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Securities - Schedule of Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Available for sale    
Amortized cost within one year $ 5,449  
Amortized cost one to five years 364,641  
Amortized cost for five to ten years 192,161  
Amortized cost for after ten years 238,433  
Amortized cost, available for sale 800,684  
Total available for sale investment securities, amortized cost 1,024,622 $ 1,137,702
Fair value within one year 5,329  
Fair value for one to five years 330,882  
Fair value for five to ten years 153,784  
Fair value for after ten years 187,971  
Fair value, available for sale 677,966  
Fair value, available for sale, mortgage obligations and backed pools 865,168 997,558
Held to maturity    
Within one year, amortized cost 35,434  
One to five years, amortized cost 228,119  
Five to ten years, amortized cost 340,018  
After ten years, amortized cost 948,937  
Amortized cost, held to maturity 1,552,508  
Amortized cost, held to maturity, mortgage obligations and backed pools 1,966,483 2,022,748
Within one year, fair value 35,149  
One to five years, fair value 212,226  
Five to ten years, fair value 278,547  
After ten years, fair value 696,891  
Fair value, held to maturity 1,222,813  
Fair value, held to maturity, mortgage obligations and backed pools 1,556,845 1,681,309
Federal agency collateralized mortgage obligations    
Available for sale    
Amortized cost, available for sale, mortgage obligations and backed pools 23,210  
Total available for sale investment securities, amortized cost 23,210 33,011
Fair value, available for sale, mortgage obligations and backed pools 21,313 31,215
Held to maturity    
Amortized cost, held to maturity, mortgage obligations and backed pools 52,573 56,564
Fair value, held to maturity, mortgage obligations and backed pools 42,677 47,699
Federal agency mortgage-backed pools    
Available for sale    
Amortized cost, available for sale, mortgage obligations and backed pools 200,728  
Total available for sale investment securities, amortized cost 200,728 220,963
Fair value, available for sale, mortgage obligations and backed pools 165,889 190,656
Held to maturity    
Amortized cost, held to maturity, mortgage obligations and backed pools 328,410 343,953
Fair value, held to maturity, mortgage obligations and backed pools 264,057 287,239
Private labeled mortgage-backed pools    
Held to maturity    
Amortized cost, held to maturity, mortgage obligations and backed pools 32,992 35,466
Fair value, held to maturity, mortgage obligations and backed pools $ 27,298 $ 29,973