Summary of Significant Accounting Policies - Business Combinations and Method of Accounting for Loans Acquired - (Details 4)	12 Months Ended
	Dec. 31, 2015 USD ($)
Business Combinations, Method of Accounting for Loans Acquired, and FDIC Indemnification Asset
Allowance for loan losses on acquired loans	$ 0
Habersham
Business Combinations, Method of Accounting for Loans Acquired, and FDIC Indemnification Asset
Covered portfolio's loss share coverage percentage	80.00%
CBT
Business Combinations, Method of Accounting for Loans Acquired, and FDIC Indemnification Asset
Minimum amount of commercial loans included in loan categories with common risk categories	$ 1,000,000
Minimum amount of outstanding contractual principal balances of commercial loans included in loan categories with common risk categories	$ 1,000,000
Covered portfolio's loss share coverage percentage	95.00%
Cape Fear | Loss covered under loss share agreements upto 110 million
Business Combinations, Method of Accounting for Loans Acquired, and FDIC Indemnification Asset
Covered portfolio's loss share coverage percentage	80.00%
Cape Fear | Minimum | Loss covered under loss share agreements over 110 million
Business Combinations, Method of Accounting for Loans Acquired, and FDIC Indemnification Asset
Covered portfolio's loss share coverage percentage	95.00%
Cape Fear | Maximum | Loss covered under loss share agreements upto 110 million
Business Combinations, Method of Accounting for Loans Acquired, and FDIC Indemnification Asset
Covered portfolio's loss share coverage amount	$ 110,000,000
Plantation | Loss covered under loss share agreements upto 110 million
Business Combinations, Method of Accounting for Loans Acquired, and FDIC Indemnification Asset
Covered portfolio's loss share coverage percentage	80.00%
Plantation | Loss covered under loss share agreements from 55 million to 65 million
Business Combinations, Method of Accounting for Loans Acquired, and FDIC Indemnification Asset
Covered portfolio's loss share coverage percentage	0.00%
Plantation | Minimum | Loss covered under loss share agreements from 55 million to 65 million
Business Combinations, Method of Accounting for Loans Acquired, and FDIC Indemnification Asset
Covered portfolio's loss share coverage amount	$ 55,000,000
Plantation | Minimum | Loss covered under loss share agreements over 65 million
Business Combinations, Method of Accounting for Loans Acquired, and FDIC Indemnification Asset
Covered portfolio's loss share coverage percentage	60.00%
Plantation | Maximum | Loss covered under loss share agreements upto 55 million
Business Combinations, Method of Accounting for Loans Acquired, and FDIC Indemnification Asset
Covered portfolio's loss share coverage amount	$ 55,000,000
Plantation | Maximum | Loss covered under loss share agreements from 55 million to 65 million
Business Combinations, Method of Accounting for Loans Acquired, and FDIC Indemnification Asset
Covered portfolio's loss share coverage amount	$ 65,000,000