Loans and Allowance for Loan and Lease Losses - Impaired Loans (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016 USD ($) loan	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) loan	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Investment in impaired loans
Interest loss related to rate concessions on certain TDRs	$ 200	$ 200	$ 300	$ 400
Non-PCI Loans
Investment in impaired loans
Recorded investment without related allowance	12,552		12,552		$ 13,524
Recorded investment with related allowance	2,837		2,837		2,779
Unpaid principal balance without related allowance	18,759		18,759		20,006
Unpaid principal balance with related allowance	2,918		2,918		3,037
Specific Allowance for Impaired Loans	309		309		254
Average recorded investment without related allowance	13,471	12,040	13,579	11,531
Average recorded investment with related allowance	2,916	6,093	2,781	6,116
Interest income recognized without related allowance	118	80	243	180
Interest income recognized with related allowance	28	16	64	29
Recorded Investment	15,389		15,389		16,303
Unpaid Principal Balance	21,677		21,677		23,043
Average Recorded Investment	16,387	18,133	16,360	17,647
Interest Income Recognized	146	96	307	209
PCI loans
Investment in impaired loans
Recorded investment without related allowance	6,883		6,883		7,531
Recorded investment with related allowance	1,134		1,134		1,244
Unpaid principal balance without related allowance	8,756		8,756		9,840
Unpaid principal balance with related allowance	1,137		1,137		1,267
Specific Allowance for Impaired Loans	77		77		79
Average recorded investment without related allowance	7,175	7,942	7,301	8,114
Average recorded investment with related allowance	1,155	1,856	1,176	1,865
Interest income recognized without related allowance	420	217	615	845
Interest income recognized with related allowance	19	38	40	87
Recorded Investment	8,017		8,017		8,775
Unpaid Principal Balance	9,893		9,893		11,107
Average Recorded Investment	8,330	9,798	8,477	9,979
Interest Income Recognized	$ 439	255	$ 655	932
Residential 1 to 4 family
Foreclosures
Number of foreclosures \| loan	0		0
Foreclosed assets	$ 0		$ 0
Home equity lines of credit
Foreclosures
Number of foreclosures \| loan	2		2
Foreclosed assets	$ 100		$ 100
Real Estate Secured \| Commercial real estate \| Non-PCI Loans
Investment in impaired loans
Recorded investment without related allowance	2,429		2,429		3,855
Recorded investment with related allowance	283		283		435
Unpaid principal balance without related allowance	3,531		3,531		5,328
Unpaid principal balance with related allowance	303		303		665
Specific Allowance for Impaired Loans	36		36		59
Average recorded investment without related allowance	3,179	4,263	3,451	4,211
Average recorded investment with related allowance	286	476	289	483
Interest income recognized without related allowance	31	38	62	75
Interest income recognized with related allowance	4		8
Real Estate Secured \| Commercial real estate \| PCI loans
Investment in impaired loans
Recorded investment without related allowance	5,116		5,116		5,156
Recorded investment with related allowance	518		518		529
Unpaid principal balance without related allowance	6,486		6,486		6,601
Unpaid principal balance with related allowance	520		520		538
Specific Allowance for Impaired Loans	40		40		41
Average recorded investment without related allowance	5,126	4,951	5,136	5,073
Average recorded investment with related allowance	521	806	524	800
Interest income recognized without related allowance	124	125	246	665
Interest income recognized with related allowance	9	19	19	49
Real Estate Secured \| Residential 1 to 4 family \| Non-PCI Loans
Investment in impaired loans
Recorded investment without related allowance	274		274		694
Unpaid principal balance without related allowance	426		426		860
Average recorded investment without related allowance	278	680	416	540
Interest income recognized without related allowance	5	1	10	1
Real Estate Secured \| Residential 1 to 4 family \| PCI loans
Investment in impaired loans
Recorded investment without related allowance	121		121		573
Unpaid principal balance without related allowance	196		196		875
Average recorded investment without related allowance	349	449	423	450
Average recorded investment with related allowance		115		114
Interest income recognized without related allowance	231	13	249	24
Interest income recognized with related allowance		3		6
Real Estate Secured \| Construction and land \| Non-PCI Loans
