Loans and Leases (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 3,429,878	$ 3,395,676
Less: unearned income and deferred costs and fees	(2,321)	(2,388)
Total loans and leases, net of unearned income and deferred costs and fees	3,427,557	3,393,288
Commercial and Industrial - Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	58,742	78,507
Commercial and Industrial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	800,296	785,563
Commercial and industrial, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	859,038	864,070
Commercial Real Estate - Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	114,876	108,333
Commercial Real Estate - Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	62,249	62,176
Commercial Real Estate Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,304,132	1,288,109
Commercial real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,481,257	1,458,618
Residential Real Estate - Home equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	241,261	242,965
Residential Real Estate - Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	763,738	743,186
Residential real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,004,999	986,151
Consumer and other - Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	17,716	18,298
Consumer and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	36,994	36,969
Consumer and other, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	54,710	55,267
Finance Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	13,106	12,251
Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	16,768	19,319
Originated Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,900,854	2,842,362
Less: unearned income and deferred costs and fees	(2,321)	(2,388)
Total loans and leases, net of unearned income and deferred costs and fees	2,898,533	2,839,974
Originated Loans and Leases [Member] | Commercial and Industrial - Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	58,742	78,507
Originated Loans and Leases [Member] | Commercial and Industrial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	707,283	688,529
Originated Loans and Leases [Member] | Commercial and industrial, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	766,025	767,036
Originated Loans and Leases [Member] | Commercial Real Estate - Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	70,657	72,427
Originated Loans and Leases [Member] | Commercial Real Estate - Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	59,905	58,994
Originated Loans and Leases [Member] | Commercial Real Estate Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,016,309	979,621
Originated Loans and Leases [Member] | Commercial real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,146,871	1,111,042
Originated Loans and Leases [Member] | Residential Real Estate - Home equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	188,546	186,957
Originated Loans and Leases [Member] | Residential Real Estate - Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	732,643	710,904
Originated Loans and Leases [Member] | Residential real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	921,189	897,861
Originated Loans and Leases [Member] | Consumer and other - Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	17,716	18,298
Originated Loans and Leases [Member] | Consumer and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	35,947	35,874
Originated Loans and Leases [Member] | Consumer and other, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	53,663	54,172
Originated Loans and Leases [Member] | Finance Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	13,106	12,251
Acquired Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	529,024	553,314
Total loans and leases, net of unearned income and deferred costs and fees	529,024	553,314
Acquired Loans and Leases [Member] | Commercial and Industrial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	93,013	97,034
Acquired Loans and Leases [Member] | Commercial and industrial, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	93,013	97,034
Acquired Loans and Leases [Member] | Commercial Real Estate - Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	44,219	35,906
Acquired Loans and Leases [Member] | Commercial Real Estate - Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,344	3,182
Acquired Loans and Leases [Member] | Commercial Real Estate Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	287,823	308,488
Acquired Loans and Leases [Member] | Commercial real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	334,386	347,576
Acquired Loans and Leases [Member] | Residential Real Estate - Home equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	52,715	56,008
Acquired Loans and Leases [Member] | Residential Real Estate - Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	31,095	32,282
Acquired Loans and Leases [Member] | Residential real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	83,810	88,290
Acquired Loans and Leases [Member] | Consumer and other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,047	1,095
Acquired Loans and Leases [Member] | Consumer and other, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,047	1,095
Acquired Loans and Leases [Member] | Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 16,768	$ 19,319