Allowance for Loan and Lease Losses (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 3,206,453	$ 3,196,507
Commercial and industrial, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	760,923	765,730
Commercial real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,427,434	1,411,314
Residential real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	935,247	933,294
Consumer and other, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	53,214	54,738
Finance Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,529	5,563
Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	24,106	25,868
Orginated Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually Evaluated For Impairment	20,289	22,156
Collectively Evaluated For Impairment	2,537,474	2,507,311
Total	2,557,763	2,529,467
Orginated Loans and Leases [Member] | Commercial and industrial, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually Evaluated For Impairment	3,581	4,664
Collectively Evaluated For Impairment	627,464	632,563
Total	631,045	637,227
Orginated Loans and Leases [Member] | Commercial real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually Evaluated For Impairment	15,650	16,269
Collectively Evaluated For Impairment	1,016,979	986,119
Total	1,032,629	1,002,388
Orginated Loans and Leases [Member] | Residential real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually Evaluated For Impairment	1,058	1,223
Collectively Evaluated For Impairment	835,446	829,552
Total	836,504	830,775
Orginated Loans and Leases [Member] | Consumer and other, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually Evaluated For Impairment	0	0
Collectively Evaluated For Impairment	52,056	53,514
Total	52,056	53,514
Orginated Loans and Leases [Member] | Finance Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually Evaluated For Impairment	0	0
Collectively Evaluated For Impairment	5,529	5,563
Total	5,529	5,563
Orginated Loans and Leases [Member] | Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Acquired Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually Evaluated For Impairment	9,220	4,733
Loans Acquired With Deteriorated Credit Quality	43,194	46,809
Collectively Evaluated For Impairment	596,363	615,498
Total	648,690	667,040
Acquired Loans and Leases [Member] | Commercial and industrial, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually Evaluated For Impairment	2,777	2,231
Loans Acquired With Deteriorated Credit Quality	1,428	2,558
Collectively Evaluated For Impairment	125,673	123,714
Total	129,878	128,503
Acquired Loans and Leases [Member] | Commercial real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually Evaluated For Impairment	6,356	2,429
Loans Acquired With Deteriorated Credit Quality	8,638	10,263
Collectively Evaluated For Impairment	379,811	396,234
Total	394,805	408,926
Acquired Loans and Leases [Member] | Residential real estate, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually Evaluated For Impairment	87	73
Loans Acquired With Deteriorated Credit Quality	9,022	9,355
Collectively Evaluated For Impairment	89,634	93,091
Total	98,743	102,519
Acquired Loans and Leases [Member] | Consumer and other, total [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually Evaluated For Impairment	0	0
Loans Acquired With Deteriorated Credit Quality	0	0
Collectively Evaluated For Impairment	1,158	1,224
Total	1,158	1,224
Acquired Loans and Leases [Member] | Finance Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Acquired Loans and Leases [Member] | Covered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually Evaluated For Impairment	0	0
Loans Acquired With Deteriorated Credit Quality	24,106	24,633
Collectively Evaluated For Impairment	0	1,235
Total	$ 24,106	$ 25,868