Revenue From Contracts with Customers Revenue From Contracts with Customers (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018		Sep. 30, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Interest Income (Expense), Net	[1]	$ 40,423	$ 36,887		$ 116,685		$ 106,470
Insurance commission and fee income		3,643	3,492		12,243		11,530
Bank owned life insurance income	[1]	865	742		2,744		3,147
Net gain on sales of investment securities		0	7	[1]	10	[1]	43	[1]
Net gain on mortgage banking activities	[1]	754	908		2,412		3,558
Other income	[2]	116	87		102		712
Total noninterest income		14,861	14,109		45,757		45,088
Trust fee income
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income		1,960	1,924		6,000		5,847
Service charges on deposit accounts
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income		1,454	1,371		4,116		3,927
Investment advisory commission and fee income
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income		3,785	3,455		11,246		9,969
Other service fee income
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income	[2]	2,284	2,123		6,884		6,355
Banking [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Interest Income (Expense), Net	[1]	41,667	38,130		120,423		110,223
Insurance commission and fee income		0	0		0		0
Bank owned life insurance income	[1]	708	675		2,567		2,886
Net gain on sales of investment securities	[1]		6		10		39
Net gain on mortgage banking activities	[1]	754	908		2,412		3,558
Other income	[2]	122	86		76		710
Total noninterest income		5,070	4,993		15,320		16,945
Banking [Member] | Trust fee income
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income		0	0		0		0
Banking [Member] | Service charges on deposit accounts
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income		1,454	1,371		4,116		3,927
Banking [Member] | Investment advisory commission and fee income
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income		0	0		0		0
Banking [Member] | Other service fee income
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income	[2]	2,032	1,947		6,139		5,825
Wealth Management [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Interest Income (Expense), Net	[1]	9	4		22		6
Insurance commission and fee income		0	0		0		0
Bank owned life insurance income	[1]	0	0		0		0
Net gain on sales of investment securities	[1]		0		0		0
Net gain on mortgage banking activities	[1]	0	0		0		0
Other income	[2]	0	0		0		0
Total noninterest income		5,795	5,428		17,397		15,965
Wealth Management [Member] | Trust fee income
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income		1,960	1,924		6,000		5,847
Wealth Management [Member] | Service charges on deposit accounts
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income		0	0		0		0
Wealth Management [Member] | Investment advisory commission and fee income
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income		3,785	3,455		11,246		9,969
Wealth Management [Member] | Other service fee income
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income	[2]	50	49		151		149
Insurance [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Interest Income (Expense), Net	[1]	0	0		0		0
Insurance commission and fee income		3,643	3,492		12,243		11,530
Bank owned life insurance income	[1]	0	0		0		0
Net gain on sales of investment securities	[1]		0		0		0
Net gain on mortgage banking activities	[1]	0	0		0		0
Other income	[2]	0	1		(2)		2
Total noninterest income		3,845	3,620		12,835		11,913
Insurance [Member] | Trust fee income
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income		0	0		0		0
Insurance [Member] | Service charges on deposit accounts
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income		0	0		0		0
Insurance [Member] | Investment advisory commission and fee income
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income		0	0		0		0
Insurance [Member] | Other service fee income
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income	[2]	202	127		594		381
Other Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Interest Income (Expense), Net	[1]	(1,253)	(1,247)		(3,760)		(3,759)
Insurance commission and fee income		0	0		0		0
Bank owned life insurance income	[1]	157	67		177		261
Net gain on sales of investment securities	[1]		1		0		4
Net gain on mortgage banking activities	[1]	0	0		0		0
Other income	[2]	(6)	0		28		0
Total noninterest income		151	68		205		265
Other Segments [Member] | Trust fee income
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income		0	0		0		0
Other Segments [Member] | Service charges on deposit accounts
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income		0	0		0		0
Other Segments [Member] | Investment advisory commission and fee income
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income		0	0		0		0
Other Segments [Member] | Other service fee income
Segment Reporting, Revenue Reconciling Item [Line Items]
Noninterest income	[2]	$ 0	$ 0		$ 0		$ 0

[1] (1)Net interest income as well as many other revenues for financial assets and liabilities including loans, leases, securities, and derivatives are excluded from the scope of the standard. Noninterest income streams that are out-of-scope of the standard include bank owned life insurance income, sales of investment securities and mortgage banking activities.

[2] (2)Other service fee income and other income include certain items that are in scope and certain items that are out of scope of the standard and are described further in the following paragraphs.