Loans - Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	$ 57,609	$ 73,541
Recorded Investment With Related Allowance	87,399	117,807
Total Recorded Investment	145,008	191,348
Unpaid Contractual Principal Balance	158,936	225,471
Related Allowance	12,525	23,525
Commercial real estate loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	44,286	58,643
Recorded Investment With Related Allowance	47,012	55,995
Total Recorded Investment	91,298	114,638
Unpaid Contractual Principal Balance	97,701	131,705
Related Allowance	5,502	8,676
Consumer loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	235	1,010
Recorded Investment With Related Allowance	2,911	84
Total Recorded Investment	3,146	1,094
Unpaid Contractual Principal Balance	3,247	1,211
Related Allowance	465	82
Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	6,579	3,806
Recorded Investment With Related Allowance	21,645	43,497
Total Recorded Investment	28,224	47,303
Unpaid Contractual Principal Balance	33,677	59,891
Related Allowance	4,929	11,032
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	29,784	46,872
Recorded Investment With Related Allowance	44,713	47,973
Total Recorded Investment	74,497	94,845
Unpaid Contractual Principal Balance	77,007	110,227
Related Allowance	5,342	7,874
Construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	14,502	11,771
Recorded Investment With Related Allowance	2,299	8,022
Total Recorded Investment	16,801	19,793
Unpaid Contractual Principal Balance	20,694	21,478
Related Allowance	160	802
Residential mortgage [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	6,509	10,082
Recorded Investment With Related Allowance	15,831	18,231
Total Recorded Investment	22,340	28,313
Unpaid Contractual Principal Balance	24,311	32,664
Related Allowance	1,629	3,735
Home equity [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Related Allowance	235	1,010
Recorded Investment With Related Allowance	2,911	84
Total Recorded Investment	3,146	1,094
Unpaid Contractual Principal Balance	3,247	1,211
Related Allowance	$ 465	$ 82

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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=35738203&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=35738203&loc=d3e5212-111524

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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)(4)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

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