Allowance for Loan and Lease Losses (Schedule of Activity in Allowance for Loan and Lease Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Allowance for credit losses:
Beginning of year	$ 11,248		$ 11,677
Charge-offs	(1,060)		(4,215)
Recoveries	530		3,436
Provision			350
End of year	10,718		11,248
Reserves:
Specific	5,269		5,448
General	5,449		5,800
Financing Receivable, Allowance for Credit Losses, Total	10,718		11,248
Loans evaluated for impairment:
Individually	34,368		36,424
Collectively	1,031,476		934,229
Total Loans	1,065,844		970,653
Real Estate [Member]
Allowance for credit losses:
Beginning of year	6,243		5,544
Charge-offs	(627)		(1,629)
Recoveries	198		1,913
Provision	151		415
End of year	5,965		6,243
Reserves:
Specific	3,834		3,864
General	2,131		2,379
Financing Receivable, Allowance for Credit Losses, Total	5,965		6,243
Loans evaluated for impairment:
Individually	28,382		30,620
Collectively	677,821		673,610
Total Loans	706,203		704,230
Agricultural [Member]
Allowance for credit losses:
Beginning of year	986		978
Charge-offs			(124)
Recoveries	1		6
Provision	(336)		126
End of year	651		986
Reserves:
Specific
General	651		986
Financing Receivable, Allowance for Credit Losses, Total	651		986
Loans evaluated for impairment:
Individually	487
Collectively	28,014		27,746
Total Loans	28,501		27,746
Commercial and Industrial [Member]
Allowance for credit losses:
Beginning of year	1,944	[1]	3,787	[1]
Charge-offs	(20)	[1]	(625)	[1]
Recoveries	81	[1]	801	[1]
Provision	248	[1]	(2,019)	[1]
End of year	2,253	[1]	1,944	[1]
Reserves:
Specific	895	[1]	916	[1]
General	1,358	[1]	1,028	[1]
Financing Receivable, Allowance for Credit Losses, Total	2,253	[1]	1,944	[1]
Loans evaluated for impairment:
Individually	2,990	[1]	2,916	[1]
Collectively	310,706	[1]	216,876	[1]
Total Loans	313,696	[1]	219,792	[1]
Consumer [Member]
Allowance for credit losses:
Beginning of year	1,765		1,117
Charge-offs	(413)		(1,837)
Recoveries	250		716
Provision	(125)		1,769
End of year	1,477		1,765
Reserves:
Specific	540		668
General	937		1,097
Financing Receivable, Allowance for Credit Losses, Total	1,477		1,765
Loans evaluated for impairment:
Individually	2,509		2,888
Collectively	14,935		15,997
Total Loans	17,444		18,885
Unallocated [Member]
Allowance for credit losses:
Beginning of year	310		251
Charge-offs
Recoveries
Provision	62		59
End of year	372		310
Reserves:
Specific
General	372		310
Financing Receivable, Allowance for Credit Losses, Total	372		310
Loans evaluated for impairment:
Individually
Collectively
Total Loans

[1] Includes mortgage warehouse lines