Goodwill and Acquired Intangible Assets - Additional Information (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jul. 17, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 03, 2016	Mar. 11, 2016	Oct. 01, 2014
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 64,649,000	$ 25,211,000
Business Combination, Bargain Purchase, Gain Recognized, Amount	$ (416,000)	0	$ 416,000	$ 0
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months		2,876,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two		2,876,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three		2,876,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four		2,771,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five		$ 1,567,000
The Bank shares [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill							$ 25,200,000
Floridan Financial Group [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill						$ 31,600,000
BMO Harris's Orlando operations [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill					$ 7,800,000