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Investment Securities - Summary of Unrealized Loss Positions (Details)
$ in Thousands
Sep. 30, 2022
USD ($)
loan
Dec. 31, 2021
USD ($)
loan
Investments in an unrealized loss position    
Amortized Cost $ 416,217 $ 421,272
Amount of pretax loss if securities in an unrealized loss position are sold 52,400  
Investments in an Unrealized Loss Position    
Less than 12 months, fair value 135,643 203,065
Less than 12 months, unrealized loss (22,453) (3,437)
12 months or more, fair value 187,891 36,616
12 months or more, unrealized loss (29,902) (1,202)
Asset Pledged as Collateral | Public Funds, Repurchase Agreements, and Potential Borrowings    
Investments in an unrealized loss position    
Amortized Cost 27,500 244,600
United States government agency securities    
Investments in an unrealized loss position    
Amortized Cost $ 52,276 $ 41,105
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 31 21
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 22,001 $ 5,101
Less than 12 months, unrealized loss (1,818) (77)
12 months or more, fair value 19,638 21,770
12 months or more, unrealized loss (4,330) (819)
United States sponsored mortgage-backed securities    
Investments in an unrealized loss position    
Amortized Cost $ 69,708 $ 77,519
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 51 30
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 15,078 $ 55,354
Less than 12 months, unrealized loss (2,437) (1,346)
12 months or more, fair value 42,750 7,845
12 months or more, unrealized loss (9,442) (287)
United States treasury securities    
Investments in an unrealized loss position    
Amortized Cost $ 121,479 $ 112,133
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 28 24
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 9,507 $ 110,389
Less than 12 months, unrealized loss (95) (1,744)
12 months or more, fair value 101,525 0
12 months or more, unrealized loss $ (10,352) $ 0
Municipal securities    
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 214 53
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 86,671 $ 32,221
Less than 12 months, unrealized loss (18,089) (270)
12 months or more, fair value 23,978 7,001
12 months or more, unrealized loss (5,778) (96)
Corporate debt securities    
Investments in an unrealized loss position    
Amortized Cost $ 7,654 $ 11,093
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 3  
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 2,386  
Less than 12 months, unrealized loss (14)  
12 months or more, fair value 0  
12 months or more, unrealized loss $ 0