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Loans Receivable - Non-accrual and Past Due Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Financing Receivable, Past Due [Line Items]      
Loans past due after interest is not received 30 days    
Period past due when interest is discontinued 90 days    
Contractual performance period of nonaccrual loans to be restored to accrual status 6 months    
Total loans $ 261,575 $ 264,658 $ 271,994
Non-accrual loans 3,112 3,264  
Number of loans past due more than ninety days and still accruing 0 0  
Total outstanding TDR 2,900 3,000  
Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 12,197 10,763  
30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 8,594 5,885  
60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 491 1,614  
90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 3,112 3,264  
Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 249,378 253,895  
Residential      
Financing Receivable, Past Due [Line Items]      
Total loans 111,291 113,061  
Non-accrual loans 2,267 2,577  
Residential | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 5,697 6,857  
Residential | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 3,430 3,455  
Residential | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   825  
Residential | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 2,267 2,577  
Residential | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 105,594 106,204  
Residential | One- to four-family      
Financing Receivable, Past Due [Line Items]      
Total loans 111,291 113,061 122,533
Total outstanding TDR 250    
Residential | One- to four-family | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 5,697 6,857  
Residential | One- to four-family | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 3,430 3,455  
Residential | One- to four-family | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   825  
Residential | One- to four-family | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 2,267 2,577  
Residential | One- to four-family | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 105,594 106,204  
Residential | 1-4 family first-lien      
Financing Receivable, Past Due [Line Items]      
Non-accrual loans 2,267 2,577  
Commercial      
Financing Receivable, Past Due [Line Items]      
Total loans 33,607 34,462  
Non-accrual loans 550 577  
Commercial | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 3,732 1,001  
Commercial | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 3,182 416  
Commercial | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   8  
Commercial | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 550 577  
Commercial | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 29,875 33,461  
Commercial | Real estate - nonresidential      
Financing Receivable, Past Due [Line Items]      
Total loans 20,857 21,478 24,405
Non-accrual loans 416 416  
Commercial | Real estate - nonresidential | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 3,271 805  
Commercial | Real estate - nonresidential | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 2,855 389  
Commercial | Real estate - nonresidential | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 416 416  
Commercial | Real estate - nonresidential | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 17,586 20,673  
Commercial | Multi-family      
Financing Receivable, Past Due [Line Items]      
Total loans 452 456 2,331
Commercial | Multi-family | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 452 456  
Commercial | Commercial business      
Financing Receivable, Past Due [Line Items]      
Total loans 12,298 12,528 19,576
Non-accrual loans 134 161  
Total outstanding TDR 34    
Commercial | Commercial business | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 461 196  
Commercial | Commercial business | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 327 27  
Commercial | Commercial business | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   8  
Commercial | Commercial business | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 134 161  
Commercial | Commercial business | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 11,837 12,332  
Consumer      
Financing Receivable, Past Due [Line Items]      
Total loans 116,677 117,135  
Non-accrual loans 295 110  
Consumer | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 2,768 2,905  
Consumer | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 1,982 2,014  
Consumer | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 491 781  
Consumer | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 295 110  
Consumer | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 113,909 114,230  
Consumer | Home equity and junior liens      
Financing Receivable, Past Due [Line Items]      
Total loans 10,433 9,701 10,365
Non-accrual loans 112 66  
Consumer | Home equity and junior liens | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 275 246  
Consumer | Home equity and junior liens | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 163 149  
Consumer | Home equity and junior liens | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   31  
Consumer | Home equity and junior liens | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 112 66  
Consumer | Home equity and junior liens | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 10,158 9,455  
Consumer | Manufactured homes      
Financing Receivable, Past Due [Line Items]      
Total loans 48,116 47,717 46,608
Non-accrual loans 44    
Consumer | Manufactured homes | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 1,052 1,537  
Consumer | Manufactured homes | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 742 922  
Consumer | Manufactured homes | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 266 615  
Consumer | Manufactured homes | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 44    
Consumer | Manufactured homes | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 47,064 46,180  
Consumer | Automobile      
Financing Receivable, Past Due [Line Items]      
Total loans 22,025 22,666 22,421
Non-accrual loans 15 44  
Consumer | Automobile | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 234 276  
Consumer | Automobile | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 219 168  
Consumer | Automobile | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   64  
Consumer | Automobile | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 15 44  
Consumer | Automobile | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 21,791 22,390  
Consumer | Student      
Financing Receivable, Past Due [Line Items]      
Total loans 2,102 2,096 2,304
Non-accrual loans 75    
Consumer | Student | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 95 95  
Consumer | Student | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   95  
Consumer | Student | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 20    
