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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
Jun. 30, 2021
Dec. 31, 2020
Financial Assets    
Debt securities held to maturity $ 493,467 $ 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 489,289 192,179
Time deposits with other banks 759 762
Loans, net 0 0
Financial Liabilities    
Deposit liabilities 0 0
Subordinated debt 58,342 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 5,367,748 5,686,019
Financial Liabilities    
Deposit liabilities 7,838,507 6,936,097
Subordinated debt 0 0
Carrying Value | Fair Value, Measurements, Recurring    
Financial Assets    
Debt securities held to maturity 493,467 184,484
Time deposits with other banks 750 750
Loans, net 5,345,710 5,633,810
Financial Liabilities    
Deposit liabilities 7,836,436 6,932,561
Subordinated debt $ 71,506 $ 71,365