Fair Value (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Repossessed Assets	$ 3,600,000	$ 4,200,000
Discount percentage applied to real estate appraised values	15.00%
Discount percentage applied to lot development appraised values	6.00%
Mortgage loan servicing rights	$ 12,210,000	10,070,000	$ 10,178,000	$ 9,688,000
Servicing Asset at Fair Value, Amount	12,200,000	5,800,000
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance	3,189,000	825,000	232,000	$ 630,000
MSRs recorded at cost	31,000	4,300,000
Valuation Allowance for Impairment of Recognized Servicing Assets, Additions (Deductions) for Expenses (Recoveries)	2,364,000	593,000	(398,000)
Other real estate owned	$ 1,431,000	$ 4,029,000
Percent of OREO held at fair value	51.00%	75.00%
Estimated fair value of other real estate owned (OREO)	$ 735,000	$ 3,000,000.0
OREO devaluations	100,000	(200,000)	(500,000)
expense related to other repossessed assets	435,000		269,000
Alternative Investment	21,522,000	20,411,000
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	6,200,000	8,500,000
Alternative Investment, income recognized	2,400,000	4,800,000	$ 1,400,000
Nonrecurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Repossessed Assets	3,164,000	3,599,000
Servicing Asset at Fair Value, Amount	12,179,000	5,797,000
Fair Value, Inputs, Level 3 [Member] | Nonrecurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Repossessed Assets	3,164,000	3,599,000
Fair Value Measured at Net Asset Value Per Share [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investment	$ 15,400,000	$ 11,900,000