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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
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loan Receivable Type [Domain]      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period $ 25,174 $ 21,281 $ 90,178
Provision for loan and lease losses, net 2,567 6,725 2,255
Charge-offs     134
FDIC Indemnification Asset Additional Estimated Losses Recoveries     3,391
Allowance de-recognition from new policy (2,770) (2,832) (74,409)
Balance at end of period 24,971 25,174 21,281
Loans secured by 1-4 family residential properties, covered [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period 15,187 11,947 22,570
Provision for loan and lease losses, net 1,806 5,045 1,080
Charge-offs     0
FDIC Indemnification Asset Additional Estimated Losses Recoveries     3,391
Allowance de-recognition from new policy (1,611) (1,805) (15,094)
Balance at end of period 15,382 15,187 11,947
Commercial      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period 9,983 9,328 67,365
Provision for loan and lease losses, net 761 1,680 1,183
Charge-offs     134
FDIC Indemnification Asset Additional Estimated Losses Recoveries     0
Allowance de-recognition from new policy (1,159) (1,025) (59,086)
Balance at end of period 9,585 9,983 9,328
Consumer Loan [Member]      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance at beginning of period 4 6 243
Provision for loan and lease losses, net 0 0 (8)
Charge-offs     0
FDIC Indemnification Asset Additional Estimated Losses Recoveries     0
Allowance de-recognition from new policy 0 (2) (229)
Balance at end of period $ 4 $ 4 $ 6