Loans and Leases - Reserve for Loan and Lease Losses and Recorded Investment in Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Reserve for loan and lease losses:
Ending balance: individually evaluated for impairment	$ 341		$ 1,004
Ending balance: collectively evaluated for impairment	16,103		19,930
Ending balance: acquired credit impaired loans evaluated for impairment	8
Total ending balance	16,452	$ 17,628	20,934	$ 20,662
Loans and leases held for investment:
Ending balance: individually evaluated for impairment	46,474		53,652
Ending balance: collectively evaluated for impairment	1,863,631		1,612,303
Acquired non-credit impaired loans	271,884		376,254
Acquired credit impaired loans	1,267		1,631
Total Loans and Leases Held for Investment	2,183,256	2,179,013	2,043,840
Commercial, Financial and Agricultural [Member]
Reserve for loan and lease losses:
Ending balance: individually evaluated for impairment	151		1,004
Ending balance: collectively evaluated for impairment	5,479		5,708
Ending balance: acquired credit impaired loans evaluated for impairment	0
Total ending balance	5,630	6,418	6,712	6,920
Loans and leases held for investment:
Ending balance: individually evaluated for impairment	12,977		15,124
Ending balance: collectively evaluated for impairment	473,135		446,366
Acquired non-credit impaired loans	21,207		29,418
Acquired credit impaired loans	0		371
Total Loans and Leases Held for Investment	507,319	504,515	491,279
Real Estate-Commercial and Construction [Member]
Reserve for loan and lease losses:
Ending balance: individually evaluated for impairment	140		0
Ending balance: collectively evaluated for impairment	6,323		9,648
Ending balance: acquired credit impaired loans evaluated for impairment	8
Total ending balance	6,471	6,572	9,648	8,943
Loans and leases held for investment:
Ending balance: individually evaluated for impairment	29,375		34,380
Ending balance: collectively evaluated for impairment	821,684		700,581
Acquired non-credit impaired loans	122,415		189,225
Acquired credit impaired loans	517		578
Total Loans and Leases Held for Investment	973,991		924,764
Real Estate-Residential Secured for Business Purpose [Member]
Reserve for loan and lease losses:
Ending balance: individually evaluated for impairment	20		0
Ending balance: collectively evaluated for impairment	727		668
Ending balance: acquired credit impaired loans evaluated for impairment	0
Total ending balance	747	763	668	763
Loans and leases held for investment:
Ending balance: individually evaluated for impairment	3,618		3,239
Ending balance: collectively evaluated for impairment	99,973		38,658
Acquired non-credit impaired loans	113,923		140,779
Acquired credit impaired loans	750		619
Total Loans and Leases Held for Investment	218,264	218,783	183,295
Real Estate-Residential and Home Equity Secured for Personal Purpose [Member]
Reserve for loan and lease losses:
Ending balance: individually evaluated for impairment	30		0
Ending balance: collectively evaluated for impairment	1,282		1,128
Ending balance: acquired credit impaired loans evaluated for impairment	0
Total ending balance	1,312	1,575	1,128	1,124
Loans and leases held for investment:
Ending balance: individually evaluated for impairment	504		909
Ending balance: collectively evaluated for impairment	314,885		281,120
Acquired non-credit impaired loans	14,058		16,461
Acquired credit impaired loans	0		63
Total Loans and Leases Held for Investment	329,447		298,553
Loans to Individuals [Member]
Reserve for loan and lease losses:
Ending balance: individually evaluated for impairment	0		0
Ending balance: collectively evaluated for impairment	356		365
Ending balance: acquired credit impaired loans evaluated for impairment	0
Total ending balance	356	346	365	360
Loans and leases held for investment:
Ending balance: individually evaluated for impairment	0		0
Ending balance: collectively evaluated for impairment	28,140		29,620
Acquired non-credit impaired loans	281		371
Acquired credit impaired loans	0		0
Total Loans and Leases Held for Investment	28,421	29,732	29,991
Lease Financings [Member]
Reserve for loan and lease losses:
Ending balance: individually evaluated for impairment	0		0
Ending balance: collectively evaluated for impairment	922		1,013
Ending balance: acquired credit impaired loans evaluated for impairment	0
Total ending balance	922	1,042	1,013	985
Loans and leases held for investment:
Ending balance: individually evaluated for impairment	0		0
Ending balance: collectively evaluated for impairment	125,814		115,958
Acquired non-credit impaired loans	0		0
Acquired credit impaired loans	0		0
Total Loans and Leases Held for Investment	125,814	125,440	115,958
Unallocated Financing Receivables [Member]
Reserve for loan and lease losses:
Ending balance: collectively evaluated for impairment	1,014		1,400
Ending balance: acquired credit impaired loans evaluated for impairment	0
Total ending balance	$ 1,014	$ 912	$ 1,400	$ 1,567