Revenue From Contracts With Customers (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	[1]	$ 13,316	$ 13,096	$ 12,458
Service charges on deposit accounts | Over a period of time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	[1]	1,859	1,972	1,984
Service charges on deposit accounts | At a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	[1]	11,457	11,124	10,474
Debit and credit card
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	[1]	13,405	12,679	12,029
Debit and credit card | Over a period of time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	[1]	723	656	537
Debit and credit card | At a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	[1]	12,682	12,022	11,493
Wealth management
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	[1]	8,623	10,084	9,758
Wealth management | Over a period of time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	[1]	6,939	7,113	7,067
Wealth management | At a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	[1]	1,684	2,971	2,691
Other fee revenue | At a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	[1]	$ 3,836	$ 3,854	$ 3,679

[1] Refer to Note 1. Summary of Significant Accounting Policies for the types of revenue streams that are included within each category.