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Investment Securities - Summary of Unrealized Loss Positions (Details)
Jun. 30, 2023
USD ($)
loan
Dec. 31, 2022
USD ($)
loan
Investments in an unrealized loss position    
Amount of pretax loss if securities in an unrealized loss position are sold $ 45,900,000  
Allowance for credit losses, continuous unrealized loss position 0  
Investments in an Unrealized Loss Position    
Less than 12 months, fair value 7,953,000 $ 108,486,000
Less than 12 months, unrealized loss (6,974,000) (10,446,000)
12 months or more, fair value 273,767,000 212,317,000
12 months or more, unrealized loss (38,962,000) (39,353,000)
Asset Pledged as Collateral | Public Funds, Repurchase Agreements, and Potential Borrowings    
Investments in an unrealized loss position    
Amortized cost $ 212,000,000 $ 91,300,000
United States government agency securities    
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 25 32
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 272,000 $ 21,287,000
Less than 12 months, unrealized loss 0 (1,937,000)
12 months or more, fair value 36,479,000 19,423,000
12 months or more, unrealized loss $ (6,376,000) $ (4,700,000)
United States sponsored mortgage-backed securities    
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 48 51
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 2,362,000 $ 6,953,000
Less than 12 months, unrealized loss (22,000) (852,000)
12 months or more, fair value 52,004,000 49,618,000
12 months or more, unrealized loss $ (11,327,000) $ (10,844,000)
United States treasury securities    
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 98,028,000 102,092,000
12 months or more, unrealized loss $ (8,523,000) $ (9,698,000)
Municipal securities    
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 155 173
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 2,890,000 $ 65,930,000
Less than 12 months, unrealized loss (6,810,000) (7,507,000)
12 months or more, fair value 85,784,000 41,184,000
12 months or more, unrealized loss $ (12,708,000) $ (14,111,000)
Corporate debt securities    
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 7 3
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 2,429,000 $ 2,380,000
Less than 12 months, unrealized loss (142,000) (20,000)
12 months or more, fair value 1,472,000 0
12 months or more, unrealized loss $ (28,000) $ 0