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Recent Accounting Pronouncements (Narrative) (Details)
 3 Months Ended
Dec. 31, 2019
USD ($)
security
Jan. 01, 2019
USD ($)
Location
Lease
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Operating lease right of use asset $ 11,442,000      
Operating lease liability 12,544,000      
Finance lease right of use asset 3,447,000      
Finance lease liability $ 3,551,000      
ASU 2019-04 [Member]        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Number of held-to-maturity debt securities | security 113      
Debt securities, held-to-maturity with an aggregate amortized cost $ 67,096,000      
Number of held-to-maturity debt securities sold | security 113      
Gain (Loss) on sale of debt securities $ 1,779,000      
ASU 2016-02 [Member]        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Operating lease right of use asset   $ 11,661,000    
Operating lease liability   12,866,000    
Opening adjustment to retaining earnings   $ 316,000    
Number of retail branch locations which deferred sale/lease back gain recorded | Location   2    
Number of leased properties | Lease   24    
Finance lease right of use asset 3,597,000      
Finance lease liability $ 3,597,000      
Finance Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtMember      
One-time cumulative-effect adjustment based upon adoption     $ 316,000  
ASU 2016-02 [Member] | Retained Earnings [Member]        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
One-time cumulative-effect adjustment based upon adoption     $ 316,000  
ASU 2016-01 [Member]        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
One-time cumulative-effect adjustment based upon adoption       $ (9,000)
ASU 2016-01 [Member] | Deferred Tax Assets [Member]        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
One-time cumulative-effect adjustment based upon adoption       (9,000)
ASU 2016-01 [Member] | Retained Earnings [Member]        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
One-time cumulative-effect adjustment based upon adoption       (44,000)
ASU 2016-01 [Member] | Accumulated Other Comprehensive Loss [Member]        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
One-time cumulative-effect adjustment based upon adoption       $ 35,000