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STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May. 01, 2013 | Apr. 30, 2008 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jan. 17, 2014 | Jan. 16, 2014 | Jul. 17, 2013 | Jan. 23, 2013 | Dec. 31, 2012
Class of Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive (loss) income (“AOCI”), net of tax |  |  | $ (14,941,000) |  |  |  | $ 4,237,000 |  |  |  |  |  |  |  |  |  | $ (14,941,000) | $ 4,237,000 | $ (30,459,000) |  |  |  |  | $ 4,669,000
Purchase of treasury stock pursuant to the Stock Repurchase Program, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,026,807 |  |  |  |  |
Weighted average price of shares repurchased (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24.89 |  |  |  |  |
Total cost of repurchase of treasury shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 199,992,000 |  |  |  |  |
Quarterly Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 |  |  |  |  |  |  | $ 0.80 | $ 0.72 | $ 0.60 |  |  |  |  |
MetroCorp |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants converted into the right to acquire shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 230,282 | 771,429 |  |  |
Number of warrants exercised |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Series A Non-Cumulative Perpetual Convertible Preferred 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 |  | $ 194,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares converted | 85,710 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued on conversion of convertible preferred stock | 5,594,080 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.00 |  |  |  |  |
Preferred stock cash dividends paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,400,000 |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of stock repurchase approved by the Board of Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 | $ 200,000,000 |
Quarterly Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  | $ 0.2 | $ 0.2 | $ 0.2 |  |  |  |  | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.15 | $ 0.15 | $ 0.15 | $ 0.2 | $ 0.18 | $ 0.15 |  |  |  |  |
Common stock cash dividends paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 116,200,000 | $ 104,000,000 | $ 83,300,000 |  |  |  |  |

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