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Fair Value Measurements - Assets and Liabilities Not Measured and Reported at Fair Value on a Recurring Basis or Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financial assets    
Securities held to maturity $ 976,690 $ 1,002,544
Securities available for sale 2,512,650 831,013
Loans held for sale 286,779 246,171
Mortgage servicing rights 65,466 72,991
Derivative instruments 22,128 34,505
Financial liabilities    
Derivative instruments 18,503 28,550
Carrying Value    
Financial assets    
Cash and cash equivalents 1,083,785 1,092,032
Securities held to maturity 1,051,884 1,126,112
Securities available for sale 2,512,650 831,013
Loans held for sale 286,779 246,171
Loans, net 18,727,930 12,683,264
Mortgage servicing rights 65,466 72,991
Derivative instruments 49,432 38,954
Financial liabilities    
Deposits 21,424,555 14,572,612
Short-term borrowings 606,063 108,018
Junior subordinated debentures 140,355 113,916
Subordinated notes 418,523 316,698
Derivative instruments 44,174 32,268
Fair Value    
Financial assets    
Cash and cash equivalents 1,083,785 1,092,032
Securities held to maturity 976,690 1,002,544
Securities available for sale 2,512,650 831,013
Loans held for sale 286,779 246,171
Loans, net 18,619,999 12,340,638
Mortgage servicing rights 81,796 96,290
Derivative instruments 49,432 38,954
Financial liabilities    
Deposits 21,413,437 14,570,304
Short-term borrowings 606,063 108,018
Junior subordinated debentures 125,831 100,668
Subordinated notes 409,075 295,868
Derivative instruments 44,174 32,268
Fair Value | Level 1    
Financial assets    
Cash and cash equivalents 1,083,785 1,092,032
Securities held to maturity 0 0
Securities available for sale 0 0
Loans held for sale 0 0
Loans, net 0 0
Mortgage servicing rights 0 0
Derivative instruments 0 0
Financial liabilities    
Deposits 0
Short-term borrowings 0 0
Junior subordinated debentures 0 0
Subordinated notes 0 0
Derivative instruments 0 0
Fair Value | Level 2    
Financial assets    
Cash and cash equivalents 0 0
Securities held to maturity 976,690 1,002,544
Securities available for sale 2,512,650 831,013
Loans held for sale 286,779 246,171
Loans, net 0 0
Mortgage servicing rights 0 0
Derivative instruments 49,432 38,954
Financial liabilities    
Deposits 21,413,437 14,570,304
Short-term borrowings 606,063 108,018
Junior subordinated debentures 125,831 100,668
Subordinated notes 409,075 295,868
Derivative instruments 44,174 32,268
Fair Value | Level 3    
Financial assets    
Cash and cash equivalents 0 0
Securities held to maturity 0 0
Securities available for sale 0 0
Loans held for sale 0 0
Loans, net 18,619,999 12,340,638
Mortgage servicing rights 81,796 96,290
Derivative instruments 0 0
Financial liabilities    
Deposits 0 0
Short-term borrowings 0 0
Junior subordinated debentures 0 0
Subordinated notes 0 0
Derivative instruments $ 0 $ 0