Loans and Leases - Summary of Major Loan and Lease Categories (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	$ 1,756,503	$ 1,626,625
Total Loans and Leases Held for Investment, Acquired	341,304
Total Loans and Leases Held for Investment	2,097,807	1,626,625	$ 1,597,736
Unearned Lease Income, Originated	(13,822)	(14,131)
Unearned Lease Income, Acquired	0
Unearned lease income, included in the above table	(13,822)
Net deferred costs, Originated	3,700	3,218
Net deferred costs, Acquired	0
Net deferred costs, included in the above table	3,700
Overdraft Deposits, Originated	76	50
Overdraft Deposits, Acquired	0
Overdraft deposits included in the above table	76
Commercial, Financial and Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	455,469	457,827
Total Loans and Leases Held for Investment, Acquired	27,873
Total Loans and Leases Held for Investment	483,342	457,827	438,556
Real Estate-Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	692,284	628,478
Total Loans and Leases Held for Investment, Acquired	131,019
Total Loans and Leases Held for Investment	823,303	628,478
Real Estate-Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	89,856	79,887
Total Loans and Leases Held for Investment, Acquired	27,359
Total Loans and Leases Held for Investment	117,215	79,887
Real Estate-Residential Secured for Business Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	65,371	36,932
Total Loans and Leases Held for Investment, Acquired	138,593
Total Loans and Leases Held for Investment	203,964	36,932	35,367
Real Estate-Residential Secured for Personal Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	178,387	166,850
Total Loans and Leases Held for Investment, Acquired	4,199
Total Loans and Leases Held for Investment	182,586	166,850
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	120,677	108,250
Total Loans and Leases Held for Investment, Acquired	11,919
Total Loans and Leases Held for Investment	132,596	108,250
Loans to Individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	29,575	29,941
Total Loans and Leases Held for Investment, Acquired	342
Total Loans and Leases Held for Investment	29,917	29,941	30,144
Lease Financings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	124,884	118,460
Total Loans and Leases Held for Investment, Acquired	0
Total Loans and Leases Held for Investment	$ 124,884	$ 118,460	$ 111,952