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STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended
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Jan. 17, 2014 | Mar. 31, 2014 | Mar. 31, 2013 | Jan. 17, 2014 MetroCorp | May 01, 2013 Series A Non-Cumulative Perpetual Convertible Preferred Stock | Apr. 30, 2008 Series A Non-Cumulative Perpetual Convertible Preferred Stock | Jul. 17, 2013 Common Stock | Jan. 31, 2014 Common Stock | Mar. 31, 2014 Common Stock
Class of Stock |  |  |  |  |  |  |  |  |
Number of shares issued during the period |  |  |  |  |  | 200,000 |  |  |
Preferred stock dividend rate (as a percent) |  |  |  |  |  | 8.00% |  |  |
Preferred stock liquidation preference (in dollars per share) |  |  |  |  |  | $ 1,000 |  |  |
Proceeds from issuance of convertible preferred stock |  |  |  |  |  | $ 194.1 |  |  |
Preferred shares converted |  |  |  |  | 85,710 |  |  |  |
Common stock issued on conversion of convertible preferred stock |  |  |  |  | 5,594,080 |  |  |  |
Final consideration (in shares) |  | 5,583,093 |  | 5,583,093 |  |  |  |  |
Final consideration in cash |  |  |  | 89.4 |  |  |  |  |
Common stock equivalent to assumed obligation of acquiree's unexercised warrant (in shares) | 230,282 |  |  |  |  |  |  |  |
Amount of stock repurchase approved by the Board of Directors |  |  |  |  |  |  | 100.0 |  |
Purchase of treasury stock pursuant to the Stock Repurchase Program, shares |  |  | 3,543,100 |  |  |  |  |  |
Weighted average price of shares repurchased (in dollars per share) |  |  | $ 24.53 |  |  |  |  |  |
Total cost of repurchase of treasury shares |  |  | 87.0 |  |  |  |  |  |
Quarterly Dividends |  |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  | $ 0.18 | $ 0.15 |  |  |  |  | $ 0.18 |
Common stock cash dividends paid |  |  |  |  |  |  |  |  | $ 25.9

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