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Fair Value of Financial Instruments - Fair Value of Assets and Liabilities Recorded on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale $ 1,486,543   $ 1,004,674      
Securities carried at fair value through income 10,876   11,554      
Loans held for sale 63,001   136,026      
Loans at fair value 0   17,011      
Mortgage servicing rights 16,000 $ 16,081 13,660 $ 14,322 $ 15,235 $ 20,697
State and municipal securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 408,733   442,185      
Securities carried at fair value through income 10,876   11,554      
Corporate bonds            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 78,827   65,938      
Commercial mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 39,438   11,080      
Residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 555,351   214,951      
Commercial collateralized mortgage obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 10,437          
Residential collateralized mortgage obligations            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 210,431   195,343      
Asset-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 84,825   74,328      
Fair Value, Measurements, Recurring            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 1,486,543   1,004,674      
Securities carried at fair value through income 10,876   11,554      
Loans held for sale 63,001   136,026      
Loans at fair value     17,011      
Mortgage servicing rights 16,000   13,660      
Other assets - derivatives 14,881   23,694      
Total recurring fair value measurements - assets 1,591,301   1,206,619      
Other liabilities - derivatives (14,679)   (23,020)      
Total recurring fair value measurements - liabilities (14,679)   (23,020)      
Fair Value, Measurements, Recurring | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 93,047   0      
Securities carried at fair value through income 0   0      
Loans held for sale 0   0      
Loans at fair value     0      
Mortgage servicing rights 0   0      
Other assets - derivatives 0   0      
Total recurring fair value measurements - assets 93,047   0      
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 1,351,397   960,609      
Securities carried at fair value through income 0   0      
Loans held for sale 63,001   136,026      
Loans at fair value     0      
Mortgage servicing rights 0   0      
Other assets - derivatives 14,881   23,694      
Total recurring fair value measurements - assets 1,429,279   1,120,329      
Other liabilities - derivatives (14,679)   (23,020)      
Total recurring fair value measurements - liabilities (14,679)   (23,020)      
Fair Value, Measurements, Recurring | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 42,099   44,065      
Securities carried at fair value through income 10,876   11,554      
Loans held for sale 0   0      
Loans at fair value     17,011      
Mortgage servicing rights 16,000   13,660      
Other assets - derivatives 0   0      
Total recurring fair value measurements - assets 68,975   86,290      
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 408,733   442,185      
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 366,634   398,120      
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 42,099   44,065      
Fair Value, Measurements, Recurring | Corporate bonds            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Securities available for sale 78,827   65,938      
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 78,827   65,938      
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 93,047          
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 93,047          
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          
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          
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 5,454   849      
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 5,454   849      
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 39,438   11,080      
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 39,438   11,080      
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 555,351   214,951      
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 555,351   214,951      
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 10,437          
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          
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 10,437          
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          
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 210,431   195,343      
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 210,431   195,343      
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 84,825   74,328      
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 84,825   74,328      
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