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Investment Securities - Contractual Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Amortized Cost    
Due in one year or less $ 26,280  
Due after one year through five years 63,151  
Due after five years through ten years 67,834  
Due after ten years 124,415  
Amortized Cost 1,491,440  
Fair Value    
Due in one year or less 25,952  
Due after one year through five years 60,858  
Due after five years through ten years 63,738  
Due after ten years 104,748  
Fair Value 1,356,142 $ 894,335
Amortized Cost    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 83,219  
Due after ten years 67,729  
Investment securities held to maturity, at amortized cost, net (fair value of $677,335 and $376,331, respectively) 773,319 383,393
Fair Value    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 68,150  
Due after ten years 49,882  
Total investment securities 677,335 $ 376,331
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost 281,680  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value 255,296  
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date 150,948  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value 118,032  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost 1,209,760  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value 1,100,846  
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 622,371  
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value $ 559,303