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Investment Securities - Textual (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Schedule of Available-for-sale Securities      
Unrealized gain (loss) on available for sale portfolio $ 21,091,000 $ 3,999,000  
Tax liabilities (benefits) associated with available-for-sale portfolio 6,235,000 1,182,000  
Remaining unaccreted balance of HTM securities   0  
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to 1,257,000 $ 1,537,000 $ 388,000
Threshold Period of Value Decline in Available-for-sale Securities to be considered Other than Temporary Impairment   12 months  
Threshold Percentage of Value Decline in Available-for-sale Securities to be considered Other than Temporary Impairment   10.00%  
Threshold Amount of Value Decline in Available-for-sale Securities to be considered Other than Temporary Impairment   $ 10,000  
Other than temporary impairment losses on investment securities 0    
Debt securities, amortized cost 689,001,000 466,747,000  
Available-for-sale investment securities, Amortized cost 689,001,000 466,747,000  
Securities pledged as collateral $ 185,053,000 91,677,000  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security 1    
Securities Pledged as Collateral      
Schedule of Available-for-sale Securities      
Available-for-sale investment securities, Amortized cost $ 178,561,000 89,158,000  
U.S. Government agencies      
Schedule of Available-for-sale Securities      
Available-for-sale Securities, Number of Positions | security 1    
Debt securities, amortized cost $ 651,000 14,740,000  
Obligations of states and political subdivisions      
Schedule of Available-for-sale Securities      
Available-for-sale Securities, Number of Positions | security 106    
Debt securities, amortized cost $ 361,734,000 89,574,000  
Obligations of states and political subdivisions | Less than 12 months      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 6    
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations      
Schedule of Available-for-sale Securities      
Available-for-sale Securities, Number of Positions | security 113    
Debt securities, amortized cost $ 214,203,000 198,125,000  
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations | Less than 12 months      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 9    
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations | Greater than 12 months      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 16    
Private label residential mortgage and asset backed securities      
Schedule of Available-for-sale Securities      
Unrealized gain (loss) on available for sale portfolio $ 1,095,000    
Available-for-sale Securities, Number of Positions | security 31    
Debt securities, amortized cost $ 82,413,000 155,308,000  
Private label residential mortgage and asset backed securities | External Credit Rating, Non Investment Grade [Member]      
Schedule of Available-for-sale Securities      
Available-for-sale Securities, Number of Positions | security 7    
Debt securities, amortized cost $ 812,000    
Private label residential mortgage and asset backed securities | Less than 12 months      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 6    
Private label residential mortgage and asset backed securities | Greater than 12 months      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 0    
Corporate Debt Securities [Member]      
Schedule of Available-for-sale Securities      
Available-for-sale Securities, Number of Positions | security 9    
Debt securities, amortized cost $ 30,000,000 $ 9,000,000  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | security 3