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Fair Value - Carrying Amount and Fair Value of Other Significant Financial Instruments Not Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financial Assets    
Debt securities held-to-maturity $ 526,502 $ 184,484
Time deposits with other banks 750 750
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Assets    
Debt securities held-to-maturity 0 0
Time deposits with other banks 0 0
Loans, net 0 0
Financial Liabilities    
Deposit liabilities 0 0
Subordinated debt 0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Financial Assets    
Debt securities held-to-maturity 518,464 192,179
Time deposits with other banks 757 762
Loans, net 0 0
Financial Liabilities    
Deposit liabilities 0 0
Subordinated debt 58,399 58,227
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Financial Assets    
Debt securities held-to-maturity 0 0
Time deposits with other banks 0 0
Loans, net 5,810,038 5,686,019
Financial Liabilities    
Deposit liabilities 8,336,134 6,936,097
Subordinated debt 0 0
Carrying Value | Fair Value, Measurements, Recurring    
Financial Assets    
Debt securities held-to-maturity 526,502 184,484
Time deposits with other banks 750 750
Loans, net 5,808,116 5,633,810
Financial Liabilities    
Deposit liabilities 8,334,172 6,932,561
Subordinated debt $ 71,576 $ 71,365