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Loans - Impaired Loans - Recorded Investment, Unpaid Principal Balance and Related Allowance (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Recorded Investment
With no related allowance recorded	$ 20,725	$ 35,011
With an allowance recorded	161	875
Total impaired loans	20,886	35,886
Unpaid Principal Balance
With no related allowance recorded	24,718	41,003
With an allowance recorded	166	997
Total impaired loans	24,884	42,000
Related Allowance
With an allowance recorded	34	278
Commercial
Recorded Investment
With no related allowance recorded	70	1,500
With an allowance recorded	3
Unpaid Principal Balance
With no related allowance recorded	149	2,114
With an allowance recorded	8
Related Allowance
With an allowance recorded	3
Real estate - commercial | Owner occupied general purpose
Recorded Investment
With no related allowance recorded	2,314	7,125
Unpaid Principal Balance
With no related allowance recorded	3,004	7,870
Real estate - commercial | Owner occupied special purpose
Recorded Investment
With no related allowance recorded	763	1,798
Unpaid Principal Balance
With no related allowance recorded	871	1,941
Real estate - commercial | Non-owner occupied general purpose
Recorded Investment
With no related allowance recorded	1,047	4,831
With an allowance recorded		76
Unpaid Principal Balance
With no related allowance recorded	1,065	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	83
Unpaid Principal Balance
With no related allowance recorded	86
Real estate - construction | All other
Recorded Investment
With no related allowance recorded		291
With an allowance recorded		270
Unpaid Principal Balance
With no related allowance recorded		323
With an allowance recorded		306
Related Allowance
With an allowance recorded		98
Real estate - residential | Investor
Recorded Investment
With no related allowance recorded	1,906	2,595
With an allowance recorded		135
Unpaid Principal Balance
With no related allowance recorded	2,259	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	10,539	11,419
With an allowance recorded	112	23
Unpaid Principal Balance
With no related allowance recorded	11,999	12,816
With an allowance recorded	112	65
Related Allowance
With an allowance recorded	31	38
Real estate - residential | Revolving and junior liens
Recorded Investment
With no related allowance recorded	2,731	2,238
With an allowance recorded	46	371
Unpaid Principal Balance
With no related allowance recorded	3,947	3,541
With an allowance recorded	$ 46	405
Related Allowance
With an allowance recorded		$ 97

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