Revenue From Contracts With Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 13,096	$ 12,458	$ 12,512
Service charges on deposit accounts | Over a period of time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,972	1,984	1,854
Service charges on deposit accounts | At a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	11,124	10,474	10,658
Debit and credit card
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	12,679	12,029	11,943
Debit and credit card | Over a period of time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	656	537	1,214
Debit and credit card | At a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	12,022	11,493	10,729
Wealth management
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	10,084	9,758	10,456
Wealth management | Over a period of time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7,113	7,067	7,708
Wealth management | At a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,971	2,691	2,748
Other fee revenue | At a point in time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 3,854	$ 3,679	$ 3,854