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Loans - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance $ 87,161 $ 64,586 $ 86,670
Allowance for loan credit losses - BTH merger   5,527  
Charge-offs 12,049 8,759 12,234
Recoveries 4,242 4,194 948
Provision (17,514) (21,613) 10,798
Ending balance 96,868 87,161 64,586
Average balance $ 7,442,084 $ 5,920,465 $ 5,343,976
Net charge-offs to loan average balance (annualized) 0.10% 0.08% 0.21%
PCD loans acquired   $ 10,800  
Provision (benefit) for credit losses $ 16,800 24,700 $ (10,800)
Provision (benefit) for loan credit losses 17,514 21,613 (10,798)
Provision (release) for off-balance sheet commitments 75 2,300 (68)
Credit loss expense (benefit) for held to maturity securities (836) 732 101
Real estate | Commercial real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 19,772 13,425 15,430
Allowance for loan credit losses - BTH merger   1  
Charge-offs 42 166 170
Recoveries 140 40 65
Provision 245 (6,472) 1,900
Ending balance 19,625 19,772 13,425
Average balance $ 2,404,530 $ 1,951,246 $ 1,501,890
Net charge-offs to loan average balance (annualized) 0.00% 0.01% 0.01%
Provision (benefit) for loan credit losses $ (245) $ 6,472 $ (1,900)
Real estate | Construction/land/land development      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 7,776 4,011 8,191
Allowance for loan credit losses - BTH merger   0  
Charge-offs 0 0 0
Recoveries 3 211 0
Provision (2,211) (3,554) 4,180
Ending balance 9,990 7,776 4,011
Average balance $ 1,015,178 $ 708,758 $ 528,618
Net charge-offs to loan average balance (annualized) 0.00% (0.03%) 0.00%
Provision (benefit) for loan credit losses $ 2,211 $ 3,554 $ (4,180)
Real estate | Residential real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 8,230 6,116 9,418
Allowance for loan credit losses - BTH merger   0  
Charge-offs 27 91 78
Recoveries 17 102 117
Provision (2,399) (2,103) 3,341
Ending balance 10,619 8,230 6,116
Average balance $ 1,629,589 $ 1,143,190 $ 916,039
Net charge-offs to loan average balance (annualized) 0.00% 0.00% 0.00%
Provision (benefit) for loan credit losses $ 2,399 $ 2,103 $ (3,341)
Commercial and Industrial      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 50,148 40,146 51,857
Allowance for loan credit losses - BTH merger   5,525  
Charge-offs 11,833 8,459 11,923
Recoveries 4,068 3,825 717
Provision (12,947) (9,111) 505
Ending balance 55,330 50,148 40,146
Average balance $ 2,054,081 $ 1,675,719 $ 1,627,077
Net charge-offs to loan average balance (annualized) 0.38% 0.28% 0.69%
Provision (benefit) for loan credit losses $ 12,947 $ 9,111 $ (505)
Mortgage warehouse lines of credit      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 379 340 856
Allowance for loan credit losses - BTH merger   0  
Charge-offs 0 0 0
Recoveries 0 0 0
Provision (150) (39) 516
Ending balance 529 379 340
Average balance $ 314,079 $ 420,639 $ 753,588
Net charge-offs to loan average balance (annualized) 0.00% 0.00% 0.00%
Provision (benefit) for loan credit losses $ 150 $ 39 $ (516)
Consumer      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 856 548 918
Allowance for loan credit losses - BTH merger   1  
Charge-offs 147 43 63
Recoveries 14 16 49
Provision (52) (334) 356
Ending balance 775 856 548
Average balance $ 24,627 $ 20,913 $ 16,764
Net charge-offs to loan average balance (annualized) 0.54% 0.13% 0.08%
Provision (benefit) for loan credit losses $ 52 $ 334 $ (356)