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Investment Securities - Contractual Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Amortized Cost    
Due in one year or less $ 8,733  
Due after one year through five years 55,551  
Due after five years through ten years 63,330  
Due after ten years 131,368  
Amortized Cost 1,085,016 $ 883,832
Fair Value    
Due in one year or less 8,777  
Due after one year through five years 55,075  
Due after five years through ten years 62,935  
Due after ten years 125,016  
Fair Value 1,039,924 894,335
Amortized Cost    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 83,202  
Due after ten years 67,771  
Total investment securities 422,213 383,393
Fair Value    
Due in one year or less 0  
Due after one year through five years 0  
Due after five years through ten years 76,884  
Due after ten years 59,745  
Total investment securities 384,822 $ 376,331
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost 258,982  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value 251,803  
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date 150,973  
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value 136,629  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost 826,034  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value 788,121  
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date 271,240  
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value $ 248,193