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Loans Receivable and Allowance for Loan Losses (Narrative) (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) Contract | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) SecurityLoan borrower troubled_debt_restructuring Contract | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) SecurityLoan Contract | Dec. 31, 2016 USD ($) SecurityLoan borrower troubled_debt_restructuring Contract | May 30, 2014 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Principal amount of nonaccrual loans | $ 36,400,000 |  | $ 36,400,000 |  | $ 36,400,000 | $ 42,400,000 |
Loans less than 90 days past due | $ 9,100,000 |  | $ 9,100,000 |  | $ 9,100,000 | $ 7,300,000 |
Number of loans 90 days past due and still accruing | Contract | 0 |  | 0 |  | 0 | 0 |
Impaired loan defined floor limit (greater than) | $ 1,000,000.0 |  | $ 1,000,000.0 |  | $ 1,000,000.0 |  |
Impaired loans number | SecurityLoan |  |  | 145 |  |  | 141 |
Impaired loans | 50,181,000 |  | $ 50,181,000 |  | 50,181,000 | $ 52,019,000 |
Number of troubled debt restructurings | troubled_debt_restructuring |  |  | 126 |  |  | 114 |
Number of borrowers | borrower |  |  | 122 |  |  | 110 |
Loans and leases receivable, impaired, nonperforming, accrual of interest | 31,700,000 |  | $ 31,700,000 |  | $ 31,700,000 | $ 29,900,000 |
Charge off, impaired loan | $ 3,200,000 | $ 0 | $ 4,400,000 | $ 0 |  |  |
Weighted average modified interest rate | 4.36% |  | 4.02% |  |  |  |
Weighted average prior modification rate | 4.33% |  | 3.93% |  |  |  |
Number of payment defaults for loans modified as TDRs | SecurityLoan |  |  |  |  | 0 |  |
Allowances for loan losses | $ 2,872,000 |  | $ 2,872,000 |  | $ 2,872,000 | 2,334,000 |
Impaired financing receivable with no related allowance | 29,700,000 |  | 29,700,000 |  | 29,700,000 | 31,800,000 |
Average balance of impaired loans |  |  | 51,198,000 |  |  | 52,002,000 |
Team Capital Bank [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value of acquired loans |  |  |  |  |  |  | $ 5,200,000
Balance of PCI loans | 1,000,000 |  | 1,000,000 |  | $ 1,000,000 | $ 1,300,000 |
Impaired Loans Troubled Debt Restructurings [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Allowances for loan losses | $ 0 |  | $ 120,000 |  |  |  |

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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 + Details
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