Loans and Leases - Summary of Major Loan and Lease Categories (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	$ 1,910,105	$ 1,883,563
Total Loans and Leases Held for Investment, Acquired	273,151	295,450
Total Loans and Leases Held for Investment	2,183,256	2,179,013	$ 2,043,840
Unearned Lease Income, Originated	(13,793)	(13,829)
Unearned Lease Income, Acquired	0	0
Unearned lease income, included in the above table	(13,793)	(13,829)
Net deferred costs, Originated	4,568	4,244
Net deferred costs, Acquired	0	0
Net deferred costs, included in the above table	4,568	4,244
Overdraft Deposits, Originated	58	35
Overdraft Deposits, Acquired	0	0
Overdraft deposits included in the above table	58	35
Commercial, Financial and Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	486,112	479,980
Total Loans and Leases Held for Investment, Acquired	21,207	24,535
Total Loans and Leases Held for Investment	507,319	504,515	491,279
Real Estate-Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	760,492	759,342
Total Loans and Leases Held for Investment, Acquired	120,928	126,550
Total Loans and Leases Held for Investment	881,420	885,892
Real Estate-Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	90,567	91,904
Total Loans and Leases Held for Investment, Acquired	2,004	4,637
Total Loans and Leases Held for Investment	92,571	96,541
Real Estate-Residential Secured for Business Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	103,591	94,280
Total Loans and Leases Held for Investment, Acquired	114,673	124,503
Total Loans and Leases Held for Investment	218,264	218,783	183,295
Real Estate-Residential Secured for Personal Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	185,482	177,850
Total Loans and Leases Held for Investment, Acquired	3,227	3,305
Total Loans and Leases Held for Investment	188,709	181,155
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	129,907	125,361
Total Loans and Leases Held for Investment, Acquired	10,831	11,594
Total Loans and Leases Held for Investment	140,738	136,955
Loans to Individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	28,140	29,406
Total Loans and Leases Held for Investment, Acquired	281	326
Total Loans and Leases Held for Investment	28,421	29,732	29,991
Lease Financings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases Held for Investment, Originated	125,814	125,440
Total Loans and Leases Held for Investment, Acquired	0	0
Total Loans and Leases Held for Investment	$ 125,814	$ 125,440	$ 115,958