Loans and Leases (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases $ 3,981,336 $ 3,774,832
Less: unearned income and deferred costs and fees (3,223) (2,790)
Total loans and leases, net of unearned income and deferred costs and fees 3,978,113 3,772,042
Commercial and Industrial - Agriculture [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 76,872 88,299
Commercial and Industrial Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 899,417 852,834
Commercial and industrial, total [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 976,289 941,133
Commercial Real Estate - Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 130,243 107,929
Commercial Real Estate - Agriculture [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 102,898 89,030
Commercial Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 1,545,471 1,452,202
Commercial real estate, total [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 1,778,612 1,649,161
Residential Real Estate - Home equity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 242,370 244,670
Residential Real Estate - Mortgages [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 897,173 851,332
Residential real estate, total [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 1,139,543 1,096,002
Consumer Indirect [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 17,034 17,829
Consumer Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 42,902 41,815
Consumer and other, total [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 59,936 59,644
Leases [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 14,687 14,861
Covered Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 12,269 14,031
Originated Loans and Leases [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 3,554,851 3,313,558
Less: unearned income and deferred costs and fees (3,223) (2,790)
Total loans and leases, net of unearned income and deferred costs and fees 3,551,628 3,310,768
Originated Loans and Leases [Member] | Commercial and Industrial - Agriculture [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 76,872 88,299
Originated Loans and Leases [Member] | Commercial and Industrial Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 814,470 768,024
Originated Loans and Leases [Member] | Commercial and industrial, total [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 891,342 856,323
Originated Loans and Leases [Member] | Commercial Real Estate - Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 125,447 103,037
Originated Loans and Leases [Member] | Commercial Real Estate - Agriculture [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 97,645 86,935
Originated Loans and Leases [Member] | Commercial Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 1,291,764 1,167,250
Originated Loans and Leases [Member] | Commercial real estate, total [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 1,514,856 1,357,222
Originated Loans and Leases [Member] | Residential Real Estate - Home equity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 204,138 202,578
Originated Loans and Leases [Member] | Residential Real Estate - Mortgages [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 870,869 823,841
Originated Loans and Leases [Member] | Residential real estate, total [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 1,075,007 1,026,419
Originated Loans and Leases [Member] | Consumer Indirect [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 17,034 17,829
Originated Loans and Leases [Member] | Consumer Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 41,925 40,904
Originated Loans and Leases [Member] | Consumer and other, total [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 58,959 58,733
Originated Loans and Leases [Member] | Leases [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 14,687 14,861
Originated Loans and Leases [Member] | Covered Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 0 0
Acquired Loans and Leases [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 426,485 461,274
Less: unearned income and deferred costs and fees 0 0
Total loans and leases, net of unearned income and deferred costs and fees 426,485 461,274
Acquired Loans and Leases [Member] | Commercial and Industrial - Agriculture [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 0 0
Acquired Loans and Leases [Member] | Commercial and Industrial Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 84,947 84,810
Acquired Loans and Leases [Member] | Commercial and industrial, total [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 84,947 84,810
Acquired Loans and Leases [Member] | Commercial Real Estate - Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 4,796 4,892
Acquired Loans and Leases [Member] | Commercial Real Estate - Agriculture [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 5,253 2,095
Acquired Loans and Leases [Member] | Commercial Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 253,707 284,952
Acquired Loans and Leases [Member] | Commercial real estate, total [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 263,756 291,939
Acquired Loans and Leases [Member] | Residential Real Estate - Home equity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 38,232 42,092
Acquired Loans and Leases [Member] | Residential Real Estate - Mortgages [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 26,304 27,491
Acquired Loans and Leases [Member] | Residential real estate, total [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 64,536 69,583
Acquired Loans and Leases [Member] | Consumer Indirect [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 0 0
Acquired Loans and Leases [Member] | Consumer Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 977 911
Acquired Loans and Leases [Member] | Consumer and other, total [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 977 911
Acquired Loans and Leases [Member] | Leases [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases 0 0
Acquired Loans and Leases [Member] | Covered Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans and leases $ 12,269 $ 14,031