Loans and ALLL (Summary of information pertaining to TDRs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014 loan	Sep. 30, 2013 loan	Sep. 30, 2014 loan	Sep. 30, 2013 loan
Financing Receivable, Modifications [Line Items]
Number of Loans	7	22	29	45
Pre-Modification Recorded Investment	$ 266	$ 1,587	$ 1,499	$ 6,310
Post-Modification Recorded Investment	266	1,587	1,499	6,097
Commercial other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2	3	7	10
Pre-Modification Recorded Investment	23	159	386	3,313
Post-Modification Recorded Investment	23	159	386	3,116
Agricultural other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	1	1	2
Pre-Modification Recorded Investment	49	198	49	332
Post-Modification Recorded Investment	49	198	49	332
Total residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	3	16	17	31
Pre-Modification Recorded Investment	184	1,196	1,046	2,631
Post-Modification Recorded Investment	184	1,196	1,046	2,615
Residential real estate senior liens [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2	15	14	30
Pre-Modification Recorded Investment	144	1,176	805	2,611
Post-Modification Recorded Investment	144	1,176	805	2,595
Residential real estate junior liens [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	1	2	1
Pre-Modification Recorded Investment	40	20	81	20
Post-Modification Recorded Investment	40	20	81	20
Residential real estate home equity lines of credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	0	1	0
Pre-Modification Recorded Investment	0	0	160	0
Post-Modification Recorded Investment	0	0	160	0
Consumer unsecured [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	2	4	2
Pre-Modification Recorded Investment	10	34	18	34
Post-Modification Recorded Investment	10	34	18	34
Below Market Interest Rate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	3	15	13	26
Pre-Modification Recorded Investment	33	1,297	651	3,413
Below Market Interest Rate [Member] | Commercial other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2	3	6	6
Pre-Modification Recorded Investment	23	159	378	1,517
Below Market Interest Rate [Member] | Agricultural other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	1	0	2
Pre-Modification Recorded Investment	0	198	0	332
Below Market Interest Rate [Member] | Total residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	10	4	17
Pre-Modification Recorded Investment	0	924	258	1,548
Below Market Interest Rate [Member] | Residential real estate senior liens [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	10	3	17
Pre-Modification Recorded Investment	0	924	98	1,548
Below Market Interest Rate [Member] | Residential real estate junior liens [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	0	0	0
Pre-Modification Recorded Investment	0	0	0	0
Below Market Interest Rate [Member] | Residential real estate home equity lines of credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	0	1	0
Pre-Modification Recorded Investment	0	0	160	0
Below Market Interest Rate [Member] | Consumer unsecured [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	1	3	1
Pre-Modification Recorded Investment	10	16	15	16
Below Market Interest Rate and Extension of Amortization Period [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	4	7	16	19
Pre-Modification Recorded Investment	233	290	848	2,897
Below Market Interest Rate and Extension of Amortization Period [Member] | Commercial other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	0	1	4
Pre-Modification Recorded Investment	0	0	8	1,796
Below Market Interest Rate and Extension of Amortization Period [Member] | Agricultural other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	0	1	0
Pre-Modification Recorded Investment	49	0	49	0
Below Market Interest Rate and Extension of Amortization Period [Member] | Total residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	3	6	13	14
Pre-Modification Recorded Investment	184	272	788	1,083
Below Market Interest Rate and Extension of Amortization Period [Member] | Residential real estate senior liens [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2	5	11	13
Pre-Modification Recorded Investment	144	252	707	1,063
Below Market Interest Rate and Extension of Amortization Period [Member] | Residential real estate junior liens [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	1	2	1
Pre-Modification Recorded Investment	40	20	81	20
Below Market Interest Rate and Extension of Amortization Period [Member] | Residential real estate home equity lines of credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	0	0	0
Pre-Modification Recorded Investment	0	0	0	0
Below Market Interest Rate and Extension of Amortization Period [Member] | Consumer unsecured [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	1	1	1
Pre-Modification Recorded Investment	$ 0	$ 18	$ 3	$ 18