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Goodwill and Other Intangible Assets - Changes in Goodwill and Other Intangibles (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Finite-lived Intangible Assets [Roll Forward]          
Core deposit premiums, beginning of period     $ 106,235    
Amortization of intangibles $ (4,096) $ (3,332) (7,582) $ (6,676)  
Core deposit premiums, end of period 137,285   137,285   $ 106,235
Spirit of Texas Bancshares, Inc.          
Finite-lived Intangible Assets [Roll Forward]          
Core deposit premiums, end of period 36,500   36,500    
Triumph Bancshares Inc          
Finite-lived Intangible Assets [Roll Forward]          
Core deposit premiums, beginning of period     5,100    
Core deposit premiums, end of period         5,100
Landmark Community Bank          
Finite-lived Intangible Assets [Roll Forward]          
Core deposit premiums, beginning of period     4,200    
Core deposit premiums, end of period         4,200
Core Deposit Premium          
Finite-lived Intangible Assets [Roll Forward]          
Core deposit premiums, beginning of period     93,862 97,363 97,363
Acquisitions     36,500   9,295
Disposition of intangible asset     0   (674)
Amortization of intangibles     (6,895)   (12,122)
Core deposit premiums, end of period 123,467   123,467   93,862
Books of Business Intangible          
Finite-lived Intangible Assets [Roll Forward]          
Core deposit premiums, beginning of period     12,373 $ 13,747 13,747
Acquisitions     2,131   0
Amortization of intangibles     (686)   (1,374)
Core deposit premiums, end of period $ 13,818   $ 13,818   $ 12,373