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Investment Securities - Allowance for Credit Losses HTM (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]        
Beginning balance $ 1,377 $ 1,618 $ 1,279 $ 2,915
Provision for credit loss expense 0 (486) 0 (1,183)
Net increase (decrease) in allowance on previously impaired securities 0   0 (600)
Recoveries 4   102  
Ending balance 1,381 1,132 1,381 1,132
State and political subdivisions        
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]        
Beginning balance 1,285 1,042 1,197 2,307
Provision for credit loss expense 0 (171) 0 (1,436)
Net increase (decrease) in allowance on previously impaired securities (1,183)   (1,183) 0
Recoveries 1   89  
Ending balance 103 871 103 871
Other securities        
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]        
Beginning balance 92 576 82 608
Provision for credit loss expense 0 (315) 0 253
Net increase (decrease) in allowance on previously impaired securities 1,183   1,183 (600)
Recoveries 3   13  
Ending balance $ 1,278 $ 261 $ 1,278 $ 261