Loans and Leases - Summary of Major Loan and Lease Categories (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	$ 2,651,013	$ 2,390,832
Total Loans and Leases Held for Investment, Acquired	690,903	895,054
Total Loans and Leases Held for Investment	3,341,916	3,285,886	$ 2,183,256
Unearned Lease Income, Originated	(15,524)	(15,970)
Unearned Lease Income, Acquired	0	0
Unearned lease income, included in the above table	(15,524)	(15,970)
Net deferred costs, Originated	4,418	4,503
Net deferred costs, Acquired	0	0
Net deferred costs, included in the above table	4,418	4,503
Overdraft Deposits, Originated	73	84
Overdraft Deposits, Acquired	0	0
Overdraft deposits included in the above table	73	84
Commercial, Financial and Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	750,342	663,221
Total Loans and Leases Held for Investment, Acquired	90,629	160,045
Total Loans and Leases Held for Investment	840,971	823,266	507,319
Real Estate-Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	1,013,978	909,581
Total Loans and Leases Held for Investment, Acquired	389,690	465,368
Total Loans and Leases Held for Investment	1,403,668	1,374,949
Real Estate-Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	170,178	142,891
Total Loans and Leases Held for Investment, Acquired	11,409	31,953
Total Loans and Leases Held for Investment	181,587	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	180,830	151,931
Total Loans and Leases Held for Investment, Acquired	111,402	142,137
Total Loans and Leases Held for Investment	292,232	294,068	218,264
Real Estate Residential Secured For Personal Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	220,543	210,377
Total Loans and Leases Held for Investment, Acquired	74,889	80,431
Total Loans and Leases Held for Investment	295,432	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	154,363	147,982
Total Loans and Leases Held for Investment, Acquired	12,736	14,857
Total Loans and Leases Held for Investment	167,099	162,839
Loans to Individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	27,915	30,110
Total Loans and Leases Held for Investment, Acquired	148	263
Total Loans and Leases Held for Investment	28,063	30,373	28,421
Lease Financings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	132,864	134,739
Total Loans and Leases Held for Investment, Acquired	0	0
Total Loans and Leases Held for Investment	$ 132,864	$ 134,739	$ 125,814