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Investment Securities - Summary of Unrealized Loss Positions (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Investments in an unrealized loss position    
Carrying value of securities pledged $ 280,000 $ 229,400
Amount of pretax loss if securities in an unrealized loss position are sold 2,300  
Investments in an Unrealized Loss Position    
Less than 12 months, fair value 184,687 50,155
Less than 12 months, unrealized loss (1,687) (376)
12 months or more, fair value 26,919 15,923
12 months or more, unrealized loss $ (609) $ (158)
United States government agency securities    
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 20 27
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 4,334 $ 19,021
Less than 12 months, unrealized loss (138) (68)
12 months or more, fair value 18,113 12,574
12 months or more, unrealized loss $ (459) $ (142)
United States sponsored mortgage-backed securities    
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 27 9
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 57,861 $ 15,331
Less than 12 months, unrealized loss (803) (155)
12 months or more, fair value 4,431 3,349
12 months or more, unrealized loss $ (81) $ (16)
United States treasury securities    
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 18  
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 82,423  
Less than 12 months, unrealized loss (316)  
12 months or more, fair value 0  
12 months or more, unrealized loss $ 0  
Municipal securities    
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 56 14
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 40,069 $ 11,856
Less than 12 months, unrealized loss (430) (82)
12 months or more, fair value 2,898 0
12 months or more, unrealized loss $ (46) $ 0
Other securities    
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 1 5
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 0 $ 3,947
Less than 12 months, unrealized loss 0 (71)
12 months or more, fair value 1,477 0
12 months or more, unrealized loss $ (23) $ 0