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Loans, Credit Scores by Loan Class, Mortgage and Installment Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Loan ratings/credit scores by loan class [Abstract]            
Accrued interest included in total [1]           $ 8,899
Other Real Estate and Foreclosed Assets [Abstract]            
Foreclosed residential real estate properties $ 300     $ 300   700
Retail mortgage loans in process of foreclosure 300     300   300
Sale of Mortgage Loans [Abstract]            
Proceeds from sale of loans       0 $ 2,395  
Gain on sale of loans $ 9,091 $ 17,642   $ 21,919 $ 26,482  
Residential Fixed Rate Mortgage Loans [Member] | Freddie Mac [Member]            
Sale of Mortgage Loans [Abstract]            
Proceeds from sale of loans     $ 26,300      
Gain on sale of loans     720      
Mortgage [Member]            
Loan ratings/credit scores by loan class [Abstract]            
800 and above           148,768
750-799           445,611
700-749           241,589
650-699           115,484
600-649           38,341
550-599           15,934
500-549           11,309
Under 500           3,068
Total           1,020,104
Accrued interest included in total [1]           4,178
Mortgage [Member] | Residential Fixed Rate Mortgage Loans [Member]            
Sale of Mortgage Loans [Abstract]            
Proceeds from sale of loans     2,400      
Gain on sale of loans     $ 70      
Mortgage [Member] | 1-4 Family Owner Occupied - Jumbo [Member]            
Loan ratings/credit scores by loan class [Abstract]            
800 and above           61,077
750-799           223,177
700-749           101,086
650-699           40,296
600-649           11,146
550-599           0
500-549           3,396
Under 500           0
Total           440,178
Accrued interest included in total           1,301
Mortgage [Member] | 1-4 Family Owner Occupied - Non-jumbo [Member]            
Loan ratings/credit scores by loan class [Abstract]            
800 and above           40,187
750-799           70,642
700-749           75,489
650-699           44,344
600-649           18,519
550-599           11,021
500-549           5,129
Under 500           2,242
Total           267,573
Accrued interest included in total           1,641
Mortgage [Member] | 1-4 Non-owner Occupied [Member]            
Loan ratings/credit scores by loan class [Abstract]            
800 and above           25,468
750-799           82,124
700-749           30,326
650-699           13,182
600-649           4,303
550-599           2,388
500-549           1,580
Under 500           405
Total           159,776
Accrued interest included in total           587
Mortgage [Member] | 1-4 Family - 2nd Lien [Member]            
Loan ratings/credit scores by loan class [Abstract]            
800 and above           12,490
750-799           42,138
700-749           22,962
650-699           11,269
600-649           2,703
550-599           1,608
500-549           1,012
Under 500           348
Total           94,530
Accrued interest included in total           373
Mortgage [Member] | Resort Lending [Member]            
Loan ratings/credit scores by loan class [Abstract]            
800 and above           9,546
750-799           27,530
700-749           11,726
650-699           6,393
600-649           1,670
550-599           917
500-549           192
Under 500           73
Total           58,047
Accrued interest included in total           276
Installment [Member]            
Loan ratings/credit scores by loan class [Abstract]            
800 and above           70,608
750-799           257,091
700-749           96,961
650-699           40,121
600-649           7,118
550-599           2,511
500-549           1,392
Under 500           210
Unknown           510
Total           476,522
Accrued interest included in total [1]           1,185
Installment [Member] | Boat Lending [Member]            
Loan ratings/credit scores by loan class [Abstract]            
800 and above           32,231
750-799           123,689
700-749           38,223
650-699           10,189
600-649           2,083
550-599           661
500-549           342
Under 500           95
Unknown           0
Total           207,513
Accrued interest included in total           572
Installment [Member] | Recreational Vehicle Lending [Member]            
Loan ratings/credit scores by loan class [Abstract]            
800 and above           29,223
750-799           95,890
700-749           33,476
650-699           8,794
600-649           1,305
550-599           551
500-549           283
Under 500           52
Unknown           0
Total           169,574
Accrued interest included in total           457
Installment [Member] | Other [Member]            
Loan ratings/credit scores by loan class [Abstract]            
800 and above           9,154
750-799           37,512
700-749           25,262
650-699           21,138
600-649           3,730
550-599           1,299
500-549           767
Under 500           63
Unknown           510
Total           99,435
Accrued interest included in total           $ 156
[1] Beginning January 1, 2021, calculation is based on CECL methodology. Prior to January 1, 2021, calculation was based on the probable incurred loss methodology.