Loans and Leases (Interest Income From Impaired Loans And Leases, By Class) (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 305,015	$ 339,477	$ 380,415
Accrued Interest Income	8,557	12,180	13,129
Cash Basis Interest Income	2,238	2,424	3,678
Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	138,215	142,198	144,325
Accrued Interest Income	4,473	4,644	4,119
Cash Basis Interest Income	1,139	1,221	1,954
Consumer Portfolio Segment [Member] \| Home Equity Loan [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	49,337	51,171	53,318
Accrued Interest Income	1,451	1,484	1,003
Cash Basis Interest Income	1,099	1,203	1,724
Commercial Real Estate Portfolio Segment [Member] \| Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	6,062	8,381	15,254
Accrued Interest Income	133	269	620
Cash Basis Interest Income	0	0	0
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	527	421	1,284
Accrued Interest Income	16	28	22
Cash Basis Interest Income	0	0	0
Commercial and Industrial Sector [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	46,379	44,097	60,558
Accrued Interest Income	1,319	2,326	2,889
Cash Basis Interest Income	0	0	0
Commercial Real Estate [Member] \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	64,495	93,209	105,676
Accrued Interest Income	1,165	3,429	4,476
Cash Basis Interest Income	$ 0	$ 0	$ 0

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524

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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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