Loans and Leases (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 3,056,310	$ 2,955,473
Less: unearned income and deferred costs and fees	(1,127)	(863)
Originated loans and leases, net of unearned income and deferred costs and fees	2,309,232	2,133,106
Commercial and Industrial - Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	59,722	77,777
Commercial and Industrial Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	634,614	614,303
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	694,336	692,080
Commercial Real Estate - Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	64,675	84,679
Commercial Real Estate - Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	51,125	51,556
Commercial Real Estate Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,246,049	1,167,632
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,361,849	1,303,867
Residential Real Estate - Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	235,587	241,377
Residential Real Estate - Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	671,033	615,479
Residential real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	906,620	856,856
Consumer and other - Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	23,795	26,703
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	33,114	33,749
Consumer and other, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	56,909	60,452
Finance Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	5,048	4,618
Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	31,548	37,600
Orginated Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,310,359	2,133,969
Less: unearned income and deferred costs and fees	(1,127)	(863)
Originated loans and leases, net of unearned income and deferred costs and fees	2,309,232	2,133,106
Orginated Loans and Leases | Commercial and Industrial - Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	59,722	77,777
Orginated Loans and Leases | Commercial and Industrial Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	497,191	446,876
Orginated Loans and Leases | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	556,913	524,653
Orginated Loans and Leases | Commercial Real Estate - Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	35,418	41,605
Orginated Loans and Leases | Commercial Real Estate - Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	47,947	48,309
Orginated Loans and Leases | Commercial Real Estate Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	815,323	722,273
Orginated Loans and Leases | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	898,688	812,187
Orginated Loans and Leases | Residential Real Estate - Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	161,191	159,720
Orginated Loans and Leases | Residential Real Estate - Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	632,996	573,861
Orginated Loans and Leases | Residential real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	794,187	733,581
Orginated Loans and Leases | Consumer and other - Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	23,783	26,679
Orginated Loans and Leases | Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	31,740	32,251
Orginated Loans and Leases | Consumer and other, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	55,523	58,930
Orginated Loans and Leases | Finance Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	5,048	4,618
Orginated Loans and Leases | Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Acquired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	745,951	821,504
Less: unearned income and deferred costs and fees	0	0
Originated loans and leases, net of unearned income and deferred costs and fees	745,951	821,504
Acquired Loans and Leases | Commercial and Industrial - Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Acquired Loans and Leases | Commercial and Industrial Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	137,423	167,427
Acquired Loans and Leases | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	137,423	167,427
Acquired Loans and Leases | Commercial Real Estate - Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	29,257	43,074
Acquired Loans and Leases | Commercial Real Estate - Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	3,178	3,247
Acquired Loans and Leases | Commercial Real Estate Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	430,726	445,359
Acquired Loans and Leases | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	463,161	491,680
Acquired Loans and Leases | Residential Real Estate - Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	74,396	81,657
Acquired Loans and Leases | Residential Real Estate - Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	38,037	41,618
Acquired Loans and Leases | Residential real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	112,433	123,275
Acquired Loans and Leases | Consumer and other - Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	12	24
Acquired Loans and Leases | Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,374	1,498
Acquired Loans and Leases | Consumer and other, total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,386	1,522
Acquired Loans and Leases | Finance Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Acquired Loans and Leases | Covered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 31,548	$ 37,600