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Allowance for Loan and Lease Losses (Allowance for Acquired Eurobank Loan and Lease Losses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2015
Loan Receivable Type      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period $ 90,178 $ 64,245  
Provision for loan and lease losses, net (805)    
Charge-offs (134)   $ 4,809
FDIC Indemnification Asset Additional Estimated Losses Recoveries (1,444)   1,597
Balance at end of period 92,293    
Loans secured by 1-4 family residential properties, covered [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period 22,570 15,522  
Provision for loan and lease losses, net 53    
Charge-offs 0    
FDIC Indemnification Asset Additional Estimated Losses Recoveries (1,444)    
Balance at end of period 23,961    
Commercial Loan [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period 67,365 48,334  
Provision for loan and lease losses, net (858)    
Charge-offs (134)    
FDIC Indemnification Asset Additional Estimated Losses Recoveries 0    
Balance at end of period 68,089    
Consumer Loan [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period 243 389  
Provision for loan and lease losses, net 0    
Charge-offs 0    
FDIC Indemnification Asset Additional Estimated Losses Recoveries 0    
Balance at end of period 243    
Auto and Leasing [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period 0 0  
Provision for loan and lease losses, net 0    
Charge-offs 0    
FDIC Indemnification Asset Additional Estimated Losses Recoveries 0    
Balance at end of period $ 0    
Eurobank Acquired Loans | Loan Receivable Type      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period   64,245  
Provision for loan and lease losses, net   4,809  
FDIC Indemnification Asset Additional Estimated Losses Recoveries   1,597  
Balance at end of period   70,651 70,651
Eurobank Acquired Loans | Loans secured by 1-4 family residential properties, covered [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period   15,522  
Provision for loan and lease losses, net   1,818  
Charge-offs   1,818  
FDIC Indemnification Asset Additional Estimated Losses Recoveries   0  
Balance at end of period   17,340 17,340
Eurobank Acquired Loans | Commercial Loan [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period   48,334  
Provision for loan and lease losses, net   2,991  
FDIC Indemnification Asset Additional Estimated Losses Recoveries   1,597  
Balance at end of period   52,922 52,922
Eurobank Acquired Loans | Consumer Loan [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period   389  
Provision for loan and lease losses, net   0  
Charge-offs   0  
FDIC Indemnification Asset Additional Estimated Losses Recoveries   0  
Balance at end of period   389 389
Eurobank Acquired Loans | Auto and Leasing [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period   0  
Provision for loan and lease losses, net   0  
Charge-offs   0  
FDIC Indemnification Asset Additional Estimated Losses Recoveries   0  
Balance at end of period   $ 0 $ 0