Loans - Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	$ 59,431	$ 57,609
Recorded Investment With Related Allowance	91,781	87,399
Total Recorded Investment	151,212	145,008
Unpaid Contractual Principal Balance	165,884	158,936
Related Allowance	12,946	12,525
Commercial Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	46,053	44,286
Recorded Investment With Related Allowance	50,665	47,012
Total Recorded Investment	96,718	91,298
Unpaid Contractual Principal Balance	103,893	97,701
Related Allowance	5,926	5,502
Consumer Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	324	235
Recorded Investment With Related Allowance	4,197	2,911
Total Recorded Investment	4,521	3,146
Unpaid Contractual Principal Balance	4,622	3,247
Related Allowance		465
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	6,214	6,579
Recorded Investment With Related Allowance	21,665	21,645
Total Recorded Investment		28,224
Unpaid Contractual Principal Balance	33,471	33,677
Related Allowance		4,929
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	32,856	29,784
Recorded Investment With Related Allowance	47,703	44,713
Total Recorded Investment	80,559	74,497
Unpaid Contractual Principal Balance	83,068	77,007
Related Allowance	4,918	5,342
Construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	13,197	14,502
Recorded Investment With Related Allowance	2,962	2,299
Total Recorded Investment	16,159	16,801
Unpaid Contractual Principal Balance	20,825	20,694
Related Allowance	1,008	160
Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	6,840	6,509
Recorded Investment With Related Allowance	15,254	15,831
Total Recorded Investment		22,340
Unpaid Contractual Principal Balance	23,898	24,311
Related Allowance	1,432	1,629
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	324	235
Recorded Investment With Related Allowance	4,197	2,911
Total Recorded Investment		3,146
Unpaid Contractual Principal Balance	4,622	3,247
Related Allowance	764	465
Loans [Member]
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment	151,212	145,008
Loans [Member] \| Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment		22,340
Loans [Member] \| Commercial and Industrial [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment	27,879	28,224
Loans [Member] \| Residential Mortgage [Member] \| Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment	22,094
Loans [Member] \| Home Equity [Member] \| Consumer [Member]
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment	4,521	3,146
Allowance for Loan and Lease Losses [Member]
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment	12,946	12,525
Allowance for Loan and Lease Losses [Member] \| Consumer [Member]
Financing Receivable, Impaired [Line Items]
Related Allowance	764
Allowance for Loan and Lease Losses [Member] \| Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment	1,432	1,629
Allowance for Loan and Lease Losses [Member] \| Commercial and Industrial [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment	4,824	4,929
Related Allowance	4,824
Allowance for Loan and Lease Losses [Member] \| Home Equity [Member] \| Consumer [Member]
Financing Receivable, Impaired [Line Items]
Individually evaluated for impairment	$ 764	$ 465

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The balance of financing receivables that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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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 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524

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+ 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 (a)(3)

-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without 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 (a)(4)

-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

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Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

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