Allowance for Loan and Lease Losses (Details 6) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Originated Loans and Leases [Member]
Loans and Leases, gross	$ 2,268,011	$ 2,213,545
Originated Loans and Leases [Member] | Pass [Member]
Loans and Leases, gross	2,229,597	2,175,702
Originated Loans and Leases [Member] | Special Mention [Member]
Loans and Leases, gross	20,388	19,657
Originated Loans and Leases [Member] | Substandard [Member]
Loans and Leases, gross	18,026	18,186
Originated Loans and Leases [Member] | Commercial and Industrial Other [Member]
Loans and Leases, gross	769,047	768,024
Originated Loans and Leases [Member] | Commercial and Industrial Other [Member] | Pass [Member]
Loans and Leases, gross	761,441	759,023
Originated Loans and Leases [Member] | Commercial and Industrial Other [Member] | Special Mention [Member]
Loans and Leases, gross	3,839	3,531
Originated Loans and Leases [Member] | Commercial and Industrial Other [Member] | Substandard [Member]
Loans and Leases, gross	3,767	5,470
Originated Loans and Leases [Member] | Commercial and Industrial - Agriculture [Member]
Loans and Leases, gross	74,890	88,299
Originated Loans and Leases [Member] | Commercial and Industrial - Agriculture [Member] | Pass [Member]
Loans and Leases, gross	74,054	87,488
Originated Loans and Leases [Member] | Commercial and Industrial - Agriculture [Member] | Special Mention [Member]
Loans and Leases, gross	145	78
Originated Loans and Leases [Member] | Commercial and Industrial - Agriculture [Member] | Substandard [Member]
Loans and Leases, gross	691	733
Originated Loans and Leases [Member] | Commercial Real Estate Other [Member]
Loans and Leases, gross	1,214,190	1,167,250
Originated Loans and Leases [Member] | Commercial Real Estate Other [Member] | Pass [Member]
Loans and Leases, gross	1,184,727	1,143,238
Originated Loans and Leases [Member] | Commercial Real Estate Other [Member] | Special Mention [Member]
Loans and Leases, gross	16,269	12,378
Originated Loans and Leases [Member] | Commercial Real Estate Other [Member] | Substandard [Member]
Loans and Leases, gross	13,194	11,634
Originated Loans and Leases [Member] | Commercial Real Estate - Agriculture [Member]
Loans and Leases, gross	94,300	86,935
Originated Loans and Leases [Member] | Commercial Real Estate - Agriculture [Member] | Pass [Member]
Loans and Leases, gross	93,791	86,445
Originated Loans and Leases [Member] | Commercial Real Estate - Agriculture [Member] | Special Mention [Member]
Loans and Leases, gross	135	141
Originated Loans and Leases [Member] | Commercial Real Estate - Agriculture [Member] | Substandard [Member]
Loans and Leases, gross	374	349
Originated Loans and Leases [Member] | Commercial Real Estate - Construction [Member]
Loans and Leases, gross	115,584	103,037
Originated Loans and Leases [Member] | Commercial Real Estate - Construction [Member] | Pass [Member]
Loans and Leases, gross	115,584	99,508
Originated Loans and Leases [Member] | Commercial Real Estate - Construction [Member] | Special Mention [Member]
Loans and Leases, gross	0	3,529
Originated Loans and Leases [Member] | Commercial Real Estate - Construction [Member] | Substandard [Member]
Loans and Leases, gross	0	0
Acquired Loans and Leases [Member]
Loans and Leases, gross	368,687	376,749
Acquired Loans and Leases [Member] | Pass [Member]
Loans and Leases, gross	350,708	359,202
Acquired Loans and Leases [Member] | Special Mention [Member]
Loans and Leases, gross	534	540
Acquired Loans and Leases [Member] | Substandard [Member]
Loans and Leases, gross	17,445	17,007
Acquired Loans and Leases [Member] | Commercial and Industrial Other [Member]
Loans and Leases, gross	86,542	84,810
Acquired Loans and Leases [Member] | Commercial and Industrial Other [Member] | Pass [Member]
Loans and Leases, gross	84,175	82,662
Acquired Loans and Leases [Member] | Commercial and Industrial Other [Member] | Special Mention [Member]
Loans and Leases, gross	0	0
Acquired Loans and Leases [Member] | Commercial and Industrial Other [Member] | Substandard [Member]
Loans and Leases, gross	2,367	2,148
Acquired Loans and Leases [Member] | Commercial and Industrial - Agriculture [Member]
Loans and Leases, gross	0	0
Acquired Loans and Leases [Member] | Commercial and Industrial - Agriculture [Member] | Pass [Member]
Loans and Leases, gross	0	0
Acquired Loans and Leases [Member] | Commercial and Industrial - Agriculture [Member] | Special Mention [Member]
Loans and Leases, gross	0	0
Acquired Loans and Leases [Member] | Commercial and Industrial - Agriculture [Member] | Substandard [Member]
Loans and Leases, gross	0	0
Acquired Loans and Leases [Member] | Commercial Real Estate Other [Member]
Loans and Leases, gross	278,023	284,952
Acquired Loans and Leases [Member] | Commercial Real Estate Other [Member] | Pass [Member]
Loans and Leases, gross	262,847	271,584
Acquired Loans and Leases [Member] | Commercial Real Estate Other [Member] | Special Mention [Member]
Loans and Leases, gross	534	540
Acquired Loans and Leases [Member] | Commercial Real Estate Other [Member] | Substandard [Member]
Loans and Leases, gross	14,642	12,828
Acquired Loans and Leases [Member] | Commercial Real Estate - Agriculture [Member]
Loans and Leases, gross	2,013	2,095
Acquired Loans and Leases [Member] | Commercial Real Estate - Agriculture [Member] | Pass [Member]
Loans and Leases, gross	1,904	423
Acquired Loans and Leases [Member] | Commercial Real Estate - Agriculture [Member] | Special Mention [Member]
Loans and Leases, gross	0	0
Acquired Loans and Leases [Member] | Commercial Real Estate - Agriculture [Member] | Substandard [Member]
Loans and Leases, gross	109	1,672
Acquired Loans and Leases [Member] | Commercial Real Estate - Construction [Member]
Loans and Leases, gross	2,109	4,892
Acquired Loans and Leases [Member] | Commercial Real Estate - Construction [Member] | Pass [Member]
Loans and Leases, gross	1,782	4,533
Acquired Loans and Leases [Member] | Commercial Real Estate - Construction [Member] | Special Mention [Member]
Loans and Leases, gross	0	0
Acquired Loans and Leases [Member] | Commercial Real Estate - Construction [Member] | Substandard [Member]
Loans and Leases, gross	$ 327	$ 359