Mortgage Banking (Additional Information) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Servicing Assets at Fair Value [Line Items]
Gain (Loss) on Sale of Mortgage Loans		$ 6,365,000	$ 5,451,000	$ 6,256,000
Receivables Held-for-sale, Amount		11,900,000	4,300,000
Unrealized Gain (Loss) on Derivatives		(61,000)	89,000
Unrealized gain (loss) on loans held for sale		(150,000)	52,000	326,000
Fees and Commissions, Mortgage Banking and Servicing		7,837,000	5,914,000	7,363,000
Servicing Asset at Amortized Cost		$ 877,000	$ 831,000	1,025,000	$ 1,210,000
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed		14.40%	11.50%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate		11.20%	11.10%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed		$ 65,000
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Prepayment Speed		126,000
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Discount Rate		47,000
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Discount Rate		90,000
Capitalized servicing right fees upon sale(1)	[1]	263,000	$ 0	22,000
Fixed Rate Residential Mortgage [Member]
Servicing Assets at Fair Value [Line Items]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Cost of Mortgage Sold		271,800,000	205,900,000	218,600,000
Forward Contracts [Member]
Servicing Assets at Fair Value [Line Items]
Unrealized Gain (Loss) on Derivatives		282,000	(127,000)	(136,000)
Servicing Assets
Servicing Assets at Fair Value [Line Items]
Mortgage loans serviced during period, value		227,800,000	235,400,000
Fees and Commissions, Mortgage Banking and Servicing		$ 898,000,000	$ 900,000	$ 1,000,000

[1] (1)Associated income was reported within mortgage banking income, net on the consolidated statements of income.