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Loans and Credit Quality (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]            
Non-PCI loans and leases $ 12,069,005   $ 11,904,684      
Loans and Leases Receivable, Deferred Income (34,816)   (22,252)      
Loans held for investment, net 12,034,189   11,882,432      
Loans and Leases Receivable, Allowance (99,375)   (84,455)      
Loans and leases, net 11,934,814   11,797,977      
Mortgage Loans on Real Estate [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Non-PCI loans and leases 5,640,855   5,607,316      
Loans and Leases Receivable, Allowance (29,908)     $ (22,276)    
Real Estate Construction [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Non-PCI loans and leases 348,383   316,086      
Loans and Leases Receivable, Allowance (3,908)     (4,302)    
Commercial Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Non-PCI loans and leases 5,993,254   5,879,575      
Loans and Leases Receivable, Allowance (50,531)     (35,530)    
Consumer Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Non-PCI loans and leases 86,513   101,707      
Loans and Leases Receivable, Allowance (700)     (3,415)    
NonCovered [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Non-PCI loans and leases 11,846,313   11,613,832      
Loans and Leases Receivable, Deferred Income (34,762)   (22,191)      
Loans held for investment, net 11,811,551   11,591,641 10,791,669    
Loans and Leases Receivable, Allowance (85,047) $ (79,680) (70,456) (65,523) $ (59,980) $ (60,241)
Loans and leases, net 11,726,504   11,521,185      
NonCovered [Member] | Mortgage Loans on Real Estate [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Non-PCI loans and leases 5,428,698   5,350,827      
Loans held for investment, net 5,415,670   5,340,560 5,236,452    
Loans and Leases Receivable, Allowance   (30,911) (25,097)   (24,352) (26,078)
NonCovered [Member] | Real Estate Construction [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Non-PCI loans and leases 346,919   309,162      
Loans held for investment, net 343,500   307,135 298,477    
Loans and Leases Receivable, Allowance   (2,173) (4,248)   (4,103) (4,298)
NonCovered [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Non-PCI loans and leases 5,984,472   5,852,420      
Loans held for investment, net 5,966,102   5,842,463 5,193,735    
Loans and Leases Receivable, Allowance   (45,794) (39,858)   (27,740) (26,921)
NonCovered [Member] | Consumer Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Non-PCI loans and leases 86,224   101,423      
Loans held for investment, net 86,279   101,483 63,005    
Loans and Leases Receivable, Allowance   $ (802) (1,253)   $ (3,785) $ (2,944)
Purchased Credit Impaired Loans and Leases [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Non-PCI loans and leases 222,692   290,852      
Loans and Leases Receivable, Deferred Income (54)   (61)      
Loans held for investment, net 222,638   290,791 $ 398,436    
Loans and Leases Receivable, Allowance (14,328)   (13,999)      
Loans and leases, net 208,310   276,792      
Purchased Credit Impaired Loans and Leases [Member] | Mortgage Loans on Real Estate [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Non-PCI loans and leases 212,157   256,489      
Purchased Credit Impaired Loans and Leases [Member] | Real Estate Construction [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Non-PCI loans and leases 1,464   6,924      
Purchased Credit Impaired Loans and Leases [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Non-PCI loans and leases 8,782   27,155      
Purchased Credit Impaired Loans and Leases [Member] | Consumer Portfolio Segment [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Non-PCI loans and leases $ 289   $ 284