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Allowance for Loan Losses - Balance Of The Allowance Segregated By Segment And Class (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment $ 73     $ 394    
Collectively evaluated for impairment 20,035     19,667    
Allowance for credit losses 20,108 $ 20,449 $ 21,461 20,061 $ 19,893 $ 19,697
AQR Substandard            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 73   966      
Collectively evaluated for impairment 22   8      
AQR Pass            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 16,557   16,453      
AQR Special Mention            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 794   524      
Unallocated            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 2,662   3,510      
Commercial            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 73     394    
Collectively evaluated for impairment 5,553     5,428    
Allowance for credit losses 5,626 5,684 6,172 5,822 5,701 5,535
Commercial | AQR Substandard            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 73   966      
Collectively evaluated for impairment 0   7      
Commercial | AQR Pass            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 5,453   5,079      
Commercial | AQR Special Mention            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 100   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 596     521    
Allowance for credit losses 596 608 629 521 549 550
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 596   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 1,086     1,517    
Allowance for credit losses 1,086 1,069 1,566 1,517 1,383 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 1,086   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 2,170     2,354    
Allowance for credit losses 2,170 2,174 2,194 2,354 2,372 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 2,089   2,154      
Real estate term owner occupied | AQR Special Mention            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 81   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 6,219     7,075    
Allowance for credit losses 6,219 6,379 6,043 7,075 7,207 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 5,627   5,680      
Real estate term non-owner occupied | AQR Special Mention            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 592   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 1,001     774    
Allowance for credit losses 1,001 1,025 725 774 774 819
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 990   725      
Real estate term other | AQR Special Mention            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 11   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 0     0    
Collectively evaluated for impairment 352     327    
Allowance for credit losses 352 305 315 327 311 313
Consumer secured by 1st deeds of trust | AQR Substandard            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   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 343   315      
Consumer secured by 1st deeds of trust | AQR Special Mention            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 9   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 396     362    
Allowance for credit losses 396 315 307 362 391 408
Consumer other | AQR Substandard            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 22   1      
Consumer other | AQR Pass            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 373   305      
Consumer other | AQR Special Mention            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Collectively evaluated for impairment 1   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 2,662     1,309    
Allowance for credit losses 2,662 $ 2,890 3,510 $ 1,309 $ 1,205 $ 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 $ 2,662   $ 3,510