Loans - (Impaired Loans - Average Recorded Investment and Interest Income Recognized) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Loans [Line Items]
Impaired Financing Receivable, Average Recorded Investment	$ 36,651	$ 38,647
Impaired Financing Receivable, Interest Income, Cash Basis Method	615	863
Commercial Loan [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	10,729	21,827
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	266	414
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	9,366	893
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	1	7
Agriculture [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,961	3,458
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		126
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	276	158
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	4
Commercial Construction [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	188
Multifamily [Member]
Loans [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	60
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	1
Owner-Occupied [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,221	1,018
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	83	51
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,230	1,166
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	27	40
Non Owner-Occupied [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	157
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,667	1,095
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	48	56
Total Commercial Real Estate [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,566	1,018
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	83	51
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,956	2,261
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	76	96
Sr Lien 1-4 Family Closed End [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	956	605
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	15	7
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,911	6,594
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	119	101
Jr Lien 1-4 Family Closed End [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	113
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,725	1,568
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	51	60
Residential Real Estate Segment [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,069	605
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	15	7
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	7,636	8,162
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	170	161
Consumer [Member]
Loans [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	92	265
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	1	1
Impaired Loans With No Related Allowance Recorded [Member] [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	16,324	26,908
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	363	598
Impaired Loans with Related Allowance Recorded [Member]
Loans [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	20,326	11,739
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	$ 252	$ 265

Loans [Line Items]

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- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524

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- Definition

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

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- Definition

Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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- Definition

Amount of interest income, recognized on cash basis, on financing receivables, for which there is no related allowance for credit losses and are recognized as impaired.

+ References

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- Definition

Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.

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- Definition

Amount of interest income on financing receivables, for which there is a related allowance for credit losses, recognized on a cash-basis method of accounting that the financing receivables were impaired.

+ References

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