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Fair Value Measurements - Schedule of Estimated Fair Value of Financial Instruments where Fair Value Differs from Carrying Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Financial assets:    
Debt securities held to maturity, carrying value $ 230,254 $ 242,101
Debt securities held to maturity, fair value 195,165 217,609
Carrying Value    
Financial assets:    
Loans 3,319,421 3,314,553
Financial liabilities:    
Time deposits 1,579,458 1,119,510
Advances from the FHLB 595,000 906,486
Carrying Value | Senior notes    
Financial liabilities:    
Senior notes 59,447 59,210
Carrying Value | Subordinated notes    
Financial liabilities:    
Junior subordinated debentures 29,412 29,284
Carrying Value | Junior subordinated debentures    
Financial liabilities:    
Junior subordinated debentures 64,178 64,178
Estimated Fair Value    
Financial assets:    
Loans 3,145,042 3,181,696
Financial liabilities:    
Time deposits 1,569,852 1,099,294
Advances from the FHLB 588,604 873,852
Estimated Fair Value | Senior notes    
Financial liabilities:    
Senior notes 56,293 58,755
Estimated Fair Value | Subordinated notes    
Financial liabilities:    
Junior subordinated debentures 28,481 28,481
Estimated Fair Value | Junior subordinated debentures    
Financial liabilities:    
Junior subordinated debentures $ 63,237 $ 64,182