The balance of financing receivables that were acquired with deteriorated credit quality.

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-Name Accounting Standards Codification

-Topic 310

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The valuation allowance for financing receivables acquired with deteriorated credit quality.

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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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The balance of financing receivables that were collectively evaluated for impairment.

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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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-Number Topic 6

-Section L

-Subsection 1

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Allowance for Loan Losses - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Total ending allowance balance	$ 16,634	$ 16,501	$ 16,102	$ 15,992
Total ending loans balance	8,547		7,335
Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Individually evaluated for impairment	1,029	1,589
Allowance For Loan Losses, Collectively evaluated for impairment	15,351	14,418
Allowance For Loan Losses, Loans acquired with deteriorated credit quality	254	494
Total ending allowance balance	16,634	16,501
Commercial [Member] \| Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Individually evaluated for impairment	1,029	1,589
Allowance For Loan Losses, Collectively evaluated for impairment	6,593	5,827
Allowance For Loan Losses, Loans acquired with deteriorated credit quality	254	494
Total ending allowance balance	7,876	7,910
Real Estate [Member] \| Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Collectively evaluated for impairment	3,281	2,508
Total ending allowance balance	3,281	2,508
Consumer [Member] \| Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Collectively evaluated for impairment	4,205	4,951
Total ending allowance balance	4,205	4,951
Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Individually evaluated for impairment	8,547	11,055
Loans: Collectively evaluated for impairment	1,454,954	1,370,740
Loans acquired with deteriorated credit quality	1,729	591
Total ending loans balance	1,465,230	1,382,386
Loans [Member] \| Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Individually evaluated for impairment	8,547	11,055
Loans: Collectively evaluated for impairment	687,092	664,251
Loans acquired with deteriorated credit quality	1,729	591
Total ending loans balance	697,368	675,897
Loans [Member] \| Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Collectively evaluated for impairment	261,155	255,383
Total ending loans balance	261,155	255,383
Loans [Member] \| Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Collectively evaluated for impairment	327,328	321,470
Total ending loans balance	327,328	321,470
Mortgage Warehousing [Member] \| Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Collectively evaluated for impairment	1,272	1,132
Total ending allowance balance	1,272	1,132
Mortgage Warehousing [Member] \| Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Collectively evaluated for impairment	179,379	129,636
Total ending loans balance	$ 179,379	$ 129,636