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Investment Securities - Summary of Unrealized Loss Positions (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
loan
Dec. 31, 2021
USD ($)
loan
Investments in an unrealized loss position    
Amortized cost $ 427,128 $ 421,272
Amount of pretax loss if securities in an unrealized loss position are sold 49,800  
Investments in an Unrealized Loss Position    
Less than 12 months, fair value 108,486 203,065
Less than 12 months, unrealized loss (10,446) (3,437)
12 months or more, fair value 212,317 36,616
12 months or more, unrealized loss (39,353) (1,202)
Asset Pledged as Collateral | Public Funds, Repurchase Agreements, and Potential Borrowings    
Investments in an unrealized loss position    
Amortized cost 91,300 244,600
United States government agency securities    
Investments in an unrealized loss position    
Amortized cost $ 51,436 $ 41,105
Description and number of positions    
Number of investments in an unrealized loss position, AFS | loan 32 21
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 21,287 $ 5,101
Less than 12 months, unrealized loss (1,937) (77)
12 months or more, fair value 19,423 21,770
12 months or more, unrealized loss (4,700) (819)
United States sponsored mortgage-backed securities    
Investments in an unrealized loss position    
Amortized cost $ 68,267 $ 77,519
Description and number of positions    
Number of investments in an unrealized loss position, AFS | loan 51 30
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 6,953 $ 55,354
Less than 12 months, unrealized loss (852) (1,346)
12 months or more, fair value 49,618 7,845
12 months or more, unrealized loss (10,844) (287)
United States treasury securities    
Investments in an unrealized loss position    
Amortized cost $ 130,689 $ 112,133
Description and number of positions    
Number of investments in an unrealized loss position, AFS | loan 29 24
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 11,936 $ 110,389
Less than 12 months, unrealized loss (130) (1,744)
12 months or more, fair value 102,092 0
12 months or more, unrealized loss $ (9,698) $ 0
Municipal securities    
Description and number of positions    
Number of investments in an unrealized loss position, AFS | loan 173 53
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 65,930 $ 32,221
Less than 12 months, unrealized loss (7,507) (270)
12 months or more, fair value 41,184 7,001
12 months or more, unrealized loss (14,111) (96)
Corporate debt securities    
Investments in an unrealized loss position    
Amortized cost $ 10,570 $ 11,093
Description and number of positions    
Number of investments in an unrealized loss position, AFS | loan 3 9
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 2,380 $ 0
Less than 12 months, unrealized loss (20) 0
12 months or more, fair value 0 0
12 months or more, unrealized loss $ 0 $ 0