Fair Value Measurements and Disclosures about Fair Value of Financial Instruments (Balances Of Financial Assets Measured At Fair Value On Recurring And Nonrecurring) (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Trading account securities | $ 9,138 | $ 9,255 | | |
Securities available for sale | 173,359 | 174,493 | | |
Loans servicing rights | 559 | 310 | $ 156 | $ 0 |
Other real estate owned | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total other real estate owned | 553 | 519 | | |
Residential real estate | Other real estate owned | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total other real estate owned | 349 | 397 | | |
Commercial real estate | Other real estate owned | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total other real estate owned | 204 | 122 | | |
Fair Value, Measurements, Recurring | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Trading account securities | 9,138 | 9,255 | | |
Securities available for sale | 173,359 | 174,493 | | |
Fair Value, Measurements, Recurring | Agency bonds and notes | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 1,016 | 1,032 | | |
Fair Value, Measurements, Recurring | Agency mortgage-backed | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 42,974 | 47,405 | | |
Fair Value, Measurements, Recurring | Agency CMO | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 15,345 | 16,095 | | |
Fair Value, Measurements, Recurring | Privately-issued CMO | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 2,507 | 2,652 | | |
Fair Value, Measurements, Recurring | Privately-issued ABS | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 4,246 | 4,532 | | |
Fair Value, Measurements, Recurring | SBA Certificates | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 1,164 | 1,227 | | |
Fair Value, Measurements, Recurring | Municipal obligations | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 106,107 | 101,550 | | |
Fair Value, Measurements, Nonrecurring | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 11,183 | 11,313 | | |
Loans held for sale | 17,053 | 5,471 | | |
Loans servicing rights | 559 | 310 | | |
Fair Value, Measurements, Nonrecurring | Residential real estate | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 4,238 | 4,299 | | |
Fair Value, Measurements, Nonrecurring | Commercial real estate | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 6,213 | 6,298 | | |
Fair Value, Measurements, Nonrecurring | Commercial business | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 208 | 231 | | |
Fair Value, Measurements, Nonrecurring | Consumer | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 253 | 244 | | |
Fair Value, Measurements, Nonrecurring | Land and Land Development [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 271 | 241 | | |
Fair Value, Measurements, Nonrecurring | Small Business Administration Loan [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Loans held for sale | 16,178 | 5,087 | | |
Fair Value, Measurements, Nonrecurring | Residential mortgage loans held for sale [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Loans held for sale | 875 | 384 | | |
Level 1 | Other real estate owned | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total other real estate owned | 0 | 0 | | |
Level 1 | Residential real estate | Other real estate owned | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total other real estate owned | 0 | 0 | | |
Level 1 | Commercial real estate | Other real estate owned | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total other real estate owned | 0 | 0 | | |
Level 1 | Fair Value, Measurements, Recurring | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Trading account securities | 0 | 0 | | |
Securities available for sale | 0 | 0 | | |
Level 1 | Fair Value, Measurements, Recurring | Agency bonds and notes | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 0 | 0 | | |
Level 1 | Fair Value, Measurements, Recurring | Agency mortgage-backed | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 0 | 0 | | |
Level 1 | Fair Value, Measurements, Recurring | Agency CMO | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 0 | 0 | | |
Level 1 | Fair Value, Measurements, Recurring | Privately-issued CMO | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 0 | 0 | | |
Level 1 | Fair Value, Measurements, Recurring | Privately-issued ABS | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 0 | 0 | | |
Level 1 | Fair Value, Measurements, Recurring | SBA Certificates | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 0 | 0 | | |
Level 1 | Fair Value, Measurements, Recurring | Municipal obligations | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 0 | 0 | | |
Level 1 | Fair Value, Measurements, Nonrecurring | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 0 | 0 | | |
Loans held for sale | 0 | 0 | | |
Loans servicing rights | 0 | 0 | | |
Level 1 | Fair Value, Measurements, Nonrecurring | Residential real estate | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 0 | 0 | | |
Level 1 | Fair Value, Measurements, Nonrecurring | Commercial real estate | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 0 | 0 | | |
Level 1 | Fair Value, Measurements, Nonrecurring | Commercial business | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 0 | 0 | | |
Level 1 | Fair Value, Measurements, Nonrecurring | Consumer | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 0 | 0 | | |
Level 1 | Fair Value, Measurements, Nonrecurring | Land and Land Development [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 0 | 0 | | |
Level 1 | Fair Value, Measurements, Nonrecurring | Small Business Administration Loan [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Loans held for sale | 0 | 0 | | |
Level 1 | Fair Value, Measurements, Nonrecurring | Residential mortgage loans held for sale [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Loans held for sale | 0 | 0 | | |