Investment in impaired loans
Recorded investment without related allowance	4,838		4,838		5,138
Unpaid principal balance without related allowance	9,438		9,438		9,615
Average recorded investment without related allowance	5,067	1,496	5,091	1,570
Interest income recognized without related allowance	19	24	42	47
Real Estate Secured \| Construction and land \| PCI loans
Investment in impaired loans
Recorded investment without related allowance	59		59		53
Recorded investment with related allowance	200		200		229
Unpaid principal balance without related allowance	145		145		152
Unpaid principal balance with related allowance	200		200		230
Specific Allowance for Impaired Loans	5		5		5
Average recorded investment without related allowance	58	555	56	556
Average recorded investment with related allowance	206	274	213	280
Interest income recognized without related allowance	9	20	18	38
Interest income recognized with related allowance	3	5	7	10
Real Estate Secured \| Farmland \| Non-PCI Loans
Investment in impaired loans
Recorded investment without related allowance	401		401		587
Unpaid principal balance without related allowance	406		406		588
Average recorded investment without related allowance	673	725	644	578
Interest income recognized without related allowance	11	3	23	19
Real Estate Secured \| Land \| Non-PCI Loans
Investment in impaired loans
Average recorded investment with related allowance		4,637		4,666
Real Estate Secured \| Home equity lines of credit \| Non-PCI Loans
Investment in impaired loans
Recorded investment without related allowance	84		84		85
Unpaid principal balance without related allowance	86		86		86
Average recorded investment without related allowance	65	66	72	130
Commercial \| Agriculture \| Non-PCI Loans
Investment in impaired loans
Recorded investment without related allowance	1,369		1,369		724
Recorded investment with related allowance	363		363		400
Unpaid principal balance without related allowance	1,459		1,459		815
Unpaid principal balance with related allowance	369		369		400
Specific Allowance for Impaired Loans	88		88		39
Average recorded investment without related allowance	1,112	657	983	678
Average recorded investment with related allowance	373		382
Interest income recognized without related allowance	12	1	21	1
Interest income recognized with related allowance			3
Commercial \| Agriculture \| PCI loans
Investment in impaired loans
Recorded investment without related allowance	1,460		1,460		1,452
Unpaid principal balance without related allowance	1,500		1,500		1,500
Average recorded investment without related allowance	1,457	1,435	1,455	1,433
Interest income recognized without related allowance	30	29	57	58
Commercial \| Commercial and industrial \| Non-PCI Loans
Investment in impaired loans
Recorded investment without related allowance	2,931		2,931		2,295
Recorded investment with related allowance	2,191		2,191		1,944
Unpaid principal balance without related allowance	3,171		3,171		2,510
Unpaid principal balance with related allowance	2,246		2,246		1,972
Specific Allowance for Impaired Loans	185		185		156
Average recorded investment without related allowance	2,913	3,993	2,750	3,680
Average recorded investment with related allowance	2,257	980	2,110	967
Interest income recognized without related allowance	38	12	82	34
Interest income recognized with related allowance	24	16	53	29
Commercial \| Commercial and industrial \| PCI loans
Investment in impaired loans
Recorded investment without related allowance	127		127		297
Recorded investment with related allowance	416		416		486
Unpaid principal balance without related allowance	429		429		712
Unpaid principal balance with related allowance	417		417		499
Specific Allowance for Impaired Loans	32		32		33
Average recorded investment without related allowance	185	552	231	602
Average recorded investment with related allowance	428	661	439	671
Interest income recognized without related allowance	26	30	45	60
Interest income recognized with related allowance	7	11	14	22
Consumer \| Non-PCI Loans
Investment in impaired loans
Recorded investment without related allowance	226		226		146
Unpaid principal balance without related allowance	242		242		$ 204
Average recorded investment without related allowance	184	160	172	144
Interest income recognized without related allowance	$ 2	$ 1	$ 3	$ 3

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Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

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