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Investments - Textual (Details)
6 Months Ended
Jun. 30, 2021
USD ($)
security
Loans
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Available-for-sale Securities      
Available-for-sale Securities pledged as collateral $ 191,882,000    
Unrealized gain (loss) of available-for sale securities 18,278,000   $ 21,091,000
AOCI available-for-sale securities adjustment tax $ 5,404,000,000   6,235,000
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to realized net gains on available-for-sale securities   $ 1,224,000  
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 $ 75,000    
Other than temporary impairment losses on investment securities 0    
Debt securities, amortized cost $ 934,138,000    
Available-for-sale Securities, Number of Securities, Loss Position | Loans 5    
U.S. Government agencies      
Schedule of Available-for-sale Securities      
Available-for-sale securities, number of positions | security 1    
Debt securities, amortized cost $ 637,000   651,000
Obligations of states and political subdivisions      
Schedule of Available-for-sale Securities      
Available-for-sale securities, number of positions | security 122    
Debt securities, amortized cost $ 458,250,000   361,734,000
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 16    
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 115    
Debt securities, amortized cost $ 224,920,000   214,203,000
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 8    
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 11    
Private label mortgage and asset backed securities      
Schedule of Available-for-sale Securities      
Available-for-sale securities, number of positions | security 49    
Debt securities, amortized cost $ 180,844,000   82,413,000
Private label 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 18    
Private label 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 2    
Corporate debt securities      
Schedule of Available-for-sale Securities      
Available-for-sale securities, number of positions | security 14    
Debt securities, amortized cost $ 49,500,000   $ 30,000,000
U.S. Treasury securities      
Schedule of Available-for-sale Securities      
Available-for-sale securities, number of positions | security 2    
Available-for-sale securities in unrealized loss positions, number of positions | security 1    
Debt securities, amortized cost $ 19,987,000