Borrowings - Schedule of Junior Subordinated Debentures and Related Trust Preferred and Common Equity Securities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Junior subordinated debt	$ 75,261
Trust preferred securities	73,000
Common equity securities	2,261
Unamortized debt discount	5,600
SBCF Capital Trust I
Debt Instrument [Line Items]
Junior subordinated debt	20,619
Trust preferred securities	20,000
Common equity securities	$ 619
Interest rate on junior subordinated loans	3.69%
SBCF Capital Trust I | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	17.50%
SBCF Statutory Trust II
Debt Instrument [Line Items]
Junior subordinated debt	$ 20,619
Trust preferred securities	20,000
Common equity securities	$ 619
Interest rate on junior subordinated loans	3.22%
SBCF Statutory Trust II | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	13.30%
SBCF Statutory Trust III
Debt Instrument [Line Items]
Junior subordinated debt	$ 12,372
Trust preferred securities	12,000
Common equity securities	$ 372
Interest rate on junior subordinated loans	3.24%
SBCF Statutory Trust III | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	13.50%
BANKshares, Inc. Statutory Trust I
Debt Instrument [Line Items]
Junior subordinated debt	$ 5,155
Trust preferred securities	5,000
Common equity securities	$ 155
Interest rate on junior subordinated loans	5.20%
BANKshares, Inc. Statutory Trust I | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	32.50%
BANKshares, Inc. Statutory Trust II
Debt Instrument [Line Items]
Junior subordinated debt	$ 4,124
Trust preferred securities	4,000
Common equity securities	$ 124
Interest rate on junior subordinated loans	4.69%
BANKshares, Inc. Statutory Trust II | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	27.90%
BANKshares, Inc. Capital Trust I
Debt Instrument [Line Items]
Junior subordinated debt	$ 5,155
Trust preferred securities	5,000
Common equity securities	$ 155
Interest rate on junior subordinated loans	3.30%
BANKshares, Inc. Capital Trust I | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	13.90%
Grand Bank Capital Trust I
Debt Instrument [Line Items]
Junior subordinated debt	$ 7,217
Trust preferred securities	7,000
Common equity securities	$ 217
Interest rate on junior subordinated loans	3.94%
Grand Bank Capital Trust I | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	19.80%