Level 2 | Other real estate owned | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total other real estate owned | 0 | 0 | | |
Level 2 | Residential real estate | Other real estate owned | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total other real estate owned | 0 | 0 | | |
Level 2 | Commercial real estate | Other real estate owned | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total other real estate owned | 0 | 0 | | |
Level 2 | Fair Value, Measurements, Recurring | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Trading account securities | 9,138 | 9,255 | | |
Securities available for sale | 173,359 | 174,493 | | |
Level 2 | Fair Value, Measurements, Recurring | Agency bonds and notes | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 1,016 | 1,032 | | |
Level 2 | Fair Value, Measurements, Recurring | Agency mortgage-backed | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 42,974 | 47,405 | | |
Level 2 | Fair Value, Measurements, Recurring | Agency CMO | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 15,345 | 16,095 | | |
Level 2 | Fair Value, Measurements, Recurring | Privately-issued CMO | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 2,507 | 2,652 | | |
Level 2 | Fair Value, Measurements, Recurring | Privately-issued ABS | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 4,246 | 4,532 | | |
Level 2 | Fair Value, Measurements, Recurring | SBA Certificates | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 1,164 | 1,227 | | |
Level 2 | Fair Value, Measurements, Recurring | Municipal obligations | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 106,107 | 101,550 | | |
Level 2 | Fair Value, Measurements, Nonrecurring | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 0 | 0 | | |
Loans held for sale | 17,053 | 5,471 | | |
Loans servicing rights | 0 | 0 | | |
Level 2 | Fair Value, Measurements, Nonrecurring | Residential real estate | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 0 | 0 | | |
Level 2 | Fair Value, Measurements, Nonrecurring | Commercial real estate | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 0 | 0 | | |
Level 2 | Fair Value, Measurements, Nonrecurring | Commercial business | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 0 | 0 | | |
Level 2 | Fair Value, Measurements, Nonrecurring | Consumer | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 0 | 0 | | |
Level 2 | Fair Value, Measurements, Nonrecurring | Land and Land Development [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 0 | 0 | | |
Level 2 | Fair Value, Measurements, Nonrecurring | Small Business Administration Loan [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Loans held for sale | 16,178 | 5,087 | | |
Level 2 | Fair Value, Measurements, Nonrecurring | Residential mortgage loans held for sale [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Loans held for sale | 875 | 384 | | |
Level 3 | Other real estate owned | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total other real estate owned | 553 | 19 | | |
Level 3 | Residential real estate | Other real estate owned | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total other real estate owned | 349 | 397 | | |
Level 3 | Commercial real estate | Other real estate owned | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total other real estate owned | 204 | 122 | | |
Level 3 | Fair Value, Measurements, Recurring | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Trading account securities | 0 | 0 | | |
Securities available for sale | 0 | 0 | | |
Level 3 | Fair Value, Measurements, Recurring | Agency bonds and notes | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 0 | 0 | | |
Level 3 | Fair Value, Measurements, Recurring | Agency mortgage-backed | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 0 | 0 | | |
Level 3 | Fair Value, Measurements, Recurring | Agency CMO | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 0 | 0 | | |
Level 3 | Fair Value, Measurements, Recurring | Privately-issued CMO | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 0 | 0 | | |
Level 3 | Fair Value, Measurements, Recurring | Privately-issued ABS | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 0 | 0 | | |
Level 3 | Fair Value, Measurements, Recurring | SBA Certificates | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 0 | 0 | | |
Level 3 | Fair Value, Measurements, Recurring | Municipal obligations | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Securities available for sale | 0 | 0 | | |
Level 3 | Fair Value, Measurements, Nonrecurring | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 11,183 | 11,313 | | |
Loans held for sale | 0 | 0 | | |
Loans servicing rights | 559 | 310 | | |
Level 3 | Fair Value, Measurements, Nonrecurring | Residential real estate | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 4,238 | 4,299 | | |
Level 3 | Fair Value, Measurements, Nonrecurring | Commercial real estate | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 6,213 | 6,298 | | |
Level 3 | Fair Value, Measurements, Nonrecurring | Commercial business | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 208 | 231 | | |
Level 3 | Fair Value, Measurements, Nonrecurring | Consumer | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 253 | 244 | | |
Level 3 | Fair Value, Measurements, Nonrecurring | Land and Land Development [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Total impaired loans | 271 | 241 | | |
Level 3 | Fair Value, Measurements, Nonrecurring | Small Business Administration Loan [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Loans held for sale | 0 | 0 | | |
Level 3 | Fair Value, Measurements, Nonrecurring | Residential mortgage loans held for sale [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Loans held for sale | $ 0 | $ 0 | | |