Credit Quality Assessment (Impaired Loans by Portfolio) (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable Impaired [Line Items]
Average impaired loans for the period	$ 29,828	$ 34,331	$ 38,379
Contractual interest income due on impaired loans during the period	2,527	2,339	2,612
Interest income on impaired loans recognized on a cash basis	961	773	1,374
Interest income on impaired loans recognized on an accrual basis	274	280	$ 473
Commercial
Financing Receivable Impaired [Line Items]
Average impaired loans for the period	4,714	5,308
Contractual interest income due on impaired loans during the period	450	311
Interest income on impaired loans recognized on a cash basis	273	252
Interest income on impaired loans recognized on an accrual basis	113	63
All Other
Financing Receivable Impaired [Line Items]
Average impaired loans for the period	4,869	7,082
Contractual interest income due on impaired loans during the period	208	87
Interest income on impaired loans recognized on a cash basis	104	60
Interest income on impaired loans recognized on an accrual basis	43	106
Commercial Real Estate Portfolio Segment \| Commercial Acquisition, Development and Construction
Financing Receivable Impaired [Line Items]
Average impaired loans for the period	882	3,651
Contractual interest income due on impaired loans during the period	304	352
Interest income on impaired loans recognized on a cash basis	11	39
Interest income on impaired loans recognized on an accrual basis	0	0
Commercial Real Estate Portfolio Segment \| Commercial Investor Real Estate
Financing Receivable Impaired [Line Items]
Average impaired loans for the period	11,145	9,327
Contractual interest income due on impaired loans during the period	918	730
Interest income on impaired loans recognized on a cash basis	226	78
Interest income on impaired loans recognized on an accrual basis	107	111
Commercial Real Estate Portfolio Segment \| Commercial Owner Occupied Real Estate
Financing Receivable Impaired [Line Items]
Average impaired loans for the period	8,218	8,963
Contractual interest income due on impaired loans during the period	647	859
Interest income on impaired loans recognized on a cash basis	347	344
Interest income on impaired loans recognized on an accrual basis	$ 11	$ 0

Loans and Leases Receivable, Impaired, Contractual Interest Income

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- Definition

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+ References

No definition available.

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- Definition

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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- Definition

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.

+ References

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+ References

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