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Derivative Financial Instruments - Interest Rate Swaps Not Designated as Hedges (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Not designated as hedging      
Derivative Financial Instruments      
Notional Amount, Derivative Asset $ 394,954 $ 290,418  
Notional Amount, Derivative Liability 394,954 290,418  
Fair values of derivative assets and liabilities recorded in consolidated balance sheets      
Fair value recorded in other assets 32,685 12,354  
Fair value recorded in other liabilities 32,685 12,354  
Interest rate swap      
Derivative Financial Instruments      
Variable rate, commercial loans that are supported by the interest rate swap contracts 395,000 290,400  
Gains and losses on these derivative assets and liabilities recorded in non-interest expense in the unaudited Consolidated Statements of Income      
Cash pledged to secure obligations 36,000 18,100  
Interest rate swap | Not designated as hedging      
Derivative Financial Instruments      
Notional Amount, Derivative Asset 394,954 290,418  
Notional Amount, Derivative Liability 394,954 290,418  
Fair values of derivative assets and liabilities recorded in consolidated balance sheets      
Fair value recorded in other assets 32,685 12,354  
Fair value recorded in other liabilities 32,685 12,354  
Non-interest expense | Interest rate swap      
Gains and losses on these derivative assets and liabilities recorded in non-interest expense in the unaudited Consolidated Statements of Income      
Gain (loss) pay, floating receive fixed 20,331 10,915 $ 1,176
Gain (loss) pay fixed receive floating $ 20,331 $ 10,915 $ 1,176