Credit Quality Assessment (Impaired Loans by Portfolio) (Detail) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Financing Receivable Impaired [Line Items]
Average impaired loans for the period	$ 30,312,000	$ 34,331,000
Contractual interest income due on impaired loans during the period	698,000	2,339,000
Interest income on impaired loans recognized on a cash basis	190,000	773,000
Interest income on impaired loans recognized on an accrual basis	66,000	280,000
Commercial
Financing Receivable Impaired [Line Items]
Average impaired loans for the period	4,377,000	5,308,000
Contractual interest income due on impaired loans during the period	135,000	311,000
Interest income on impaired loans recognized on a cash basis	54,000	252,000
Interest income on impaired loans recognized on an accrual basis	14,000	63,000
All Other
Financing Receivable Impaired [Line Items]
Average impaired loans for the period	3,827,000	7,082,000
Contractual interest income due on impaired loans during the period	57,000	87,000
Interest income on impaired loans recognized on a cash basis	22,000	60,000
Interest income on impaired loans recognized on an accrual basis	25,000	106,000
Commercial Real Estate Portfolio Segment \| Commercial Acquisition, Development and Construction
Financing Receivable Impaired [Line Items]
Average impaired loans for the period	1,914,000	3,651,000
Contractual interest income due on impaired loans during the period	87,000	352,000
Interest income on impaired loans recognized on a cash basis	0	39,000
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	11,237,000	9,327,000
Contractual interest income due on impaired loans during the period	220,000	730,000
Interest income on impaired loans recognized on a cash basis	11,000	78,000
Interest income on impaired loans recognized on an accrual basis	27,000	111,000
Commercial Real Estate Portfolio Segment \| Commercial Owner Occupied Real Estate
Financing Receivable Impaired [Line Items]
Average impaired loans for the period	8,958,000	8,963,000
Contractual interest income due on impaired loans during the period	199,000	859,000
Interest income on impaired loans recognized on a cash basis	103,000	344,000
Interest income on impaired loans recognized on an accrual basis	$ 0	$ 0

Loans and Leases Receivable, Impaired, Contractual Interest Income

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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=35738203&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=35738203&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

+ Details

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- Definition

Amount of interest income recognized on a cash-basis method of accounting 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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