Capital One led the Top 20 banks in the nation in gains in both deposit dollars and number of accounts in the final quarter of 2012, according to a Bank Innovation analysis of  FDIC data. Capital One’s number of deposit accounts grew 93% over 2011, and deposit dollars grew 81%. Its number of deposit accounts grew 89% over Q3 2012, and its deposit dollars grew 87% over the same period.

The large increase stemmed from the bank’s acquisition of ING Direct, which in February 2013 was rebranded as Capital One 360.

ING Direct filed with the FDIC in Q3 but not in Q4, according to an FDIC spokesperson. The banks officially merged in November 2012, according to the FDIC.

Overall the Top 20 banks dropped 3.5% of their accounts over the past year while gaining 7.5% in deposit dollars. This gain in efficiency continues the trend we’ve seen over the last several quarters.

Bank of America is the nation’s largest bank in terms of deposit dollars and number of accounts, with $510 billion in 66 million accounts, at the end of 2012.

HSBC lost the most accounts and deposit dollars over last year, losing 38% of its deposit accounts and 22% of its deposit dollars. HSBC also lost the most deposit dollars since last quarter, losing 3% or $1.2 billion, while US Bank dropped the most deposit accounts, 772,000 or 5.9%.

FDIC data for Q3 2012 is here.

Rank in YOY Gains in Retail Deposits at the Top 20 Banks ($-figures in 1,000s)

Rank in QOQ Gains in Retail Deposits at the Top 20 Banks ($-figures in 1,000s)