Consumer | Student | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 75    
Consumer | Student | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 2,007 2,001  
Consumer | Recreational Vehicle      
Financing Receivable, Past Due [Line Items]      
Total loans 28,692 29,463 17,043
Non-accrual loans 49    
Consumer | Recreational Vehicle | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 1,034 644  
Consumer | Recreational Vehicle | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 780 605  
Consumer | Recreational Vehicle | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 205 39  
Consumer | Recreational Vehicle | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 49    
Consumer | Recreational Vehicle | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 27,658 28,819  
Consumer | Other consumer      
Financing Receivable, Past Due [Line Items]      
Total loans 5,309 5,492 $ 4,408
Consumer | Other consumer | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 78 107  
Consumer | Other consumer | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 78 75  
Consumer | Other consumer | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   32  
Consumer | Other consumer | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 5,231 5,385  
Originated      
Financing Receivable, Past Due [Line Items]      
Total loans 249,241 251,512  
Originated | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 11,672 10,115  
Originated | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 8,225 5,540  
Originated | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 491 1,546  
Originated | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 2,956 3,029  
Originated | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 237,569 241,397  
Originated | Residential      
Financing Receivable, Past Due [Line Items]      
Total loans 101,613 102,766  
Originated | Residential | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 5,207 6,256  
Originated | Residential | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 3,096 3,137  
Originated | Residential | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   757  
Originated | Residential | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 2,111 2,362  
Originated | Residential | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 96,406 96,510  
Originated | Residential | One- to four-family      
Financing Receivable, Past Due [Line Items]      
Total loans 101,613 102,766  
Originated | Residential | One- to four-family | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 5,207 6,256  
Originated | Residential | One- to four-family | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 3,096 3,137  
Originated | Residential | One- to four-family | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   757  
Originated | Residential | One- to four-family | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 2,111 2,362  
Originated | Residential | One- to four-family | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 96,406 96,510  
Originated | Commercial      
Financing Receivable, Past Due [Line Items]      
Total loans 31,788 32,556  
Originated | Commercial | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 3,732 974  
Originated | Commercial | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 3,182 389  
Originated | Commercial | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   8  
Originated | Commercial | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 550 577  
Originated | Commercial | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 28,056 31,582  
Originated | Commercial | Real estate - nonresidential      
Financing Receivable, Past Due [Line Items]      
Total loans 19,164 19,734  
Originated | Commercial | Real estate - nonresidential | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 3,271 805  
Originated | Commercial | Real estate - nonresidential | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 2,855 389  
Originated | Commercial | Real estate - nonresidential | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 416 416  
Originated | Commercial | Real estate - nonresidential | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 15,893 18,929  
Originated | Commercial | Multi-family      
Financing Receivable, Past Due [Line Items]      
Total loans 452 456  
Originated | Commercial | Multi-family | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 452 456  
Originated | Commercial | Commercial business      
Financing Receivable, Past Due [Line Items]      
Total loans 12,172 12,366  
Originated | Commercial | Commercial business | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 461 169  
Originated | Commercial | Commercial business | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 327    
Originated | Commercial | Commercial business | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   8  
Originated | Commercial | Commercial business | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 134 161  
Originated | Commercial | Commercial business | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 11,711 12,197  
Originated | Consumer      
Financing Receivable, Past Due [Line Items]      
Total loans 115,840 116,190  
Originated | Consumer | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 2,733 2,885  
Originated | Consumer | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 1,947 2,014  
Originated | Consumer | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 491 781  
Originated | Consumer | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 295 90  
Originated | Consumer | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 113,107 113,305  
Originated | Consumer | Home equity and junior liens      
Financing Receivable, Past Due [Line Items]      
Total loans 9,663 8,840  
Originated | Consumer | Home equity and junior liens | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 240 226  
Originated | Consumer | Home equity and junior liens | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 128 149  
Originated | Consumer | Home equity and junior liens | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   31  
Originated | Consumer | Home equity and junior liens | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 112 46  
Originated | Consumer | Home equity and junior liens | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 9,423 8,614  
Originated | Consumer | Manufactured homes      
Financing Receivable, Past Due [Line Items]      
Total loans 48,116 47,717  
Originated | Consumer | Manufactured homes | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 1,052 1,537  
Originated | Consumer | Manufactured homes | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 742 922  
Originated | Consumer | Manufactured homes | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 266 615  
Originated | Consumer | Manufactured homes | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 44    
