Add the rinsed navy beans, diced ham, minced garlic, and diced onion to the slow cooker.
Pour in the chicken broth and water.
Stir in the dried thyme, salt, and black pepper.
Place the bay leaves on top of the liquid.
Cover and cook on low for 8 hours until the beans are soft.
Remove and discard the bay leaves.
Taste and adjust salt if needed before serving.