Segment Information (Segment Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net Interest Income	$ 20,784	$ 18,549
Net Gains on Sales of Loans	720	749
Net Gains on Securities	0	463
Trust and Investment Product Fees	1,021	984
Insurance Revenues	2,727	2,545
Noncash Items:
Provision for Loan Losses	850	250
Depreciation and Amortization	1,048	1,121
Income Tax Expense (Benefit)	1,765	3,302
Segment Profit (Loss)	5,146	7,306
Segment Assets	2,866,727		$ 2,373,701
Core Banking
Segment Reporting Information [Line Items]
Net Interest Income	20,898	18,641
Net Gains on Sales of Loans	720	749
Net Gains on Securities	0	463
Trust and Investment Product Fees	1	1
Insurance Revenues	4	10
Noncash Items:
Provision for Loan Losses	850	250
Depreciation and Amortization	975	1,052
Income Tax Expense (Benefit)	1,681	3,063
Segment Profit (Loss)	5,081	6,680
Segment Assets	2,856,970		2,367,296
Trust and Investment Advisory Services
Segment Reporting Information [Line Items]
Net Interest Income	(1)	4
Net Gains on Sales of Loans	0	0
Net Gains on Securities	0	0
Trust and Investment Product Fees	1,020	983
Insurance Revenues	8	17
Noncash Items:
Provision for Loan Losses	0	0
Depreciation and Amortization	1	5
Income Tax Expense (Benefit)	14	(1)
Segment Profit (Loss)	7	(9)
Segment Assets	1,554		1,338
Insurance
Segment Reporting Information [Line Items]
Net Interest Income	2	1
Net Gains on Sales of Loans	0	0
Net Gains on Securities	0	0
Trust and Investment Product Fees	0	0
Insurance Revenues	2,715	2,518
Noncash Items:
Provision for Loan Losses	0	0
Depreciation and Amortization	26	27
Income Tax Expense (Benefit)	510	420
Segment Profit (Loss)	790	629
Segment Assets	8,088		7,022
Other
Segment Reporting Information [Line Items]
Net Interest Income	(115)	(97)
Net Gains on Sales of Loans	0	0
Net Gains on Securities	0	0
Trust and Investment Product Fees	0	0
Insurance Revenues	0	0
Noncash Items:
Provision for Loan Losses	0	0
Depreciation and Amortization	46	37
Income Tax Expense (Benefit)	(440)	(180)
Segment Profit (Loss)	(732)	$ 6
Segment Assets	$ 115		$ (1,955)