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Loans - Impaired Loans - Recorded Investment, Unpaid Principal Balance and Related Allowance (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Recorded Investment
With no related allowance recorded	$ 24,770	$ 35,011
With an allowance recorded	362	875
Total impaired loans	25,132	35,886
Unpaid Principal Balance
With no related allowance recorded	29,337	41,003
With an allowance recorded	414	997
Total impaired loans	29,751	42,000
Related Allowance
With an allowance recorded	25	278
Commercial
Recorded Investment
With no related allowance recorded	528	1,500
With an allowance recorded	4
Unpaid Principal Balance
With no related allowance recorded	609	2,114
With an allowance recorded	9
Related Allowance
With an allowance recorded	5
Real estate - commercial | Owner occupied general purpose
Recorded Investment
With no related allowance recorded	2,589	7,125
Unpaid Principal Balance
With no related allowance recorded	3,483	7,870
Real estate - commercial | Owner occupied special purpose
Recorded Investment
With no related allowance recorded	778	1,798
Unpaid Principal Balance
With no related allowance recorded	875	1,941
Real estate - commercial | Non-owner occupied general purpose
Recorded Investment
With no related allowance recorded	335	4,831
With an allowance recorded		76
Unpaid Principal Balance
With no related allowance recorded	566	5,653
With an allowance recorded		76
Related Allowance
With an allowance recorded		21
Real estate - commercial | Non-owner occupied special purpose
Recorded Investment
With no related allowance recorded		1,423
Unpaid Principal Balance
With no related allowance recorded		1,930
Real estate - commercial | Farm
Recorded Investment
With no related allowance recorded	1,272
Unpaid Principal Balance
With no related allowance recorded	1,338
Real estate - construction | Homebuilder
Recorded Investment
With no related allowance recorded		1,791
Unpaid Principal Balance
With no related allowance recorded		1,791
Real estate - construction | Commercial speculative
Recorded Investment
With no related allowance recorded	3,561
Unpaid Principal Balance
With no related allowance recorded	3,561
Real estate - construction | All other
Recorded Investment
With no related allowance recorded	242	291
With an allowance recorded		270
Unpaid Principal Balance
With no related allowance recorded	288	323
With an allowance recorded		306
Related Allowance
With an allowance recorded		98
Real estate - residential | Investor
Recorded Investment
With no related allowance recorded	1,504	2,595
With an allowance recorded		135
Unpaid Principal Balance
With no related allowance recorded	1,820	3,024
With an allowance recorded		145
Related Allowance
With an allowance recorded		24
Real estate - residential | Owner occupied
Recorded Investment
With no related allowance recorded	11,199	11,419
With an allowance recorded		23
Unpaid Principal Balance
With no related allowance recorded	12,729	12,816
With an allowance recorded		65
Related Allowance
With an allowance recorded		38
Real estate - residential | Revolving and junior liens
Recorded Investment
With no related allowance recorded	2,762	2,238
With an allowance recorded	358	371
Unpaid Principal Balance
With no related allowance recorded	4,068	3,541
With an allowance recorded	405	405
Related Allowance
With an allowance recorded	$ 20	$ 97

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