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Subsequent Events (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Oct. 19, 2021
$ / shares
Oct. 01, 2021
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2020
$ / shares
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2020
$ / shares
Nov. 05, 2021
office
Nov. 01, 2021
USD ($)
Jul. 01, 2021
USD ($)
Dec. 31, 2020
USD ($)
Subsequent Event [Line Items]                    
Cash dividends declared (in dollars per share) | $ / shares     $ 0.33 $ 0.25 $ 0.96 $ 0.75        
Unrealized loss on securities transferred from available-for-sale to held-to-maturity     $ 2,225   $ 2,225         $ 0
Municipal bonds                    
Subsequent Event [Line Items]                    
Securities transferred from available-for-sale to held-to-maturity     157,600              
Unrealized loss on securities transferred from available-for-sale to held-to-maturity     $ 2,225   $ 2,225       $ 3,200  
Subsequent Event                    
Subsequent Event [Line Items]                    
Cash dividends declared (in dollars per share) | $ / shares $ 0.33                  
Number of bank branch offices consolidated | office             2      
Number of bank branch offices operated | office             61      
Subsequent Event | Interest rate swaps contracts | Fair Value Hedging | Designated as Hedging Instrument                    
Subsequent Event [Line Items]                    
Notional amount of derivatives               $ 300,000    
Subsequent Event | Municipal bonds                    
Subsequent Event [Line Items]                    
Securities transferred from available-for-sale to held-to-maturity   $ 165,500                
Unrealized loss on securities transferred from available-for-sale to held-to-maturity   3,400                
Realized gain (loss) on securities transferred from available-for-sale to held-to-maturity   $ 0