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Allowance for Loan Losses - Balance Of The Allowance Segregated By Segment And Class (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment $ 372     $ 1,514    
Collectively evaluated for impairment 19,788     19,950    
Allowance for credit losses 20,160 $ 20,108 $ 21,461 21,464 $ 20,061 $ 19,697
AQR Substandard            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 372   966      
Collectively evaluated for impairment 19   8      
AQR Pass            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 16,354   16,453      
AQR Special Mention            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 823   524      
Unallocated            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 2,592   3,510      
Commercial            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 323     1,514    
Collectively evaluated for impairment 5,614     5,502    
Allowance for credit losses 5,937 5,626 6,172 7,016 5,822 5,535
Commercial | AQR Substandard            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 323   966      
Collectively evaluated for impairment 0   7      
Commercial | AQR Pass            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 5,435   5,079      
Commercial | AQR Special Mention            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 179   120      
Commercial | Unallocated            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 0   0      
Real estate construction one-to-four family            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0     0    
Collectively evaluated for impairment 675     600    
Allowance for credit losses 675 596 629 600 521 550
Real estate construction one-to-four family | AQR Substandard            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 0   0      
Real estate construction one-to-four family | AQR Pass            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 675   629      
Real estate construction one-to-four family | AQR Special Mention            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 0   0      
Real estate construction one-to-four family | Unallocated            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 0   0      
Real estate construction other            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0     0    
Collectively evaluated for impairment 1,120     1,778    
Allowance for credit losses 1,120 1,086 1,566 1,778 1,517 1,465
Real estate construction other | AQR Substandard            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 0   0      
Real estate construction other | AQR Pass            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 1,120   1,566      
Real estate construction other | AQR Special Mention            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 0   0      
Real estate construction other | Unallocated            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 0   0      
Real estate term owner occupied            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0     0    
Collectively evaluated for impairment 2,127     2,344    
Allowance for credit losses 2,127 2,170 2,194 2,344 2,354 2,358
Real estate term owner occupied | AQR Substandard            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 0   0      
Real estate term owner occupied | AQR Pass            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 2,065   2,154      
Real estate term owner occupied | AQR Special Mention            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 62   40      
Real estate term owner occupied | Unallocated            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 0   0      
Real estate term non-owner occupied            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0     0    
Collectively evaluated for impairment 6,208     7,015    
Allowance for credit losses 6,208 6,219 6,043 7,015 7,075 6,853
Real estate term non-owner occupied | AQR Substandard            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 0   0      
Real estate term non-owner occupied | AQR Pass            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 5,631   5,680      
Real estate term non-owner occupied | AQR Special Mention            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 577   363      
Real estate term non-owner occupied | Unallocated            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 0   0      
Real estate term other            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0     0    
Collectively evaluated for impairment 711     784    
Allowance for credit losses 711 1,001 725 784 774 819
Real estate term other | AQR Substandard            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 0   0      
Real estate term other | AQR Pass            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 711   725      
Real estate term other | AQR Special Mention            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 0   0      
Real estate term other | Unallocated            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 0   0      
Consumer secured by 1st deeds of trust            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 49     0    
Collectively evaluated for impairment 325     335    
Allowance for credit losses 374 352 315 335 327 313
Consumer secured by 1st deeds of trust | AQR Substandard            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 49   0      
Collectively evaluated for impairment 0   0      
Consumer secured by 1st deeds of trust | AQR Pass            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 320   315      
Consumer secured by 1st deeds of trust | AQR Special Mention            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 5   0      
Consumer secured by 1st deeds of trust | Unallocated            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 0   0      
Consumer other            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0     0    
Collectively evaluated for impairment 416     364    
Allowance for credit losses 416 396 307 364 362 408
Consumer other | AQR Substandard            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 19   1      
Consumer other | AQR Pass            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 397   305      
Consumer other | AQR Special Mention            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 0   1      
Consumer other | Unallocated            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 0   0      
Unallocated            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0     0    
Collectively evaluated for impairment 2,592     1,228    
Allowance for credit losses 2,592 $ 2,662 3,510 $ 1,228 $ 1,309 $ 1,396
Unallocated | AQR Substandard            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 0   0      
Unallocated | AQR Pass            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 0   0      
Unallocated | AQR Special Mention            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 0   0      
Unallocated | Unallocated            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment $ 2,592   $ 3,510