Originated | Consumer | Manufactured homes | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 47,064 46,180  
Originated | Consumer | Automobile      
Financing Receivable, Past Due [Line Items]      
Total loans 22,025 22,666  
Originated | Consumer | Automobile | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 234 276  
Originated | Consumer | Automobile | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 219 168  
Originated | Consumer | Automobile | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   64  
Originated | Consumer | Automobile | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 15 44  
Originated | Consumer | Automobile | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 21,791 22,390  
Originated | Consumer | Student      
Financing Receivable, Past Due [Line Items]      
Total loans 2,102 2,096  
Originated | Consumer | Student | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 95 95  
Originated | Consumer | Student | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   95  
Originated | Consumer | Student | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 20    
Originated | Consumer | Student | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 75    
Originated | Consumer | Student | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 2,007 2,001  
Originated | Consumer | Recreational Vehicle      
Financing Receivable, Past Due [Line Items]      
Total loans 28,692 29,463  
Originated | Consumer | Recreational Vehicle | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 1,034 644  
Originated | Consumer | Recreational Vehicle | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 780 605  
Originated | Consumer | Recreational Vehicle | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 205 39  
Originated | Consumer | Recreational Vehicle | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 49    
Originated | Consumer | Recreational Vehicle | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 27,658 28,819  
Originated | Consumer | Other consumer      
Financing Receivable, Past Due [Line Items]      
Total loans 5,242 5,408  
Originated | Consumer | Other consumer | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 78 107  
Originated | Consumer | Other consumer | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 78 75  
Originated | Consumer | Other consumer | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   32  
Originated | Consumer | Other consumer | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 5,164 5,301  
Acquired      
Financing Receivable, Past Due [Line Items]      
Total loans 12,334 13,146  
Acquired | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 525 648  
Acquired | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 369 345  
Acquired | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   68  
Acquired | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 156 235  
Acquired | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 11,809 12,498  
Acquired | Residential      
Financing Receivable, Past Due [Line Items]      
Total loans 9,678 10,295  
Acquired | Residential | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 490 601  
Acquired | Residential | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 334 318  
Acquired | Residential | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   68  
Acquired | Residential | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 156 215  
Acquired | Residential | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 9,188 9,694  
Acquired | Residential | One- to four-family      
Financing Receivable, Past Due [Line Items]      
Total loans 9,678 10,295  
Acquired | Residential | One- to four-family | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 490 601  
Acquired | Residential | One- to four-family | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 334 318  
Acquired | Residential | One- to four-family | 60-89 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   68  
Acquired | Residential | One- to four-family | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 156 215  
Acquired | Residential | One- to four-family | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 9,188 9,694  
Acquired | Commercial      
Financing Receivable, Past Due [Line Items]      
Total loans 1,819 1,906  
Acquired | Commercial | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 1,819    
Acquired | Commercial | Other commercial and industrial      
Financing Receivable, Past Due [Line Items]      
Total loans   1,906  
Acquired | Commercial | Other commercial and industrial | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   27  
Acquired | Commercial | Other commercial and industrial | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   27  
Acquired | Commercial | Other commercial and industrial | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans   1,879  
Acquired | Commercial | Real estate - nonresidential      
Financing Receivable, Past Due [Line Items]      
Total loans 1,693 1,744  
Acquired | Commercial | Real estate - nonresidential | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 1,693 1,744  
Acquired | Commercial | Commercial business      
Financing Receivable, Past Due [Line Items]      
Total loans 126 162  
Acquired | Commercial | Commercial business | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   27  
Acquired | Commercial | Commercial business | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   27  
Acquired | Commercial | Commercial business | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 126 135  
Acquired | Consumer      
Financing Receivable, Past Due [Line Items]      
Total loans 837 945  
Acquired | Consumer | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 35 20  
Acquired | Consumer | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 35    
Acquired | Consumer | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   20  
Acquired | Consumer | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 802 925  
Acquired | Consumer | Home equity and junior liens      
Financing Receivable, Past Due [Line Items]      
Total loans 770 861  
Acquired | Consumer | Home equity and junior liens | Total Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 35 20  
Acquired | Consumer | Home equity and junior liens | 30-59 Days Past Due      
Financing Receivable, Past Due [Line Items]      
Loans 35    
Acquired | Consumer | Home equity and junior liens | 90 Days or More Past Due      
Financing Receivable, Past Due [Line Items]      
Loans   20  
Acquired | Consumer | Home equity and junior liens | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans 735 841  
Acquired | Consumer | Other consumer      
Financing Receivable, Past Due [Line Items]      
Total loans 67 84  
Acquired | Consumer | Other consumer | Total Loans Current      
Financing Receivable, Past Due [Line Items]      
Loans $ 67 $ 84