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Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Goodwill    
Goodwill, beginning of period $ 305,125 $ 304,750
Additions 106,276 375
Goodwill, end of period 411,401 305,125
Core Deposit and Other Intangibles    
Intangible assets, beginning of period 5,978 5,869
Additions 37,462 375
Amortization (1,302) (266)
Intangible assets, end of period 42,138 5,978
Total    
Goodwill and intangible assets, beginning of period 311,103 310,619
Additions 143,738 750
Amortization (1,302) (266)
Goodwill and intangible assets, end of period $ 453,539 $ 311,103