Business Combinations - Purchased Credit Impaired Loans (Details) - USD ($) $ in Thousands	Nov. 03, 2017	Oct. 20, 2017
NorthStar Bank
Business Acquisition [Line Items]
Total purchased credit-impaired loan acquired		$ 136,832
NorthStar Bank | Purchased Credit Impaired Loans
Business Acquisition [Line Items]
Contractually required principal and interest		5,596
Non-accretable difference		(689)
Cash flows expected to be collected		4,907
Accretable yield		(614)
Total purchased credit-impaired loan acquired		$ 4,293
Palm Beach Community Bank
Business Acquisition [Line Items]
Total purchased credit-impaired loan acquired	$ 270,318
Palm Beach Community Bank | Purchased Credit Impaired Loans
Business Acquisition [Line Items]
Contractually required principal and interest	4,768
Non-accretable difference	(1,002)
Cash flows expected to be collected	3,766
Accretable yield	0
Total purchased credit-impaired loan acquired	$ 3,766