This excerpt taken from the PNC 10-K filed Feb 29, 2008.
Riggs National Corporation
We acquired Riggs National Corporation (Riggs), a Washington, D.C. based banking company, effective May 13, 2005. Under the terms of the agreement, Riggs merged into The PNC Financial Services Group, Inc. and PNC Bank, National Association (PNC Bank, N.A.) acquired substantially all of the assets of Riggs Bank, National Association, the principal banking subsidiary of Riggs. The acquisition gave us a substantial presence on which to build a market leading franchise in the affluent Washington, D.C. metropolitan area. In connection with the acquisition, Riggs shareholders received an aggregate of approximately $297 million in cash and 6.6 million shares of PNC common stock valued at $356 million.