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Allowance for Loan and Lease Losses (Allowance for Acquired Eurobank Loan and Lease Losses) (Details) - Eurobank Acquired Loans - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Loan Receivable Type        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period $ 24,314 $ 21,786 $ 25,174 $ 21,281
Provision for loan and lease losses, net 306 2,541 1,110 4,573
Allowance de-recognition from new policy (339) (1,182) (2,003) (2,709)
Balance at end of period 24,281 23,145 24,281 23,145
Loans secured by 1-4 family residential properties, covered [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 15,170 13,651 15,187 11,947
Provision for loan and lease losses, net 231 1,139 1,015 4,011
Allowance de-recognition from new policy (246) (571) (1,047) (1,739)
Balance at end of period 15,155 14,219 15,155 14,219
Commercial        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 9,140 8,131 9,983 9,328
Provision for loan and lease losses, net 75 1,402 95 562
Allowance de-recognition from new policy (93) (611) (956) (968)
Balance at end of period 9,122 8,922 9,122 8,922
Consumer Loan [Member]        
Allowance for Loan and Lease Losses [Roll Forward]        
Balance at beginning of period 4 4 4 6
Provision for loan and lease losses, net 0 0 0 0
Allowance de-recognition from new policy 0 0 0 (2)
Balance at end of period $ 4 $ 4 $ 4 $ 4