Loans - Amortized Cost of Collateral-dependent Loans by Class (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	$ 3,942,287		$ 3,790,901
Allowance for Credit Losses	57,444	$ 56,241	54,658	$ 55,495	$ 53,964	$ 52,435
Accrued interest excluded from total	13,336		12,500
Real Estate
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	6,212		3,950
Accrued interest excluded from total	6		1
Other
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	5,746		934
Accrued interest excluded from total	37		0
Allowance for Credit Losses
Financing Receivable, Past Due [Line Items]
Allowance for Credit Losses	2,453		1,292
Commercial
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	1,825,247		1,679,731
Allowance for Credit Losses	20,162	18,979	16,724	17,550	16,284	13,817
Accrued interest excluded from total	6,298		5,743
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	954,752		810,145
Accrued interest excluded from total	3,441		2,710
Commercial | Commercial and industrial | Real Estate
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	693		565
Commercial | Commercial and industrial | Other
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	5,321		232
Commercial | Commercial and industrial | Allowance for Credit Losses
Financing Receivable, Past Due [Line Items]
Allowance for Credit Losses	1,758		224
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	870,495		869,586
Accrued interest excluded from total	2,857		3,033
Commercial | Commercial real estate | Real Estate
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	827		0
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	6		0
Mortgage
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	1,511,400		1,485,872
Allowance for Credit Losses	19,832	20,731	21,386	20,022	20,080	21,633
Accrued interest excluded from total	5,374		5,097
Mortgage | 1-4 family owner occupied - jumbo
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	871,867		859,236
Accrued interest excluded from total	2,436		2,375
Mortgage | 1-4 family owner occupied - jumbo | Real Estate
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	762		544
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	305,494		301,172
Accrued interest excluded from total	1,209		1,111
Mortgage | 1-4 family owner occupied - non-jumbo | Real Estate
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	3,443		2,243
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	365		504
Mortgage | 1-4 family non-owner occupied
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	172,694		173,816
Accrued interest excluded from total	658		654
Mortgage | 1-4 family non-owner occupied | Real Estate
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	87		211
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	31		178
Mortgage | 1-4 family - 2nd lien
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	129,203		116,032
Accrued interest excluded from total	903		804
Mortgage | 1-4 family - 2nd lien | Real Estate
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	257		244
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	91		87
Mortgage | Resort lending
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	32,142		35,616
Accrued interest excluded from total	168		153
Mortgage | Resort lending | Real Estate
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	143		143
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	51		51
Installment
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	605,640		625,298
Allowance for Credit Losses	4,544	$ 3,901	4,126	$ 4,183	$ 4,315	$ 4,290
Accrued interest excluded from total	1,664		1,660
Installment | Boat lending
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	271,646		268,648
Accrued interest excluded from total	764		714
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	89		297
Installment | Boat lending | Allowance for Credit Losses
Financing Receivable, Past Due [Line Items]
Allowance for Credit Losses	32		105
Installment | Recreational vehicle lending
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	233,067		251,852
Accrued interest excluded from total	611		655
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	271		303
Installment | Recreational vehicle lending | Allowance for Credit Losses
Financing Receivable, Past Due [Line Items]
Allowance for Credit Losses	96		107
Installment | Other
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	100,927		104,798
Accrued interest excluded from total	289		291
Installment | Other | Real Estate
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	0		0
Installment | Other | Other
Financing Receivable, Past Due [Line Items]
Financing receivable, before allowance for credit loss	65		102
Installment | Other | Allowance for Credit Losses
Financing Receivable, Past Due [Line Items]
Allowance for Credit Losses	$ 23		$ 36