Allowance for Loan and Lease Losses (Details 6) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Total	$ 4,301,931	$ 4,261,979
Commercial and Industrial Other
Total	965,726	926,372
Commercial and Industrial - Agriculture
Total	88,999	118,247
Commercial Real Estate Other
Total	1,673,988	1,673,295
Commercial Real Estate - Agriculture
Total	116,944	102,776
Commercial Real Estate - Construction
Total	144,233	144,770
Originated Loans and Leases
Loans and Leases, gross	2,675,426	2,635,335
Total	3,926,551	3,867,868
Originated Loans and Leases | Pass
Loans and Leases, gross	2,635,657	2,594,534
Originated Loans and Leases | Special Mention
Loans and Leases, gross	18,861	20,485
Originated Loans and Leases | Substandard
Loans and Leases, gross	20,908	20,316
Originated Loans and Leases | Commercial and Industrial Other
Loans and Leases, gross	886,370	847,055
Total	886,370	847,055
Originated Loans and Leases | Commercial and Industrial Other | Pass
Loans and Leases, gross	875,097	836,788
Originated Loans and Leases | Commercial and Industrial Other | Special Mention
Loans and Leases, gross	6,780	7,218
Originated Loans and Leases | Commercial and Industrial Other | Substandard
Loans and Leases, gross	4,493	3,049
Originated Loans and Leases | Commercial and Industrial - Agriculture
Loans and Leases, gross	88,999	118,247
Total	88,999	118,247
Originated Loans and Leases | Commercial and Industrial - Agriculture | Pass
Loans and Leases, gross	87,119	117,135
Originated Loans and Leases | Commercial and Industrial - Agriculture | Special Mention
Loans and Leases, gross	1,813	755
Originated Loans and Leases | Commercial and Industrial - Agriculture | Substandard
Loans and Leases, gross	67	357
Originated Loans and Leases | Commercial Real Estate Other
Loans and Leases, gross	1,440,690	1,431,690
Total	1,440,690	1,431,690
Originated Loans and Leases | Commercial Real Estate Other | Pass
Loans and Leases, gross	1,417,648	1,403,370
Originated Loans and Leases | Commercial Real Estate Other | Special Mention
Loans and Leases, gross	7,083	11,939
Originated Loans and Leases | Commercial Real Estate Other | Substandard
Loans and Leases, gross	15,959	16,381
Originated Loans and Leases | Commercial Real Estate - Agriculture
Loans and Leases, gross	116,682	102,509
Total	116,682	102,509
Originated Loans and Leases | Commercial Real Estate - Agriculture | Pass
Loans and Leases, gross	113,108	101,407
Originated Loans and Leases | Commercial Real Estate - Agriculture | Special Mention
Loans and Leases, gross	3,185	573
Originated Loans and Leases | Commercial Real Estate - Agriculture | Substandard
Loans and Leases, gross	389	529
Originated Loans and Leases | Commercial Real Estate - Construction
Loans and Leases, gross	142,685	135,834
Total	142,685	135,834
Originated Loans and Leases | Commercial Real Estate - Construction | Pass
Loans and Leases, gross	142,685	135,834
Originated Loans and Leases | Commercial Real Estate - Construction | Special Mention
Loans and Leases, gross	0	0
Originated Loans and Leases | Commercial Real Estate - Construction | Substandard
Loans and Leases, gross	0	0
Total Acquired Loans
Loans and Leases, gross	314,464	330,125
Total	375,380	394,111
Total Acquired Loans | Pass
Loans and Leases, gross	304,317	316,458
Total Acquired Loans | Special Mention
Loans and Leases, gross	519	526
Total Acquired Loans | Substandard
Loans and Leases, gross	9,628	13,141
Total Acquired Loans | Commercial and Industrial Other
Loans and Leases, gross	79,356	79,317
Total	79,356	79,317
Total Acquired Loans | Commercial and Industrial Other | Pass
Loans and Leases, gross	78,030	77,921
Total Acquired Loans | Commercial and Industrial Other | Special Mention
Loans and Leases, gross	0	0
Total Acquired Loans | Commercial and Industrial Other | Substandard
Loans and Leases, gross	1,326	1,396
Total Acquired Loans | Commercial and Industrial - Agriculture
Loans and Leases, gross	0	0
Total	0	0
Total Acquired Loans | Commercial and Industrial - Agriculture | Pass
Loans and Leases, gross	0	0
Total Acquired Loans | Commercial and Industrial - Agriculture | Special Mention
Loans and Leases, gross	0	0
Total Acquired Loans | Commercial and Industrial - Agriculture | Substandard
Loans and Leases, gross	0	0
Total Acquired Loans | Commercial Real Estate Other
Loans and Leases, gross	233,298	241,605
Total	233,298	241,605
Total Acquired Loans | Commercial Real Estate Other | Pass
Loans and Leases, gross	224,477	229,334
Total Acquired Loans | Commercial Real Estate Other | Special Mention
Loans and Leases, gross	519	526
Total Acquired Loans | Commercial Real Estate Other | Substandard
Loans and Leases, gross	8,302	11,745
Total Acquired Loans | Commercial Real Estate - Agriculture
Loans and Leases, gross	262	267
Total	262	267
Total Acquired Loans | Commercial Real Estate - Agriculture | Pass
Loans and Leases, gross	262	267
Total Acquired Loans | Commercial Real Estate - Agriculture | Special Mention
Loans and Leases, gross	0	0
Total Acquired Loans | Commercial Real Estate - Agriculture | Substandard
Loans and Leases, gross	0	0
Total Acquired Loans | Commercial Real Estate - Construction
Loans and Leases, gross	1,548	8,936
Total	1,548	8,936
Total Acquired Loans | Commercial Real Estate - Construction | Pass
Loans and Leases, gross	1,548	8,936
Total Acquired Loans | Commercial Real Estate - Construction | Special Mention
Loans and Leases, gross	0	0
Total Acquired Loans | Commercial Real Estate - Construction | Substandard
Loans and Leases, gross	$ 0	$ 0