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Fair Value Measurement - Summary of Financial Assets and Liabilities Measured at Fair Value on 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, at fair value $ 1,427,605   $ 1,447,230      
Equity and other securities, at fair value 10,299   8,764      
Servicing assets, at fair value 23,597 $ 24,683 22,042 $ 21,267 $ 18,351 $ 19,471
Derivative assets 13,463   17,149      
Derivative liabilities 12,348   18,133      
U.S. Treasury Notes            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 8,578   23,812      
U.S. Government Agencies            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 123,264   113,551      
Obligations of States, Municipalities, and Political Subdivisions            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 105,060   142,419      
Corporate Securities            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 66,827   60,768      
Asset-Backed Securities            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 37,285   45,156      
Fair Value, Measurements, Recurring            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Servicing assets, at fair value 23,597   22,042      
Derivative assets 13,463   17,149      
Derivative liabilities 12,348   18,133      
Fair Value, Measurements, Recurring | U.S. Treasury Notes            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 8,578   23,812      
Fair Value, Measurements, Recurring | U.S. Government Agencies            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 123,264   113,551      
Fair Value, Measurements, Recurring | Obligations of States, Municipalities, and Political Subdivisions            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 105,060   142,419      
Fair Value, Measurements, Recurring | Mortgage-Backed Securities; Residential | Agency            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 785,173   778,391      
Fair Value, Measurements, Recurring | Mortgage-Backed Securities; Residential | Non-Agency            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 64,009   32,981      
Fair Value, Measurements, Recurring | Mortgage-Backed Securities; Commercial | Agency            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 237,409   250,152      
Fair Value, Measurements, Recurring | Corporate Securities            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 66,827   60,768      
Fair Value, Measurements, Recurring | Asset-Backed Securities            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 37,285   45,156      
Fair Value, Measurements, Recurring | Mutual Funds            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Equity and other securities, at fair value 4,424   2,983      
Fair Value, Measurements, Recurring | Equity Securities            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Equity and other securities, at fair value 5,875   5,781      
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury Notes            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 8,578   23,812      
Fair Value, Measurements, Recurring | Level 1 | Mutual Funds            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Equity and other securities, at fair value 4,424   2,983      
Fair Value, Measurements, Recurring | Level 2            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Derivative assets 13,463   17,149      
Derivative liabilities 12,348   18,133      
Fair Value, Measurements, Recurring | Level 2 | U.S. Government Agencies            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 123,264   113,551      
Fair Value, Measurements, Recurring | Level 2 | Obligations of States, Municipalities, and Political Subdivisions            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 105,060   142,419      
Fair Value, Measurements, Recurring | Level 2 | Mortgage-Backed Securities; Residential | Agency            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 785,173   778,391      
Fair Value, Measurements, Recurring | Level 2 | Mortgage-Backed Securities; Residential | Non-Agency            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 64,009   32,981      
Fair Value, Measurements, Recurring | Level 2 | Mortgage-Backed Securities; Commercial | Agency            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 237,409   250,152      
Fair Value, Measurements, Recurring | Level 2 | Corporate Securities            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 66,827   60,768      
Fair Value, Measurements, Recurring | Level 2 | Asset-Backed Securities            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Securities available-for-sale, at fair value 37,285   45,156      
Fair Value, Measurements, Recurring | Level 2 | Equity Securities            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Equity and other securities, at fair value 5,189   5,096      
Fair Value, Measurements, Recurring | Level 3            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Servicing assets, at fair value 23,597   22,042      
Fair Value, Measurements, Recurring | Level 3 | Equity Securities            
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]            
Equity and other securities, at fair value $ 686   $ 685