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Information Relates to Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable Impaired [Line Items]      
Unpaid Contractual Principal Balance $ 27,198 $ 28,376 $ 31,877
Recorded Investment With No Allowance 16,408 13,154 16,445
Recorded Investment With Allowance 8,752 12,921 12,949
Total Recorded Investment 25,160 26,075 29,394
Related Allowance 922 1,373 1,447
Average Recorded Investment 25,545 28,641 34,862
Interest Income Recognized on Cash Basis 1,080 981 1,389
Business      
Financing Receivable Impaired [Line Items]      
Unpaid Contractual Principal Balance 667 672 891
Recorded Investment With No Allowance 529 605 755
Recorded Investment With Allowance 96 10 71
Total Recorded Investment 625 615 826
Related Allowance 2 10 1
Average Recorded Investment 594 748 993
Interest Income Recognized on Cash Basis 24 24 44
Consumer      
Financing Receivable Impaired [Line Items]      
Average Recorded Investment     2
Interest Income Recognized on Cash Basis     3
Construction and Land      
Financing Receivable Impaired [Line Items]      
Unpaid Contractual Principal Balance 1,233 1,241 662
Recorded Investment With No Allowance 1,075 1,145 637
Total Recorded Investment 1,075 1,145 637
Related Allowance 39    
Average Recorded Investment 1,042 912 931
Interest Income Recognized on Cash Basis     45
1-4 Family      
Financing Receivable Impaired [Line Items]      
Unpaid Contractual Principal Balance 20,036 19,367 23,060
Recorded Investment With No Allowance 10,651 7,507 11,025
Recorded Investment With Allowance 8,161 10,349 10,235
Total Recorded Investment 18,812 17,856 21,260
Related Allowance 506 1,102 1,169
Average Recorded Investment 18,512 20,131 24,797
Interest Income Recognized on Cash Basis 890 722 993
Multifamily      
Financing Receivable Impaired [Line Items]      
Unpaid Contractual Principal Balance 533    
Recorded Investment With No Allowance 520    
Total Recorded Investment 520    
Related Allowance 375    
Average Recorded Investment 166 309 1,544
Interest Income Recognized on Cash Basis     2
Nonresidential Properties      
Financing Receivable Impaired [Line Items]      
Unpaid Contractual Principal Balance 4,729 7,096 7,264
Recorded Investment With No Allowance 3,633 3,897 4,028
Recorded Investment With Allowance 495 2,562 2,643
Total Recorded Investment 4,128 6,459 6,671
Related Allowance   261 277
Average Recorded Investment 5,231 6,541 6,595
Interest Income Recognized on Cash Basis $ 166 $ 235 $ 302