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Allowance for Loan Losses - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Total ending allowance balance	$ 17,667	$ 17,820	$ 16,394	$ 14,837
Total ending loans balance	7,351	6,697	$ 7,172
Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Individually evaluated for impairment	541	1,035
Allowance For Loan Losses, Collectively evaluated for impairment	17,126	16,785
Total ending allowance balance	17,667	17,820
Commercial [Member] | Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Individually evaluated for impairment	541	1,035
Allowance For Loan Losses, Collectively evaluated for impairment	11,455	9,460
Total ending allowance balance	11,996	10,495
Real Estate [Member] | Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Collectively evaluated for impairment	923	1,676
Total ending allowance balance	923	1,676
Consumer [Member] | Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Collectively evaluated for impairment	3,671	4,643
Total ending allowance balance	3,671	4,643
Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Individually evaluated for impairment	7,347	6,696
Loans: Collectively evaluated for impairment	3,627,249	3,004,874
Total ending loans balance	3,634,596	3,011,570
Loans [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Individually evaluated for impairment	7,347	6,696
Loans: Collectively evaluated for impairment	2,040,299	1,715,856
Total ending loans balance	2,047,646	1,722,552
Loans [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Collectively evaluated for impairment	770,705	668,124
Total ending loans balance	770,705	668,124
Loans [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Collectively evaluated for impairment	665,952	546,774
Total ending loans balance	665,952	546,774
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Collectively evaluated for impairment	1,077	1,006
Total ending allowance balance	1,077	1,006
Mortgage Warehousing [Member] | Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Collectively evaluated for impairment	150,293	74,120
Total ending loans balance	$ 150,293	$ 74,120

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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

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

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- Definition

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

+ References

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-Publisher FASB
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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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