Segment Information (Segment Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Net Interest Income	$ 18,859	$ 18,791	$ 56,114	$ 55,308
Net Gains on Sales of Loans	831	613	2,364	1,475
Net Gains on Securities	0	567	725	1,039
Trust and Investment Product Fees	1,051	901	2,974	2,728
Insurance Revenues	1,752	1,739	5,812	5,777
Noncash Items:
Provision for Loan Losses	(500)	0	0	550
Depreciation and Amortization	1,047	1,189	3,254	3,611
Income Tax Expense (Benefit)	2,429	3,438	8,668	8,967
Segment Profit (Loss)	7,721	7,708	22,352	20,700
Segment Assets	2,313,210		2,313,210		$ 2,237,099
Core Banking
Segment Reporting Information [Line Items]
Net Interest Income	18,961	18,908	56,402	55,655
Net Gains on Sales of Loans	831	613	2,364	1,475
Net Gains on Securities	0	567	698	1,039
Trust and Investment Product Fees	1	2	3	4
Insurance Revenues	8	15	19	20
Noncash Items:
Provision for Loan Losses	(500)	0	0	550
Depreciation and Amortization	980	1,120	3,045	3,395
Income Tax Expense (Benefit)	2,571	3,496	8,709	8,940
Segment Profit (Loss)	7,702	7,540	21,650	19,908
Segment Assets	2,307,765		2,307,765		2,242,456
Trust and Investment Advisory Services
Segment Reporting Information [Line Items]
Net Interest Income	0	4	8	12
Net Gains on Sales of Loans	0	0	0	0
Net Gains on Securities	0	0	0	0
Trust and Investment Product Fees	1,053	899	2,974	2,724
Insurance Revenues	15	22	33	33
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	2	5	15	18
Income Tax Expense (Benefit)	(1)	(15)	(13)	(122)
Segment Profit (Loss)	(14)	(30)	(47)	(202)
Segment Assets	1,493		1,493		11,401
Insurance
Segment Reporting Information [Line Items]
Net Interest Income	2	1	4	3
Net Gains on Sales of Loans	0	0	0	0
Net Gains on Securities	0	0	0	0
Trust and Investment Product Fees	0	0	0	0
Insurance Revenues	1,729	1,702	5,760	5,724
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	27	26	81	85
Income Tax Expense (Benefit)	84	147	576	747
Segment Profit (Loss)	140	216	874	1,078
Segment Assets	7,410		7,410		6,429
Other
Segment Reporting Information [Line Items]
Net Interest Income	(104)	(122)	(300)	(362)
Net Gains on Sales of Loans	0	0	0	0
Net Gains on Securities	0	0	27	0
Trust and Investment Product Fees	(3)	0	(3)	0
Insurance Revenues	0	0	0	0
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	38	38	113	113
Income Tax Expense (Benefit)	(225)	(190)	(604)	(598)
Segment Profit (Loss)	(107)	$ (18)	(125)	$ (84)
Segment Assets	$ (3,458)		$ (3,458)		$ (23,187)