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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, 2023
Dec. 31, 2022
Financial assets    
Securities held to maturity $ 1,079,123 $ 1,206,540
Securities available for sale 909,108 1,533,942
Loans held for sale 241,613 110,105
Mortgage servicing rights 90,241 84,448
Derivative instruments 45,807 36,493
Financial liabilities    
Derivative instruments 28,081 22,056
Carrying Value    
Financial assets    
Cash and cash equivalents 741,156 575,992
Securities held to maturity 1,245,595 1,324,040
Securities available for sale 909,108 1,533,942
Loans held for sale 241,613 110,105
Loans, net 11,970,250 11,386,214
Mortgage servicing rights 90,241 84,448
Derivative instruments 47,719 38,047
Financial liabilities    
Deposits 14,157,110 13,486,966
Short-term borrowings 107,662 712,232
Junior subordinated debentures 112,744 112,042
Subordinated notes 314,655 316,091
Derivative instruments 43,469 33,185
Fair Value    
Financial assets    
Cash and cash equivalents 741,156 575,992
Securities held to maturity 1,079,123 1,206,540
Securities available for sale 909,108 1,533,942
Loans held for sale 241,613 110,105
Loans, net 11,178,841 10,850,181
Mortgage servicing rights 127,719 122,454
Derivative instruments 47,719 38,047
Financial liabilities    
Deposits 14,130,268 13,445,417
Short-term borrowings 107,662 712,232
Junior subordinated debentures 94,410 98,754
Subordinated notes 249,900 277,500
Derivative instruments 43,469 33,185
Fair Value | Level 1    
Financial assets    
Cash and cash equivalents 741,156 575,992
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 11,284,243 11,791,526
Short-term borrowings 107,662 712,232
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 1,079,123 1,206,540
Securities available for sale 909,108 1,533,942
Loans held for sale 241,613 110,105
Loans, net 0 0
Mortgage servicing rights 0 0
Derivative instruments 47,719 38,047
Financial liabilities    
Deposits 2,846,025 1,653,891
Short-term borrowings 0 0
Junior subordinated debentures 94,410 98,754
Subordinated notes 249,900 277,500
Derivative instruments 43,469 33,185
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 11,178,841 10,850,181
Mortgage servicing rights 127,719 122,454
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