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Investment Securities - Contractual Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Amortized Cost    
Due in one year or less $ 29,254  
Due after one year through five years 38,323  
Due after five years through ten years 43,983  
Due after ten years 107,479  
Amortized cost 1,424,969  
Fair Value    
Due in one year or less 28,962  
Due after one year through five years 36,884  
Due after five years through ten years 41,429  
Due after ten years 93,589  
Fair Value 1,318,072 $ 1,331,443
Amortized Cost    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 83,235  
Due after ten years 67,734  
Investment securities held to maturity, at amortized cost, net (fair value of $684,647 and $673,434, respectively) 760,163 766,396
Fair Value    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 70,107  
Due after ten years 52,564  
Total investment securities 684,647 $ 673,434
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost 219,039  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value 200,864  
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date 150,969  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value 122,671  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost 1,205,930  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value 1,117,208  
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 609,194  
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value $ 561,976