Loans & Leases and Allowance for Credit Losses, Aging Analysis of Loan Portfolio by the Time Past Due (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	$ 104	$ 1,399	$ 606
60 to 89 Days Past Due	0	52	215
90 Days or More and Still Accruing	0	0	0
Nonaccrual	2,497	2,596	3,783
Total Past Due	2,601	4,047	4,604
Current	1,613,170	1,384,189	1,293,207
Total Loans	1,615,771	1,388,236	1,297,811
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	0	773	592
60 to 89 Days Past Due	0	0	0
90 Days or More and Still Accruing	0	0	0
Nonaccrual	0	0	176
Total Past Due	0	773	768
Current	473,505	406,741	400,858
Total Loans	473,505	407,514	401,626
Agricultural Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	0	607	0
60 to 89 Days Past Due	0	0	0
90 Days or More and Still Accruing	0	0	0
Nonaccrual	0	0	849
Total Past Due	0	607	849
Current	364,161	327,657	310,552
Total Loans	364,161	328,264	311,401
Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	0	0	0
60 to 89 Days Past Due	0	0	0
90 Days or More and Still Accruing	0	0	0
Nonaccrual	0	0	0
Total Past Due	0	0	0
Current	104,463	41,092	27,099
Total Loans	104,463	41,092	27,099
Residential 1st Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	0	0	0
60 to 89 Days Past Due	0	0	0
90 Days or More and Still Accruing	0	0	0
Nonaccrual	283	324	455
Total Past Due	283	324	455
Current	168,027	150,968	143,122
Total Loans	168,310	151,292	143,577
Home Equity Lines & Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	92	0	0
60 to 89 Days Past Due	0	52	121
90 Days or More and Still Accruing	0	0	0
Nonaccrual	575	406	243
Total Past Due	667	458	364
Current	32,616	35,019	36,796
Total Loans	33,283	35,477	37,160
Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	0	0	0
60 to 89 Days Past Due	0	0	0
90 Days or More and Still Accruing	0	0	0
Nonaccrual	25	35	99
Total Past Due	25	35	99
Current	237,496	256,379	221,470
Total Loans	237,521	256,414	221,569
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	0	0	0
60 to 89 Days Past Due	0	0	0
90 Days or More and Still Accruing	0	0	0
Nonaccrual	1,600	1,815	1,944
Total Past Due	1,600	1,815	1,944
Current	191,204	148,583	143,849
Total Loans	192,804	150,398	145,793
Consumer & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	12	19	14
60 to 89 Days Past Due	0	0	94
90 Days or More and Still Accruing	0	0	0
Nonaccrual	14	16	17
Total Past Due	26	35	125
Current	4,790	5,017	4,938
Total Loans	4,816	5,052	5,063
Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	0	0	0
60 to 89 Days Past Due	0	0	0
90 Days or More and Still Accruing	0	0	0
Nonaccrual	0	0	0
Total Past Due	0	0	0
Current	36,908	12,733	4,523
Total Loans	$ 36,908	$ 12,733	$ 4,523