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Fair Value Measurements - Carrying Amounts and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financial assets      
Securities held to maturity $ 1,121,830 $ 1,206,540  
Securities available for sale 923,279 1,533,942  
Loans held for sale 179,756 110,105  
Mortgage servicing rights 91,688 84,448 $ 89,018
Derivative instruments 29,284 36,493  
Financial liabilities      
Derivative instruments 26,425 22,056  
Carrying Value      
Financial assets      
Cash and cash equivalents 801,351 575,992  
Securities held to maturity 1,221,464 1,324,040  
Securities available for sale 923,279 1,533,942  
Loans held for sale 179,756 110,105  
Loans, net 12,152,652 11,386,214  
Mortgage servicing rights 91,688 84,448  
Derivative instruments 37,151 38,047  
Financial liabilities      
Deposits 14,076,785 13,486,966  
Short-term borrowings 307,577 712,232  
Junior subordinated debentures 112,978 112,042  
Subordinated notes 316,422 316,091  
Derivative instruments 33,608 33,185  
Fair Value      
Financial assets      
Cash and cash equivalents 801,351 575,992  
Securities held to maturity 1,121,830 1,206,540  
Securities available for sale 923,279 1,533,942  
Loans held for sale 179,756 110,105  
Loans, net 11,594,363 10,850,181  
Mortgage servicing rights 117,664 122,454  
Derivative instruments 37,151 38,047  
Financial liabilities      
Deposits 14,060,050 13,445,417  
Short-term borrowings 307,577 712,232  
Junior subordinated debentures 96,435 98,574  
Subordinated notes 255,192 277,500  
Derivative instruments 33,608 33,185  
Fair Value | Level 1      
Financial assets      
Cash and cash equivalents 801,351 575,992  
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 11,381,556 11,791,526  
Short-term borrowings 307,577 712,232  
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 1,121,830 1,206,540  
Securities available for sale 923,279 1,533,942  
Loans held for sale 179,756 110,105  
Loans, net 0 0  
Mortgage servicing rights 0 0  
Derivative instruments 37,151 38,047  
Financial liabilities      
Deposits 2,678,494 1,653,891  
Short-term borrowings 0 0  
Junior subordinated debentures 96,435 98,574  
Subordinated notes 255,192 277,500  
Derivative instruments 33,608 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 11,594,363 10,850,181  
Mortgage servicing rights 117,664 122,454  
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