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Allowance for Loan Losses - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total ending allowance balance | $ 15,586 | $ 15,027 | $ 14,837 | $ 14,524 | $ 14,226 | $ 14,534
Total ending loans balance | 3,451 |  |  | $ 5,855 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total ending allowance balance | 71 |  | 0 |  |  |
Allowance for Loan Losses [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance For Loan Losses, Individually evaluated for impairment |  |  | 4 |  |  |
Allowance For Loan Losses, Collectively evaluated for impairment | 15,586 |  | 14,833 |  |  |
Total ending allowance balance | 15,586 |  | 14,837 |  |  |
Allowance for Loan Losses [Member] | Loans Purchased With Evidence of Credit Deterioration [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance For Loan Losses, Loans acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Commercial [Member] | Allowance for Loan Losses [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance For Loan Losses, Individually evaluated for impairment |  |  | 4 |  |  |
Allowance For Loan Losses, Collectively evaluated for impairment | 7,877 |  | 6,575 |  |  |
Total ending allowance balance | 7,877 |  | 6,579 |  |  |
Commercial [Member] | Allowance for Loan Losses [Member] | Loans Purchased With Evidence of Credit Deterioration [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance For Loan Losses, Loans acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Real Estate [Member] | Allowance for Loan Losses [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance For Loan Losses, Collectively evaluated for impairment | 2,129 |  | 2,090 |  |  |
Total ending allowance balance | 2,129 |  | 2,090 |  |  |
Real Estate [Member] | Allowance for Loan Losses [Member] | Loans Purchased With Evidence of Credit Deterioration [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance For Loan Losses, Loans acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Consumer [Member] | Allowance for Loan Losses [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance For Loan Losses, Collectively evaluated for impairment | 4,532 |  | 4,914 |  |  |
Total ending allowance balance | 4,532 |  | 4,914 |  |  |
Consumer [Member] | Allowance for Loan Losses [Member] | Loans Purchased With Evidence of Credit Deterioration [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance For Loan Losses, Loans acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans: Individually evaluated for impairment | 3,451 |  | 2,250 |  |  |
Loans: Collectively evaluated for impairment | 2,430,791 |  | 2,140,481 |  |  |
Total ending loans balance | 2,434,242 |  | 2,142,731 |  |  |
Loans [Member] | Loans Purchased With Evidence of Credit Deterioration [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Loans [Member] | Commercial [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans: Individually evaluated for impairment | 3,451 |  | 2,250 |  |  |
Loans: Collectively evaluated for impairment | 1,274,952 |  | 1,071,199 |  |  |
Total ending loans balance | 1,278,403 |  | 1,073,449 |  |  |
Loans [Member] | Commercial [Member] | Loans Purchased With Evidence of Credit Deterioration [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Loans [Member] | Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans: Collectively evaluated for impairment | 572,905 |  | 533,399 |  |  |
Total ending loans balance | 572,905 |  | 533,399 |  |  |
Loans [Member] | Real Estate [Member] | Loans Purchased With Evidence of Credit Deterioration [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Loans [Member] | Consumer [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans: Collectively evaluated for impairment | 486,971 |  | 399,676 |  |  |
Total ending loans balance | 486,971 |  | 399,676 |  |  |
Loans [Member] | Consumer [Member] | Loans Purchased With Evidence of Credit Deterioration [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance For Loan Losses, Collectively evaluated for impairment | 1,048 |  | 1,254 |  |  |
Total ending allowance balance | 1,048 |  | 1,254 |  |  |
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member] | Loans Purchased With Evidence of Credit Deterioration [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance For Loan Losses, Loans acquired with deteriorated credit quality | 0 |  | 0 |  |  |
Mortgage Warehousing [Member] | Loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans: Collectively evaluated for impairment | 95,963 |  | 136,207 |  |  |
Total ending loans balance | 95,963 |  | 136,207 |  |  |
Mortgage Warehousing [Member] | Loans [Member] | Loans Purchased With Evidence of Credit Deterioration [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans acquired with deteriorated credit quality | $ 0 |  | $ 0 |  |  |

X
- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition 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. + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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