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Goodwill, Core Deposit Intangible and Other Intangible Assets - Summary of Changes in Goodwill, Core Deposit Intangible Assets and Customer Relationship Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Schedule Of Goodwill And Intangible Assets [Line Items]        
Beginning balance, Goodwill $ 148,353 $ 148,353 $ 148,353 $ 148,353
Ending balance, Goodwill 148,353 148,353 148,353 148,353
Amortization (1,738) (1,947) (5,335) (5,732)
Core Deposits        
Schedule Of Goodwill And Intangible Assets [Line Items]        
Ending balance, Goodwill 16,674   16,674  
Beginning balance 18,346 25,459 21,809 29,111
Amortization (1,672) (1,825) (5,135) (5,477)
Ending balance 16,674 23,634 16,674 23,634
Accumulated amortization $ 38,792 $ 31,832 $ 38,792 $ 31,832
Weighted average remaining amortization period 5 years 5 years 9 months 18 days 5 years 5 years 9 months 18 days
Customer Relationships        
Schedule Of Goodwill And Intangible Assets [Line Items]        
Beginning balance $ 2,335 $ 2,658 $ 2,469 $ 2,791
Amortization (66) (122) (200) (255)
Ending balance 2,269 2,536 2,269 2,536
Accumulated amortization $ 947 $ 680 $ 947 $ 680
Weighted average remaining amortization period 8 years 6 months 9 years 8 months 12 days 8 years 6 months 9 years 8 months 12 days