Loans - Average Recorded Investment and Interest Income Recognized on Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accounts, Notes, Loans and Financing Receivable
Average Recorded Investment	$ 139,876	$ 174,782	$ 144,314	$ 183,617
Interest Income Recognized	1,518	1,799	2,680	3,230
Total commercial real estate loans
Accounts, Notes, Loans and Financing Receivable
Average Recorded Investment	87,173	112,184	91,161	114,669
Interest Income Recognized	1,020	1,078	1,656	1,867
Total consumer loans
Accounts, Notes, Loans and Financing Receivable
Average Recorded Investment	4,607	1,427	4,049	1,253
Interest Income Recognized	38	29	68	42
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable
Average Recorded Investment	25,530	34,698	26,898	40,707
Interest Income Recognized	211	290	457	659
Commercial real estate
Accounts, Notes, Loans and Financing Receivable
Average Recorded Investment	75,688	93,123	77,098	95,321
Interest Income Recognized	894	924	1,380	1,569
Construction
Accounts, Notes, Loans and Financing Receivable
Average Recorded Investment	11,485	19,061	14,063	19,348
Interest Income Recognized	126	154	276	298
Residential mortgage
Accounts, Notes, Loans and Financing Receivable
Average Recorded Investment	22,566	26,473	22,206	26,988
Interest Income Recognized	249	402	499	662
Home equity
Accounts, Notes, Loans and Financing Receivable
Average Recorded Investment	4,607	1,427	4,049	1,253
Interest Income Recognized	$ 38	$ 29	$ 68	$ 42

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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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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.

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