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FAIR VALUE MEASUREMENTS (Balances Of Financial Assets Measured At Fair Value On Recurring And Nonrecurring) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading account securities $ 0 $ 7,175    
Total securities available for sale 184,373 178,099    
Total loans held for sale 9,952      
Loans servicing rights 2,405 1,389 $ 310 $ 0
Residential mortgage loans held for sale 704,271 586,456    
Derivative assets (included in other assets) 421      
Other real estate owned        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total other real estate owned 103      
Residential real estate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total other real estate owned 1,300 1,600    
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 103      
Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading account securities   7,175    
Total securities available for sale 184,373 178,099    
Derivative assets (included in other assets) 421      
Fair Value, Measurements, Recurring | Residential Mortgage Loans Held For Sale Fair Value Option Elected [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Residential mortgage loans held for sale 9,952      
Fair Value, Measurements, Recurring | Agency mortgage-backed        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total securities available for sale 31,130 36,736    
Fair Value, Measurements, Recurring | Agency CMO        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total securities available for sale 10,441 14,576    
Fair Value, Measurements, Recurring | Privately issued CMO        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total securities available for sale 1,579 2,001    
Fair Value, Measurements, Recurring | Privately-issued ABS        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total securities available for sale 1,884 3,448    
Fair Value, Measurements, Recurring | SBA Certificates        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total securities available for sale 1,351 912    
Fair Value, Measurements, Recurring | Municipal bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total securities available for sale 137,988 120,426    
Fair Value, Measurements, Nonrecurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 12,816 10,841    
Total loans held for sale   25,635    
Loans servicing rights 2,405 1,389    
Total other real estate owned   852    
Fair Value, Measurements, Nonrecurring | Residential real estate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 5,100 4,967    
Fair Value, Measurements, Nonrecurring | Commercial real estate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 7,227 5,477    
Total other real estate owned   260    
Fair Value, Measurements, Nonrecurring | Commercial business        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 231 192    
Fair Value, Measurements, Nonrecurring | Consumer        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 231 175    
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 27 30    
Total other real estate owned   282    
Fair Value, Measurements, Nonrecurring | Small Business Administration Loan [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total loans held for sale 21,659 24,908    
Fair Value, Measurements, Nonrecurring | Residential mortgage loans held for sale [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total loans held for sale   727    
Total other real estate owned   310    
Fair Value, Measurements, Nonrecurring | Residential Mortgage Loans Held For Sale Fair Value Option Not Elected [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Residential mortgage loans held for sale 514      
Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading account securities   0    
Total securities available for sale 0 0    
Loans servicing rights 0 0    
Residential mortgage loans held for sale 0 0    
Derivative assets (included in other assets) 0      
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      
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      
Level 1 | Residential mortgage loans held for sale [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Residential mortgage loans held for sale 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    
Total securities available for sale 0 0    
Derivative assets (included in other assets) 0      
Level 1 | Fair Value, Measurements, Recurring | Residential Mortgage Loans Held For Sale Fair Value Option Elected [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Residential mortgage loans held for sale 0      
Level 1 | Fair Value, Measurements, Recurring | Agency mortgage-backed        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total 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]        
Total 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]        
Total 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]        
Total 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]        
Total securities available for sale 0 0    
Level 1 | Fair Value, Measurements, Recurring | Municipal bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total 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    
Total loans held for sale   0    
Loans servicing rights 0 0    
Total other real estate owned   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    
Total other real estate owned   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    
Total other real estate owned   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]        
Total 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]        
Total loans held for sale   0    
Total other real estate owned   0    
Level 1 | Fair Value, Measurements, Nonrecurring | Residential Mortgage Loans Held For Sale Fair Value Option Not Elected [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Residential mortgage loans held for sale 0      
Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading account securities   7,175    
Total securities available for sale 184,373 178,099    
Loans servicing rights 0 0    
Residential mortgage loans held for sale 0 0    
Derivative assets (included in other assets) 41      
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      
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      
Level 2 | Residential mortgage loans held for sale [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Residential mortgage loans held for sale 10,476 727    
Level 2 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading account securities   7,175    
Total securities available for sale 184,373 178,099    
Derivative assets (included in other assets) 41      
Level 2 | Fair Value, Measurements, Recurring | Residential Mortgage Loans Held For Sale Fair Value Option Elected [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Residential mortgage loans held for sale 9,952      
Level 2 | Fair Value, Measurements, Recurring | Agency mortgage-backed        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total securities available for sale 31,130 36,736    
Level 2 | Fair Value, Measurements, Recurring | Agency CMO        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total securities available for sale 10,441 14,576    
Level 2 | Fair Value, Measurements, Recurring | Privately issued CMO        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total securities available for sale 1,579 2,001    
Level 2 | Fair Value, Measurements, Recurring | Privately-issued ABS        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total securities available for sale 1,884 3,448    
Level 2 | Fair Value, Measurements, Recurring | SBA Certificates        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total securities available for sale 1,351 912    
Level 2 | Fair Value, Measurements, Recurring | Municipal bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total securities available for sale 137,988 120,426    
Level 2 | Fair Value, Measurements, Nonrecurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 0 0    
Total loans held for sale   25,635    
Loans servicing rights 0 0    
Total other real estate owned   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    
Total other real estate owned   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    
Total other real estate owned   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]        
Total loans held for sale 21,659 24,908    
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]        
Total loans held for sale   727    
Total other real estate owned   0    
Level 2 | Fair Value, Measurements, Nonrecurring | Residential Mortgage Loans Held For Sale Fair Value Option Not Elected [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Residential mortgage loans held for sale 514      
Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading account securities   0    
Total securities available for sale 0 0    
Loans servicing rights 2,405 1,456    
Residential mortgage loans held for sale 673,652 579,074    
Derivative assets (included in other assets) 380      
Level 3 | Other real estate owned        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total other real estate owned 103      
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 103      
Level 3 | Residential mortgage loans held for sale [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Residential mortgage loans held for sale 0 0    
Level 3 | Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading account securities   0    
Total securities available for sale 0 0    
Derivative assets (included in other assets) 380      
Level 3 | Fair Value, Measurements, Recurring | Residential Mortgage Loans Held For Sale Fair Value Option Elected [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Residential mortgage loans held for sale 0      
Level 3 | Fair Value, Measurements, Recurring | Agency mortgage-backed        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total 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]        
Total 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]        
Total 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]        
Total 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]        
Total securities available for sale 0 0    
Level 3 | Fair Value, Measurements, Recurring | Municipal bonds        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total 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 12,816 10,841    
Total loans held for sale   0    
Loans servicing rights 2,405 1,389    
Total other real estate owned   852    
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 5,100 4,967    
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 7,227 5,477    
Total other real estate owned   260    
Level 3 | Fair Value, Measurements, Nonrecurring | Commercial business        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 231 192    
Level 3 | Fair Value, Measurements, Nonrecurring | Consumer        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total impaired loans 231 175    
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 27 30    
Total other real estate owned   282    
Level 3 | Fair Value, Measurements, Nonrecurring | Small Business Administration Loan [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total 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]        
Total loans held for sale   0    
Total other real estate owned   $ 310    
Level 3 | Fair Value, Measurements, Nonrecurring | Residential Mortgage Loans Held For Sale Fair Value Option Not Elected [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Residential mortgage loans held for sale $ 0