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Loans - Amortized Cost of Collateral-dependent Loans by Class (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss $ 3,741,486   $ 3,465,352      
Allowance for Credit Losses 55,495 $ 53,964 52,435 $ 51,142 $ 47,883 $ 47,252
Accrued interest excluded from total 11,962   10,009      
Real Estate            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 6,820   10,553      
Accrued interest excluded from total 14   40      
Other            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 3,525   1,764      
Accrued interest excluded from total 13   6      
Allowance for Credit Losses            
Financing Receivable, Past Due [Line Items]            
Allowance for Credit Losses 2,582   2,074      
Commercial            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 1,626,122   1,466,853      
Allowance for Credit Losses 17,550 16,284 13,817 12,445 11,059 11,519
Accrued interest excluded from total 5,461   4,409      
Commercial | Commercial and industrial            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 773,414   732,463      
Accrued interest excluded from total 2,531   2,046      
Commercial | Commercial and industrial | Real Estate            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 1,728   748      
Commercial | Commercial and industrial | Other            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 2,994   1,309      
Commercial | Commercial and industrial | Allowance for Credit Losses            
Financing Receivable, Past Due [Line Items]            
Allowance for Credit Losses 1,588   197      
Commercial | Commercial real estate            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 852,708   734,390      
Accrued interest excluded from total 2,930   2,363      
Commercial | Commercial real estate | Real Estate            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 2,068   7,329      
Commercial | Commercial real estate | Other            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 0   0      
Commercial | Commercial real estate | Allowance for Credit Losses            
Financing Receivable, Past Due [Line Items]            
Allowance for Credit Losses 0   1,243      
Mortgage            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 1,475,908   1,368,409      
Allowance for Credit Losses 20,022 20,080 21,633 21,610 20,313 19,221
Accrued interest excluded from total 4,876   4,116      
Mortgage | 1-4 family owner occupied - jumbo            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 841,146   752,563      
Accrued interest excluded from total 2,274   1,892      
Mortgage | 1-4 family owner occupied - jumbo | Real Estate            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 0   0      
Mortgage | 1-4 family owner occupied - jumbo | Other            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 0   0      
Mortgage | 1-4 family owner occupied - jumbo | Allowance for Credit Losses            
Financing Receivable, Past Due [Line Items]            
Allowance for Credit Losses 0   0      
Mortgage | 1-4 family owner occupied - non-jumbo            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 303,756   285,632      
Accrued interest excluded from total 1,058   953      
Mortgage | 1-4 family owner occupied - non-jumbo | Real Estate            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 2,228   1,721      
Mortgage | 1-4 family owner occupied - non-jumbo | Other            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 0   0      
Mortgage | 1-4 family owner occupied - non-jumbo | Allowance for Credit Losses            
Financing Receivable, Past Due [Line Items]            
Allowance for Credit Losses 271   229      
Mortgage | 1-4 family non-owner occupied            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 180,678   183,100      
Accrued interest excluded from total 626   558      
Mortgage | 1-4 family non-owner occupied | Real Estate            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 159   233      
Mortgage | 1-4 family non-owner occupied | Other            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 0   0      
Mortgage | 1-4 family non-owner occupied | Allowance for Credit Losses            
Financing Receivable, Past Due [Line Items]            
Allowance for Credit Losses 159   29      
Mortgage | 1-4 family - 2nd lien            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 113,486   105,277      
Accrued interest excluded from total 773   588      
Mortgage | 1-4 family - 2nd lien | Real Estate            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 366   368      
Mortgage | 1-4 family - 2nd lien | Other            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 0   0      
Mortgage | 1-4 family - 2nd lien | Allowance for Credit Losses            
Financing Receivable, Past Due [Line Items]            
Allowance for Credit Losses 165   203      
Mortgage | Resort lending            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 36,842   41,837      
Accrued interest excluded from total 145   125      
Mortgage | Resort lending | Real Estate            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 271   148      
Mortgage | Resort lending | Other            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 0   0      
Mortgage | Resort lending | Allowance for Credit Losses            
Financing Receivable, Past Due [Line Items]            
Allowance for Credit Losses 211   14      
Installment            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 639,456   630,090      
Allowance for Credit Losses 4,183 $ 4,315 4,290 $ 4,327 $ 4,220 $ 3,749
Accrued interest excluded from total 1,625   1,484      
Installment | Boat lending            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 274,184   252,965      
Accrued interest excluded from total 700   601      
Installment | Boat lending | Real Estate            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 0   0      
Installment | Boat lending | Other            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 207   297      
Installment | Boat lending | Allowance for Credit Losses            
Financing Receivable, Past Due [Line Items]            
Allowance for Credit Losses 73   101      
Installment | Recreational vehicle lending            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 259,545   270,673      
Accrued interest excluded from total 653   648      
Installment | Recreational vehicle lending | Real Estate            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 0   0      
Installment | Recreational vehicle lending | Other            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 235   30      
Installment | Recreational vehicle lending | Allowance for Credit Losses            
Financing Receivable, Past Due [Line Items]            
Allowance for Credit Losses 83   11      
Installment | Other            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 105,727   106,452      
Accrued interest excluded from total 272   235      
Installment | Other | Real Estate            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 0   6      
Installment | Other | Other            
Financing Receivable, Past Due [Line Items]            
Financing receivable, before allowance for credit loss 89   128      
Installment | Other | Allowance for Credit Losses            
Financing Receivable, Past Due [Line Items]            
Allowance for Credit Losses $ 32   $ 47