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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
Mar. 31, 2021
Dec. 31, 2020
Financial Assets    
Debt securities held to maturity $ 512,307 $ 184,484
Time deposits with other banks 750 750
Loans, net 5,574,849 5,642,616
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 500,720 192,179
Time deposits with other banks 760 762
Loans, net 0 0
Financial Liabilities    
Deposit liabilities 0 0
Subordinated debt 58,285 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 5,608,009 5,686,019
Financial Liabilities    
Deposit liabilities 7,388,104 6,936,097
Subordinated debt 0 0
Carrying Value | Fair Value, Measurements, Recurring    
Financial Assets    
Debt securities held to maturity 512,307 184,484
Time deposits with other banks 750 750
Loans, net 5,651,563 5,633,810
Financial Liabilities    
Deposit liabilities 7,385,749 6,932,561
Subordinated debt $ 71,436 $ 71,365