Loans and Allowance for Loan and Lease Losses - Aging (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Aging of loans held for investment
Current	$ 1,239,201	$ 1,182,868
30-59	66	56
60-89	195	24
Non-Accruing	7,818	10,535
Total	1,247,280	1,193,483
Non-PCI Loans
Aging of loans held for investment
Current	1,230,561	1,172,944
30-59	66	56
60-89	195	24
Non-Accruing	7,683	10,159
Total	1,238,505	1,183,183
Non-PCI Loans | Real Estate Secured | Commercial real estate
Aging of loans held for investment
Current	571,665	581,971
Non-Accruing	1,894	2,085
Total	573,559	584,056
Non-PCI Loans | Real Estate Secured | Residential 1 to 4 family
Aging of loans held for investment
Current	165,176	126,516
Non-Accruing	80	124
Total	165,256	126,640
Non-PCI Loans | Real Estate Secured | Farmland
Aging of loans held for investment
Current	120,483	96,708
Non-Accruing	83
Total	120,566	96,708
Non-PCI Loans | Real Estate Secured | Multi-family residential
Aging of loans held for investment
Current	79,381	78,645
Total	79,381	78,645
Non-PCI Loans | Real Estate Secured | Construction and land
Aging of loans held for investment
Current	31,419	38,572
Non-Accruing	3,968	5,237
Total	35,387	43,809
Non-PCI Loans | Real Estate Secured | Home equity lines of credit
Aging of loans held for investment
Current	31,303	37,994
Non-Accruing	84	258
Total	31,387	38,252
Non-PCI Loans | Commercial | Commercial and industrial
Aging of loans held for investment
Current	162,223	151,656
30-59	66
60-89	195	21
Non-Accruing	1,541	1,726
Total	164,025	153,403
Non-PCI Loans | Commercial | Agriculture
Aging of loans held for investment
Current	62,911	52,992
Non-Accruing		686
Total	62,911	53,678
Non-PCI Loans | Commercial | Other
Aging of loans held for investment
Current		14
Total		14
Non-PCI Loans | Consumer
Aging of loans held for investment
Current	6,000	7,876
30-59		56
60-89		3
Non-Accruing	33	43
Total	6,033	7,978
PCI loans
Aging of loans held for investment
Current	8,640	9,924
Non-Accruing	135	376
Total	8,775	10,300
PCI loans | Real Estate Secured | Commercial real estate
Aging of loans held for investment
Current	5,639	4,416
Non-Accruing	46
Total	5,685	4,416
PCI loans | Real Estate Secured | Residential 1 to 4 family
Aging of loans held for investment
Current	573	561
Total	573	561
PCI loans | Real Estate Secured | Farmland
Aging of loans held for investment
Current		1,665
Total		1,665
PCI loans | Real Estate Secured | Construction and land
Aging of loans held for investment
Current	282	851
Total	282	851
PCI loans | Commercial | Commercial and industrial
Aging of loans held for investment
Current	694	1,008
Non-Accruing	89	376
Total	783	1,384
PCI loans | Commercial | Agriculture
Aging of loans held for investment
Current	1,452	1,423
Total	1,452	1,423
Current
Aging of loans held for investment
Non-Accruing	6,400	8,500
30 to 59 Days Past Due
Aging of loans held for investment
Non-Accruing	28	200
60 to 89 Days Past Due
Aging of loans held for investment
Non-Accruing	26	800
90+ Days Past Due
Aging of loans held for investment
Non-Accruing	$ 1,400	$ 1,000