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, 2017	Dec. 31, 2016	Dec. 31, 2015
Loan Receivable Type
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 21,281	$ 90,178	$ 64,245
Provision for loan and lease losses, net	6,725	2,255	38,040
Charge-offs	0	134	14,610
FDIC Indemnification Asset Additional Estimated Losses Recoveries	0	3,391	2,503
Allowance de-recognition from new policy	(2,832)	(74,409)
Balance at end of period	25,174	21,281	90,178
Loans secured by 1-4 family residential properties, covered [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	11,947	22,570	5,469
Provision for loan and lease losses, net	5,045	1,080	17,718
Charge-offs	0	0	722
FDIC Indemnification Asset Additional Estimated Losses Recoveries	0	3,391	105
Allowance de-recognition from new policy	(1,805)	(15,094)
Balance at end of period	15,187	11,947	22,570
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	9,328	67,365	58,511
Provision for loan and lease losses, net	1,680	1,183	20,043
Charge-offs	0	134	13,587
FDIC Indemnification Asset Additional Estimated Losses Recoveries	0	0	2,398
Allowance de-recognition from new policy	(1,026)	(59,086)
Balance at end of period	9,982	9,328	67,365
Consumer Loan [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	6	243	265
Provision for loan and lease losses, net	0	(8)	279
Charge-offs	0	0	301
FDIC Indemnification Asset Additional Estimated Losses Recoveries	0	0	0
Allowance de-recognition from new policy	(1)	(229)
Balance at end of period	$ 5	$ 6	$ 243