Segment Information (Segment Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net Interest Income	$ 24,671	$ 18,706	$ 45,455	$ 37,255
Net Gains on Sales of Loans	883	784	1,603	1,533
Net Gains on Securities	968	262	968	725
Trust and Investment Product Fees	1,223	939	2,244	1,923
Insurance Revenues	1,605	1,515	4,332	4,060
Noncash Items:
Provision for Loan Losses	350	250	1,200	500
Depreciation and Amortization	1,179	1,086	2,227	2,207
Income Tax Expense (Benefit)	4,249	2,937	6,014	6,239
Segment Profit (Loss)	9,788	7,325	14,934	14,631
Segment Assets	2,915,811	2,373,701	2,915,811	2,373,701	$ 2,373,701
Core Banking
Segment Reporting Information [Line Items]
Net Interest Income	24,873	18,800	45,771	37,441
Net Gains on Sales of Loans	883	784	1,603	1,533
Net Gains on Securities	968	235	968	698
Trust and Investment Product Fees	2	1	3	2
Insurance Revenues	4	1	8	11
Noncash Items:
Provision for Loan Losses	350	250	1,200	500
Depreciation and Amortization	1,089	1,016	2,064	2,068
Income Tax Expense (Benefit)	4,419	3,075	6,100	6,138
Segment Profit (Loss)	9,800	7,268	14,881	13,948
Segment Assets	2,909,441	2,367,296	2,909,441	2,367,296	2,367,296
Trust and Investment Advisory Services
Segment Reporting Information [Line Items]
Net Interest Income	1	4	0	8
Net Gains on Sales of Loans	0	0	0	0
Net Gains on Securities	0	0	0	0
Trust and Investment Product Fees	1,221	938	2,241	1,921
Insurance Revenues	5	1	13	18
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	1	5	2	10
Income Tax Expense (Benefit)	50	(11)	64	(12)
Segment Profit (Loss)	76	(24)	83	(33)
Segment Assets	1,808	1,338	1,808	1,338	1,338
Insurance
Segment Reporting Information [Line Items]
Net Interest Income	1	1	3	2
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	1,596	1,513	4,311	4,031
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	25	27	51	54
Income Tax Expense (Benefit)	58	72	568	492
Segment Profit (Loss)	87	105	877	734
Segment Assets	7,864	7,022	7,864	7,022	7,022
Other
Segment Reporting Information [Line Items]
Net Interest Income	(204)	(99)	(319)	(196)
Net Gains on Sales of Loans	0	0	0	0
Net Gains on Securities	0	27	0	27
Trust and Investment Product Fees	0	0	0	0
Insurance Revenues	0	0	0	0
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	64	38	110	75
Income Tax Expense (Benefit)	(278)	(199)	(718)	(379)
Segment Profit (Loss)	(175)	(24)	(907)	(18)
Segment Assets	$ (3,302)	$ (1,955)	$ (3,302)	$ (1,955)	$ (1,955)