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Subordinated Notes (Details) - USD ($)
Dec. 13, 2017
Aug. 06, 2015
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Subordinated notes     $ 98,883,000 $ 98,705,000
Subordinated notes – due 2027        
Debt Instrument [Line Items]        
Subordinated notes     $ 69,133,000 $ 69,009,000
Subordinated notes, interest rate     4.25% 4.25%
Subordinated notes – due 2025        
Debt Instrument [Line Items]        
Subordinated notes     $ 29,750,000 $ 29,696,000
Subordinated notes, interest rate     3.29% 4.75%
Subordinated Debt | Subordinated notes – due 2027        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 70,000,000.0      
Subordinated notes, interest rate 4.25%      
Subordinated Debt | Subordinated notes – due 2027 | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Subordinated notes, basis spread on variable rate 2.05%      
Subordinated Debt | Subordinated notes – due 2025        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 30,000,000.0    
Subordinated notes, interest rate   4.75%    
Subordinated Debt | Subordinated notes – due 2025 | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Subordinated notes, basis spread on variable rate   3.068%