How did Scout learn to read and write?

From the text:

"I mumbled that I was sorry and retired meditating upon my crime. I never deliberately learned to read, but somehow I had been wallowing illicitly in the daily papers. In the long hours of church—was it then I learned? I could not remember not being able to read hymns. Now that I was compelled to think about it, reading was something that just came to me, as learning to fasten the seat of my union suit without looking around, or achieving two bows from a snarl of shoelaces. I could not remember when the lines above Atticus’s moving finger separated into words, but I had stared at them all the evenings in my memory, listening to the news of the day, Bills to Be Enacted into Laws, the diaries of Lorenzo Dow—anything Atticus happened to be reading when I crawled into his lap every night."