Loans and Allowance for Loan Losses - Impaired non acquired and acquired loans - FASB 310-20 - (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	$ 35,079	$ 43,010
Recorded Investment With No Allowance	7,736	9,447
Gross Recorded Investment With Allowance	13,475	20,771
Total Recorded Investment	21,211	30,218
Related Allowance	1,337	1,607
Average Investment In Impaired Loans	25,715	28,651	$ 26,565
Interest Income Recognized	913	1,216	598
Non acquired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	14,464	18,447
Acquired non-credit impaired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	4,728	3,764
Commercial non-owner occupied real estate \| Construction and land development
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	7,394	9,931
Recorded Investment With No Allowance	1,074	1,004
Gross Recorded Investment With Allowance	1,959	5,276
Total Recorded Investment	3,033	6,280
Related Allowance	348	615
Average Investment In Impaired Loans	4,657	5,566	5,295
Interest Income Recognized	120	263	80
Commercial non-owner occupied real estate \| Other commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	2,417	2,909
Recorded Investment With No Allowance	223	233
Gross Recorded Investment With Allowance	583	1,219
Total Recorded Investment	806	1,452
Related Allowance	170	34
Average Investment In Impaired Loans	1,129	2,531	3,145
Interest Income Recognized	32	66	68
Commercial non-owner occupied real estate \| Non acquired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	1,250	1,274
Commercial non-owner occupied real estate \| Non acquired non-accrual loans \| Construction and land development
Loans and Allowance for Loan Losses
Nonaccrual loans	672	1,090
Commercial non-owner occupied real estate \| Non acquired non-accrual loans \| Other commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Nonaccrual loans	578	184
Commercial non-owner occupied real estate \| Acquired non-credit impaired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	232	37
Commercial non-owner occupied real estate \| Acquired non-credit impaired non-accrual loans \| Construction and land development
Loans and Allowance for Loan Losses
Nonaccrual loans	232	37
Commercial owner occupied real estate loan
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	10,118	11,516
Recorded Investment With No Allowance	3,976	4,134
Gross Recorded Investment With Allowance	2,269	3,591
Total Recorded Investment	6,245	7,725
Related Allowance	67	101
Average Investment In Impaired Loans	6,985	8,442	10,360
Interest Income Recognized	291	368	141
Commercial owner occupied real estate loan \| Non acquired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	2,189	3,056
Commercial owner occupied real estate loan \| Acquired non-credit impaired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	61	44
Consumer real estate \| Home equity loans
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	2,165	483
Recorded Investment With No Allowance	244	186
Gross Recorded Investment With Allowance	1,430	123
Total Recorded Investment	1,674	309
Related Allowance	40	3
Average Investment In Impaired Loans	992	170	15
Interest Income Recognized	61	10	1
Consumer real estate \| Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	7,090	9,001
Recorded Investment With No Allowance	2,120	3,505
Gross Recorded Investment With Allowance	3,553	4,044
Total Recorded Investment	5,673	7,549
Related Allowance	80	138
Average Investment In Impaired Loans	6,611	5,257	2,990
Interest Income Recognized	206	183	113
Consumer real estate \| Non acquired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	7,340	9,535
Consumer real estate \| Non acquired non-accrual loans \| Home equity loans
Loans and Allowance for Loan Losses
Nonaccrual loans	1,629	1,769
Consumer real estate \| Non acquired non-accrual loans \| Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Nonaccrual loans	5,711	7,766
Consumer real estate \| Acquired non-credit impaired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	3,048	2,079
Consumer real estate \| Acquired non-credit impaired non-accrual loans \| Home equity loans
Loans and Allowance for Loan Losses
Nonaccrual loans	1,643	1,103
Consumer real estate \| Acquired non-credit impaired non-accrual loans \| Consumer Owner Occupied Loans
Loans and Allowance for Loan Losses
Nonaccrual loans	1,405	976
Commercial and industrial
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	2,335	2,641
Recorded Investment With No Allowance		273
Gross Recorded Investment With Allowance	1,263	1,214
Total Recorded Investment	1,263	1,487
Related Allowance	386	279
Average Investment In Impaired Loans	1,375	1,198	657
Interest Income Recognized	52	61	27
Commercial and industrial \| Non acquired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	420	515
Commercial and industrial \| Acquired non-credit impaired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	1	1
Other income producing property
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	3,166	5,763
Recorded Investment With No Allowance	99	112
Gross Recorded Investment With Allowance	2,273	4,779
Total Recorded Investment	2,372	4,891
Related Allowance	242	422
Average Investment In Impaired Loans	3,632	5,195	4,073
Interest Income Recognized	145	245	163
Other income producing property \| Non acquired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	356	746
Other income producing property \| Acquired non-credit impaired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	145	168
Consumer
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	394	155
Gross Recorded Investment With Allowance	145	102
Total Recorded Investment	145	102
Related Allowance	4	3
Average Investment In Impaired Loans	123	81	30
Interest Income Recognized	6	4	$ 5
Consumer \| Non acquired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	930	659
Consumer \| Acquired non-credit impaired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	1,241	1,435
Other loans
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance		611
Gross Recorded Investment With Allowance		423
Total Recorded Investment		423
Related Allowance		12
Average Investment In Impaired Loans	$ 211	211
Interest Income Recognized		16
Restructured loans \| ASC Topic 31020 Loans \| Minimum
Loans and Allowance for Loan Losses
Number of months generally required to return to accruing status	6 months
Restructured loans \| Non acquired non-accrual loans
Loans and Allowance for Loan Losses
Nonaccrual loans	$ 1,979	$ 2,662

Nonaccrual TDRs are returned to accruing status after demonstrated sustained repayment performance.

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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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Amount of allowance for credit losses related to recorded investment.

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Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

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