Allowance for Loan and Lease Losses (Details 6) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Orginated Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	$ 1,455,601	$ 1,336,840
Orginated Loans and Leases | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	1,370,533	1,235,415
Orginated Loans and Leases | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	43,099	56,342
Orginated Loans and Leases | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	41,969	45,083
Orginated Loans and Leases | Commercial and Industrial Other
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	497,191	446,876
Orginated Loans and Leases | Commercial and Industrial Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	467,831	410,255
Orginated Loans and Leases | Commercial and Industrial Other | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	19,358	25,308
Orginated Loans and Leases | Commercial and Industrial Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	10,002	11,313
Orginated Loans and Leases | Commercial and Industrial - Agriculture
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	59,722	77,777
Orginated Loans and Leases | Commercial and Industrial - Agriculture | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	57,479	75,456
Orginated Loans and Leases | Commercial and Industrial - Agriculture | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	299	2,055
Orginated Loans and Leases | Commercial and Industrial - Agriculture | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	1,944	266
Orginated Loans and Leases | Commercial Real Estate Other
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	815,323	722,273
Orginated Loans and Leases | Commercial Real Estate Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	776,632	677,261
Orginated Loans and Leases | Commercial Real Estate Other | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	16,054	19,782
Orginated Loans and Leases | Commercial Real Estate Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	22,637	25,230
Orginated Loans and Leases | Commercial Real Estate - Agriculture
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	47,947	48,309
Orginated Loans and Leases | Commercial Real Estate - Agriculture | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	46,021	46,317
Orginated Loans and Leases | Commercial Real Estate - Agriculture | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	798	692
Orginated Loans and Leases | Commercial Real Estate - Agriculture | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	1,128	1,300
Orginated Loans and Leases | Commercial Real Estate - Construction
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	35,418	41,605
Orginated Loans and Leases | Commercial Real Estate - Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	22,570	26,126
Orginated Loans and Leases | Commercial Real Estate - Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	6,590	8,505
Orginated Loans and Leases | Commercial Real Estate - Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	6,258	6,974
Acquired Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	600,584	654,107
Acquired Loans and Leases | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	516,205	583,519
Acquired Loans and Leases | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	29,300	25,381
Acquired Loans and Leases | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	55,079	45,207
Acquired Loans and Leases | Commercial and Industrial Other
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	137,423	162,427
Acquired Loans and Leases | Commercial and Industrial Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	109,404	139,719
Acquired Loans and Leases | Commercial and Industrial Other | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	12,509	7,717
Acquired Loans and Leases | Commercial and Industrial Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	15,510	14,991
Acquired Loans and Leases | Commercial and Industrial - Agriculture
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	0	0
Acquired Loans and Leases | Commercial and Industrial - Agriculture | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	0	0
Acquired Loans and Leases | Commercial and Industrial - Agriculture | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	0	0
Acquired Loans and Leases | Commercial and Industrial - Agriculture | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	0	0
Acquired Loans and Leases | Commercial Real Estate Other
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	430,725	445,359
Acquired Loans and Leases | Commercial Real Estate Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	386,007	415,397
Acquired Loans and Leases | Commercial Real Estate Other | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	13,306	10,112
Acquired Loans and Leases | Commercial Real Estate Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	31,412	19,850
Acquired Loans and Leases | Commercial Real Estate - Agriculture
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	3,178	3,247
Acquired Loans and Leases | Commercial Real Estate - Agriculture | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	1,117	813
Acquired Loans and Leases | Commercial Real Estate - Agriculture | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	2,061	2,136
Acquired Loans and Leases | Commercial Real Estate - Agriculture | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	0	298
Acquired Loans and Leases | Commercial Real Estate - Construction
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	29,257	43,074
Acquired Loans and Leases | Commercial Real Estate - Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	19,676	27,590
Acquired Loans and Leases | Commercial Real Estate - Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	1,424	5,416
Acquired Loans and Leases | Commercial Real Estate - Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases, gross	$ 8,157	$ 10,068