After a decade on the sidelines, NBT Bancorp is back in the merger game.

The Norwich, N.Y., company has struck two deals in the last four months that would nearly double its size, to about $2.6 billion. In August, NBT said it would buy Lake Ariel (Pa.) Bancorp for about $93 million. This month the company announced a deal to buy Carbondale, Pa.-based Pioneer American Holding Co. - one of Lake Ariel's biggest rivals - for about $85 million.

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