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Fair Value Measurements (Details 5) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Covered loans
Sep. 30, 2014
Covered loans
Dec. 31, 2013
Covered loans
Sep. 30, 2014
Non-covered loans
Sep. 30, 2013
Non-covered loans
Sep. 30, 2014
Non-covered loans
Sep. 30, 2013
Non-covered loans
Dec. 31, 2013
Non-covered loans
Sep. 13, 2013
FNB
Covered loans
Bank
Sep. 30, 2014
Level 2
Dec. 31, 2013
Level 2
Sep. 30, 2014
Level 3
Dec. 31, 2013
Level 3
Sep. 30, 2014
Total Fair Value
Dec. 31, 2013
Total Fair Value
Sep. 30, 2014
Non-recurring
Covered loans
Sep. 30, 2014
Non-recurring
Covered loans
Sep. 30, 2014
Non-recurring
Non-covered loans
Sep. 30, 2013
Non-recurring
Non-covered loans
Sep. 30, 2014
Non-recurring
Non-covered loans
Sep. 30, 2013
Non-recurring
Non-covered loans
Sep. 30, 2014
Non-recurring
Level 2
Sep. 30, 2014
Non-recurring
Level 2
Estimated fair value
Covered loans
Dec. 31, 2013
Non-recurring
Level 2
Estimated fair value
Covered loans
Sep. 30, 2014
Non-recurring
Level 2
Estimated fair value
Non-covered loans
Dec. 31, 2013
Non-recurring
Level 2
Estimated fair value
Non-covered loans
Sep. 30, 2014
Non-recurring
Level 3
Sep. 30, 2014
Non-recurring
Level 3
PlainsCapital
PCI loans
Nov. 30, 2012
Non-recurring
Level 3
PlainsCapital
PCI loans
Sep. 13, 2013
Non-recurring
Level 3
FNB
Covered loans
Bank
Sep. 30, 2014
Non-recurring
Level 3
FNB
PCI loans
Sep. 13, 2013
Non-recurring
Level 3
FNB
PCI loans
Sep. 30, 2014
Non-recurring
Level 3
Estimated fair value
Sep. 30, 2014
Non-recurring
Level 3
Estimated fair value
Minimum
Sep. 30, 2014
Non-recurring
Level 3
Estimated fair value
Maximum
Sep. 30, 2014
Non-recurring
Level 3
Estimated fair value
Covered loans
Dec. 31, 2013
Non-recurring
Level 3
Estimated fair value
Covered loans
Sep. 30, 2014
Non-recurring
Total Fair Value
Fair value measurements                                                                                        
Fair value of loans acquired                                                                     $ 172,900,000     $ 822,800,000            
Default rate (as a percent)                                                                   46.00%     63.00%              
Loss severity rate (as a percent)                                                                   52.00%     38.00%              
Prepayment speeds (as a percent)                                                                   0.00%     4.00%              
Weighted average expected loss (as a percent)                                                                   24.00%     24.00%              
Discount rate of OREO per month (as a percent)                                                                             1.00%          
Estimated holding period of discount rate per month of OREO                                                                               6 months 24 months      
Acquired OREO                             135,200,000                                         135,200,000                
Other real estate owned                                                         126,800,000 142,800,000 2,300,000 4,800,000                   126,800,000 142,800,000  
Non-covered impaired loans 3,729,816,000   3,729,816,000     3,481,405,000       3,729,816,000   3,729,816,000   3,481,405,000   341,846,000 281,712,000 3,406,917,000 3,119,319,000 3,748,763,000 3,401,031,000                       30,061,000                     30,061,000
Covered impaired loans 747,514,000   747,514,000     1,005,308,000 747,514,000 747,514,000 1,005,308,000                 823,111,000 997,371,000 823,111,000 997,371,000                       74,015,000                     74,015,000
Covered other real estate owned 126,798,000 133,861,000 126,798,000 133,861,000 142,174,000 142,833,000                                           45,050,000         20,803,000                     65,853,000
Total Gains (Losses) of impaired loans 4,033,000 10,658,000 12,808,000 34,952,000     (153,000) 3,151,000   4,186,000 10,658,000 9,657,000 34,952,000                 242,000 (2,790,000) (1,714,000) (2,352,000) (2,151,000) (3,011,000)                                  
Total Gains (Losses) of other real estate owned                                           $ (14,440,000) $ (17,399,000) $ (210,000) $ (1,381,000) $ (321,000) $ (1,571,000)