage servicing rights 88,904 85,164
SBA servicing asset 6,307 5,952
Fair value of Assets, Total 4,970,679 5,130,652
Liabilities    
Derivative financial instruments 955,347 804,486
Recurring basis | U.S. Treasuries    
Assets    
Securities available for sale 37,945 73,890
Recurring basis | U.S. Government agencies    
Assets    
Securities available for sale 195,123 224,706
Recurring basis | Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Assets    
Securities available for sale 1,448,928 1,558,306
Recurring basis | Residential Collateralized Mortgage-Obligations Issued By U.S. Government Agencies Or Sponsored Enterprises    
Assets    
Securities available for sale 490,544 527,422
Recurring basis | Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises    
Assets    
Securities available for sale 1,008,962 1,024,170
Recurring basis | State and municipal obligations    
Assets    
Securities available for sale 952,702 977,461
Recurring basis | Small Business Administration loan-backed securities    
Assets    
Securities available for sale 336,742 371,686
Recurring basis | Corporate securities    
Assets    
Securities available for sale 27,318 26,747
Recurring basis | Significant Other Observable Inputs (Level 2)    
Assets    
Derivative financial instruments 185,036 172,939
Loans held for sale 100,007 50,888
Trading securities 92,161 31,321
Securities available for sale 4,498,264 4,784,388
Fair value of Assets, Total 4,875,468 5,039,536
Liabilities    
Derivative financial instruments 955,347 804,486
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Treasuries    
Assets    
Securities available for sale 37,945 73,890
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government agencies    
Assets    
Securities available for sale 195,123 224,706
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 1,448,928 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 490,544 527,422
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 1,008,962 1,024,170
Recurring basis | Significant Other Observable Inputs (Level 2) | State and municipal obligations    
Assets    
Securities available for sale 952,702 977,461
Recurring basis | Significant Other Observable Inputs (Level 2) | Small Business Administration loan-backed securities    
Assets    
Securities available for sale 336,742 371,686
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities    
Assets    
Securities available for sale 27,318 26,747
Recurring basis | Significant Unobservable Inputs (Level 3)    
Assets    
Mortgage servicing rights 88,904 85,164
SBA servicing asset 6,307 5,952
Fair value of Assets, Total 95,211 $ 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 4,533  
Changes in fair value assets due to valuation inputs or assumptions $ 3,214  
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 $ (4,007)  
Fair value of assets at the end of the period 88,904  
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 1,113  
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 $ (956)  
Fair value of assets at the end of the period $ 6,307