Summary of Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Impaired [Line Items]
Impaired loans with a valuation allowance	$ 27,526	$ 36,742	$ 18,946
Impaired loans without a valuation allowance	21,247	30,833	50,668
Total impaired loans	48,773	67,575	69,614
Allowance for loan and lease losses related to impaired loans	5,149	7,791	3,845
Allowance for loan and lease losses related to loans collectively evaluated	37,808	41,635	58,290
Total allowance for loan and lease losses	42,957	49,426	62,135
Average impaired loans for the period	57,438	68,377	75,556
Contractual interest income due on impaired loans during the period	4,433	4,973	6,651
Interest income on impaired loans recognized on a cash basis	1,121	1,523	0
Interest income on impaired loans recognized on an accrual basis	$ 560	$ 325	$ 524

Loans and Leases Receivable, Impaired, Contractual Interest Income

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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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.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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