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Investment Securities - Summary of Unrealized Loss Positions (Details)
$ in Thousands
Jun. 30, 2022
USD ($)
loan
Dec. 31, 2021
USD ($)
loan
Investments in an unrealized loss position    
Amortized Cost $ 411,774 $ 421,272
Amount of pretax loss if securities in an unrealized loss position are sold 40,400  
Investments in an Unrealized Loss Position    
Less than 12 months, fair value 244,998 203,065
Less than 12 months, unrealized loss (29,793) (3,437)
12 months or more, fair value 67,474 36,616
12 months or more, unrealized loss (10,646) (1,202)
Asset Pledged as Collateral | Public Funds, Repurchase Agreements, and Potential Borrowings    
Investments in an unrealized loss position    
Amortized Cost 159,400 244,600
United States government agency securities    
Investments in an unrealized loss position    
Amortized Cost $ 53,885 $ 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 $ 27,421 $ 5,101
Less than 12 months, unrealized loss (1,585) (77)
12 months or more, fair value 17,376 21,770
12 months or more, unrealized loss (2,647) (819)
United States sponsored mortgage-backed securities    
Investments in an unrealized loss position    
Amortized Cost $ 72,074 $ 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 $ 21,091 $ 55,354
Less than 12 months, unrealized loss (2,402) (1,346)
12 months or more, fair value 41,978 7,845
12 months or more, unrealized loss (6,604) (287)
United States treasury securities    
Investments in an unrealized loss position    
Amortized Cost $ 111,963 $ 112,133
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 24 24
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 104,280 $ 110,389
Less than 12 months, unrealized loss (7,683) (1,744)
12 months or more, fair value 0 0
12 months or more, unrealized loss $ 0 $ 0
Municipal securities    
Description and Number of Positions    
Number of investments in an unrealized loss position | loan 150 53
Investments in an Unrealized Loss Position    
Less than 12 months, fair value $ 90,708 $ 32,221
Less than 12 months, unrealized loss (18,121) (270)
12 months or more, fair value 8,120 7,001
12 months or more, unrealized loss (1,395) (96)
Corporate debt securities    
Investments in an unrealized loss position    
Amortized Cost $ 6,794 $ 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 $ 1,498  
Less than 12 months, unrealized loss (2)  
12 months or more, fair value 0  
12 months or more, unrealized loss $ 0