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Allowance for Loan Losses - Transactions in Allowance for Loan Losses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Receivables [Abstract]
Balance at beginning of year			$ 10,644	$ 13,075	$ 13,075
Provision charged to (recovery from) operating expense	(100)	275	(700)	2,525	(425)
Loan recoveries			619	575	2,486
Loan charge-offs			(847)	(4,300)	(4,492)
Balance at end of period	$ 9,716	$ 11,875	$ 9,716	$ 11,875	$ 10,644

X

- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Staff Accounting Bulletin (SAB)

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Amount of expense related to estimated loss from loan and lease transactions.

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