Loans and Leases - Summary of Major Loan and Lease Categories (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	$ 2,858,027	$ 2,390,832
Total Loans and Leases Held for Investment, Acquired	652,143	895,054
Total Loans and Leases Held for Investment	3,510,170	3,285,886	$ 2,345,037
Unearned Lease Income, Originated	(15,224)	(15,970)
Unearned Lease Income, Acquired	0	0
Unearned lease income, included in the above table	(15,224)	(15,970)
Net deferred costs, Originated	4,389	4,503
Net deferred costs, Acquired	0	0
Net deferred costs, included in the above table	4,389	4,503
Overdraft Deposits, Originated	68	84
Overdraft Deposits, Acquired	0	0
Overdraft deposits included in the above table	68	84
Commercial, Financial and Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	819,487	663,221
Total Loans and Leases Held for Investment, Acquired	85,680	160,045
Total Loans and Leases Held for Investment	905,167	823,266	579,460
Real Estate-Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	1,128,602	909,581
Total Loans and Leases Held for Investment, Acquired	375,122	465,368
Total Loans and Leases Held for Investment	1,503,724	1,374,949
Real Estate-Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	162,323	142,891
Total Loans and Leases Held for Investment, Acquired	8,476	31,953
Total Loans and Leases Held for Investment	170,799	174,844
Real Estate-Residential Secured for Business Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	194,369	151,931
Total Loans and Leases Held for Investment, Acquired	99,734	142,137
Total Loans and Leases Held for Investment	294,103	294,068	230,222
Real Estate Residential Secured For Personal Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	235,782	210,377
Total Loans and Leases Held for Investment, Acquired	70,599	80,431
Total Loans and Leases Held for Investment	306,381	290,808
Real Estate-Home Equity Secured for Personal Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	159,868	147,982
Total Loans and Leases Held for Investment, Acquired	12,386	14,857
Total Loans and Leases Held for Investment	172,254	162,839
Loans to Individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	27,442	30,110
Total Loans and Leases Held for Investment, Acquired	146	263
Total Loans and Leases Held for Investment	27,588	30,373	31,186
Lease Financings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	130,154	134,739
Total Loans and Leases Held for Investment, Acquired	0	0
Total Loans and Leases Held for Investment	$ 130,154	$ 134,739	$ 128,796