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Investment Securities - Summary of Unrealized Loss Positions (Details)
Mar. 31, 2023
USD ($)
loan
Dec. 31, 2022
USD ($)
loan
Investments in an unrealized loss position    
Amortized Cost $ 376,189,000 $ 427,128,000
Amount of pretax loss if securities in an unrealized loss position are sold 41,300,000  
Allowance for credit losses, continuous unrealized loss position 0  
Investments in an Unrealized Loss Position    
Less than 12 months, fair value 4,278,000 108,486,000
Less than 12 months, unrealized loss (6,105,000) (10,446,000)
12 months or more, fair value 277,315,000 212,317,000
12 months or more, unrealized loss (35,240,000) (39,353,000)
Asset Pledged as Collateral | Public Funds, Repurchase Agreements, and Potential Borrowings    
Investments in an unrealized loss position    
Amortized Cost 221,300,000 91,300,000
United States government agency securities    
Investments in an unrealized loss position    
Amortized Cost $ 45,266,000 $ 51,436,000
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 26 32
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 513,000 $ 21,287,000
Less than 12 months, unrealized loss (1,000) (1,937,000)
12 months or more, fair value 37,895,000 19,423,000
12 months or more, unrealized loss (5,282,000) (4,700,000)
United States sponsored mortgage-backed securities    
Investments in an unrealized loss position    
Amortized Cost $ 66,976,000 $ 68,267,000
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 47 51
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 0 $ 6,953,000
Less than 12 months, unrealized loss 0 (852,000)
12 months or more, fair value 54,306,000 49,618,000
12 months or more, unrealized loss (10,233,000) (10,844,000)
United States treasury securities    
Investments in an unrealized loss position    
Amortized Cost $ 106,627,000 $ 130,689,000
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 23 29
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 0 $ 11,936,000
Less than 12 months, unrealized loss 0 (130,000)
12 months or more, fair value 99,354,000 102,092,000
12 months or more, unrealized loss $ (7,273,000) $ (9,698,000)
Municipal securities    
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 136 173
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 2,570,000 $ 65,930,000
Less than 12 months, unrealized loss (6,082,000) (7,507,000)
12 months or more, fair value 84,275,000 41,184,000
12 months or more, unrealized loss (12,437,000) (14,111,000)
Corporate debt securities    
Investments in an unrealized loss position    
Amortized Cost $ 11,573,000 $ 10,570,000
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 4 3
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 1,195,000 $ 2,380,000
Less than 12 months, unrealized loss (22,000) (20,000)
12 months or more, fair value 1,485,000 0
12 months or more, unrealized loss $ (15,000) $ 0