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Fair Value of Financial Instruments - Fair Value of Assets and Liabilities Recorded on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale $ 1,804,370   $ 1,504,728      
Securities carried at fair value through income 6,630   7,497      
Loans held for sale 31,840   37,032      
Mortgage servicing rights 22,127 $ 21,187 16,220 $ 16,081 $ 17,552 $ 13,660
State and municipal securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 401,944   405,818      
Securities carried at fair value through income 6,630   7,497      
Corporate bonds            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 79,593   82,734      
Commercial mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 110,697   64,243      
Residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 649,126   557,801      
Commercial collateralized mortgage obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 40,965   19,672      
Residential collateralized mortgage obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 188,591   193,740      
Asset-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 76,407   83,062      
Fair Value, Measurements, Recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 1,804,370   1,504,728      
Securities carried at fair value through income 6,630   7,497      
Loans held for sale 31,840   37,032      
Mortgage servicing rights 22,127   16,220      
Other assets - derivatives 17,328   11,459      
Total recurring fair value measurements - assets 1,882,295   1,576,936      
Other liabilities - derivatives (15,824)   (11,494)      
Total recurring fair value measurements - liabilities (15,824)   (11,494)      
Fair Value, Measurements, Recurring | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 115,642   92,245      
Securities carried at fair value through income 0   0      
Loans held for sale 0   0      
Mortgage servicing rights 0   0      
Other assets - derivatives 0   0      
Total recurring fair value measurements - assets 115,642   92,245      
Other liabilities - derivatives 0   0      
Total recurring fair value measurements - liabilities 0   0      
Fair Value, Measurements, Recurring | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 1,631,163   1,371,022      
Securities carried at fair value through income 0   0      
Loans held for sale 31,840   37,032      
Mortgage servicing rights 0   0      
Other assets - derivatives 17,328   11,459      
Total recurring fair value measurements - assets 1,680,331   1,419,513      
Other liabilities - derivatives (15,824)   (11,494)      
Total recurring fair value measurements - liabilities (15,824)   (11,494)      
Fair Value, Measurements, Recurring | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 57,565   41,461      
Securities carried at fair value through income 6,630   7,497      
Loans held for sale 0   0      
Mortgage servicing rights 22,127   16,220      
Other assets - derivatives 0   0      
Total recurring fair value measurements - assets 86,322   65,178      
Other liabilities - derivatives 0   0      
Total recurring fair value measurements - liabilities 0   0      
Fair Value, Measurements, Recurring | State and municipal securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 401,944   405,818      
Fair Value, Measurements, Recurring | State and municipal securities | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 0   0      
Fair Value, Measurements, Recurring | State and municipal securities | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 344,379   364,357      
Fair Value, Measurements, Recurring | State and municipal securities | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 57,565   41,461      
Fair Value, Measurements, Recurring | Corporate bonds            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 79,593   82,734      
Fair Value, Measurements, Recurring | Corporate bonds | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 0   0      
Fair Value, Measurements, Recurring | Corporate bonds | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 79,593   82,734      
Fair Value, Measurements, Recurring | Corporate bonds | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 0   0      
Fair Value, Measurements, Recurring | U.S. treasury securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 115,642   92,245      
Fair Value, Measurements, Recurring | U.S. treasury securities | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 115,642   92,245      
Fair Value, Measurements, Recurring | U.S. treasury securities | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 0   0      
Fair Value, Measurements, Recurring | U.S. treasury securities | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 0   0      
Fair Value, Measurements, Recurring | U.S. government agency securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 141,405   5,413      
Fair Value, Measurements, Recurring | U.S. government agency securities | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 0   0      
Fair Value, Measurements, Recurring | U.S. government agency securities | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 141,405   5,413      
Fair Value, Measurements, Recurring | U.S. government agency securities | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 0   0      
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 110,697   64,243      
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 0   0      
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 110,697   64,243      
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 0   0      
Fair Value, Measurements, Recurring | Residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 649,126   557,801      
Fair Value, Measurements, Recurring | Residential mortgage-backed securities | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 0   0      
Fair Value, Measurements, Recurring | Residential mortgage-backed securities | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 649,126   557,801      
Fair Value, Measurements, Recurring | Residential mortgage-backed securities | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 0   0      
Fair Value, Measurements, Recurring | Commercial collateralized mortgage obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 40,965   19,672      
Fair Value, Measurements, Recurring | Commercial collateralized mortgage obligations | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 0   0      
Fair Value, Measurements, Recurring | Commercial collateralized mortgage obligations | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 40,965   19,672      
Fair Value, Measurements, Recurring | Commercial collateralized mortgage obligations | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 0   0      
Fair Value, Measurements, Recurring | Residential collateralized mortgage obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 188,591   193,740      
Fair Value, Measurements, Recurring | Residential collateralized mortgage obligations | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 0   0      
Fair Value, Measurements, Recurring | Residential collateralized mortgage obligations | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 188,591   193,740      
Fair Value, Measurements, Recurring | Residential collateralized mortgage obligations | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 0   0      
Fair Value, Measurements, Recurring | Asset-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 76,407   83,062      
Fair Value, Measurements, Recurring | Asset-backed securities | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 0   0      
Fair Value, Measurements, Recurring | Asset-backed securities | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 76,407   83,062      
Fair Value, Measurements, Recurring | Asset-backed securities | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale $ 0   $ 0