Loans and Allowance for Loan and Lease Losses - TDRs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) loan	Dec. 31, 2014 USD ($) loan	Dec. 31, 2013 USD ($) loan
Troubled debt restructurings
Accruing loans that were classified as TDRs	$ 10,056	$ 6,511
Non-Accruing loans that were classified as TDRs	6,203	7,057
Total loans classified as TDRs	$ 16,259	$ 13,568
Number of TDRs | loan	44	33
Pre-Modification Outstanding Recorded Investment	$ 9,873	$ 4,436
Post-Modification Outstanding Recorded Investment	9,873	4,436
Troubled Debt Restructurings That Subsequently Defaulted
Commitments to lend to borrowers with restructured obligations	$ 300
Minimum
Troubled debt restructurings
Period of maturity date extensions granted	6 months
Maximum
Troubled debt restructurings
Period of maturity date extensions granted	10 years
Non-PCI Loans
Troubled debt restructurings
Accruing loans that were classified as TDRs	$ 8,619	6,251
Non-Accruing loans that were classified as TDRs	6,091	6,950
Total loans classified as TDRs	$ 14,710	$ 13,201
Number of TDRs | loan			16
Pre-Modification Outstanding Recorded Investment			$ 3,940
Post-Modification Outstanding Recorded Investment			$ 3,940
Troubled Debt Restructurings That Subsequently Defaulted
Number of TDRs | loan	1	2	5
Recorded Investment	$ 18	$ 233	$ 958
Non-PCI Loans | Real Estate Secured | Commercial real estate
Troubled debt restructurings
Accruing loans that were classified as TDRs	2,395	2,449
Non-Accruing loans that were classified as TDRs	435	78
Total loans classified as TDRs	$ 2,830	$ 2,527
Number of TDRs | loan	6	2	2
Pre-Modification Outstanding Recorded Investment	$ 1,102	$ 312	$ 339
Post-Modification Outstanding Recorded Investment	1,102	312	$ 339
Non-PCI Loans | Real Estate Secured | Construction and land
Troubled debt restructurings
Accruing loans that were classified as TDRs	1,171	1,109
Non-Accruing loans that were classified as TDRs	3,968	5,149
Total loans classified as TDRs	$ 5,139	$ 6,258
Number of TDRs | loan	1	4	1
Pre-Modification Outstanding Recorded Investment	$ 97	$ 811	$ 1,254
Post-Modification Outstanding Recorded Investment	97	811	$ 1,254
Non-PCI Loans | Real Estate Secured | Residential 1 to 4 family
Troubled debt restructurings
Accruing loans that were classified as TDRs	613	130
Non-Accruing loans that were classified as TDRs	81	130
Total loans classified as TDRs	$ 694	$ 260
Number of TDRs | loan	4	1	1
Pre-Modification Outstanding Recorded Investment	$ 753	$ 39	$ 139
Post-Modification Outstanding Recorded Investment	753	39	$ 139
Troubled Debt Restructurings That Subsequently Defaulted
Number of TDRs | loan			1
Recorded Investment			$ 97
Non-PCI Loans | Real Estate Secured | Farmland
Troubled debt restructurings
Accruing loans that were classified as TDRs	504	283
Non-Accruing loans that were classified as TDRs	82
Total loans classified as TDRs	$ 586	283
Number of TDRs | loan	3
Pre-Modification Outstanding Recorded Investment	$ 814
Post-Modification Outstanding Recorded Investment	814
Non-PCI Loans | Commercial | Commercial and industrial
Troubled debt restructurings
Accruing loans that were classified as TDRs	2,698	2,177
Non-Accruing loans that were classified as TDRs	1,515	1,593
Total loans classified as TDRs	$ 4,213	$ 3,770
Number of TDRs | loan	15	20	10
Pre-Modification Outstanding Recorded Investment	$ 3,414	$ 2,132	$ 2,141
Post-Modification Outstanding Recorded Investment	$ 3,414	$ 2,132	$ 2,141
Troubled Debt Restructurings That Subsequently Defaulted
Number of TDRs | loan	1	2	3
Recorded Investment	$ 18	$ 233	$ 843
Non-PCI Loans | Commercial | Agriculture
Troubled debt restructurings
Accruing loans that were classified as TDRs	1,124	34
Total loans classified as TDRs	$ 1,124	$ 34
Number of TDRs | loan	6	1	2
Pre-Modification Outstanding Recorded Investment	$ 2,085	$ 662	$ 67
Post-Modification Outstanding Recorded Investment	2,085	662	$ 67
Troubled Debt Restructurings That Subsequently Defaulted
Number of TDRs | loan			1
Recorded Investment			$ 18
Non-PCI Loans | Consumer
Troubled debt restructurings
Accruing loans that were classified as TDRs	114	69
Non-Accruing loans that were classified as TDRs	10
Total loans classified as TDRs	$ 124	$ 69
Number of TDRs | loan	2	1
Pre-Modification Outstanding Recorded Investment	$ 68	$ 73
Post-Modification Outstanding Recorded Investment	68	73
PCI loans
Troubled debt restructurings
Accruing loans that were classified as TDRs	1,437	260
Non-Accruing loans that were classified as TDRs	112	107
Total loans classified as TDRs	1,549	367
PCI loans | Real Estate Secured | Commercial real estate
Troubled debt restructurings
Accruing loans that were classified as TDRs	922	223
Non-Accruing loans that were classified as TDRs	46
Total loans classified as TDRs	$ 968	$ 223
Number of TDRs | loan	5	1
Pre-Modification Outstanding Recorded Investment	$ 993	$ 230
Post-Modification Outstanding Recorded Investment	993	230
PCI loans | Real Estate Secured | Construction and land
Troubled debt restructurings
Accruing loans that were classified as TDRs	54
Total loans classified as TDRs	$ 54
Number of TDRs | loan	1
Pre-Modification Outstanding Recorded Investment	$ 50
Post-Modification Outstanding Recorded Investment	50
PCI loans | Commercial | Commercial and industrial
Troubled debt restructurings
Accruing loans that were classified as TDRs	461	37
Non-Accruing loans that were classified as TDRs	66	107
Total loans classified as TDRs	$ 527	$ 144
Number of TDRs | loan	1	3
Pre-Modification Outstanding Recorded Investment	$ 497	$ 177
Post-Modification Outstanding Recorded Investment	$ 497	$ 177