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Fair Value Measurements and Fair Value of Financial Instruments, Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Financial assets [Abstract]    
HTM securities $ 783,986 $ 812,647
Carrying Amount [Member] | Level 1 [Member]    
Financial liabilities [Abstract]    
Subordinated debt 120,061 98,000
Carrying Amount [Member] | Level 2 [Member]    
Financial assets [Abstract]    
HTM securities 914,520 919,517
Financial liabilities [Abstract]    
Time deposits 1,344,199 433,772
Long-term debt 29,834 4,815
Junior subordinated debt 101,196 101,196
Carrying Amount [Member] | Level 3 [Member]    
Financial assets [Abstract]    
Net loans 9,556,887 8,049,909
Estimated Fair Value [Member] | Level 1 [Member]    
Financial liabilities [Abstract]    
Subordinated debt 110,057 92,883
Estimated Fair Value [Member] | Level 2 [Member]    
Financial assets [Abstract]    
HTM securities 783,986 812,647
Financial liabilities [Abstract]    
Time deposits 1,301,989 413,868
Long-term debt 29,114 4,539
Junior subordinated debt 99,259 98,372
Estimated Fair Value [Member] | Level 3 [Member]    
Financial assets [Abstract]    
Net loans $ 9,097,545 $ 7,840,350