Segment Information (Segment Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net Interest Income	$ 24,560	$ 18,859	$ 70,015	$ 56,114
Net Gains on Sales of Loans	1,004	831	2,607	2,364
Net Gains on Securities	458	0	1,426	725
Trust and Investment Product Fees	1,191	1,051	3,435	2,974
Insurance Revenues	1,661	1,752	5,993	5,812
Noncash Items:
Provision for Loan Losses	0	(500)	1,200	0
Depreciation and Amortization	1,139	1,047	3,366	3,254
Income Tax Expense (Benefit)	4,106	2,429	10,120	8,668
Segment Profit (Loss)	10,185	7,721	25,119	22,352
Segment Assets	2,979,540	2,373,701	2,979,540	2,373,701	$ 2,373,701
Core Banking
Segment Reporting Information [Line Items]
Net Interest Income	24,721	18,961	70,492	56,402
Net Gains on Sales of Loans	1,004	831	2,607	2,364
Net Gains on Securities	458	0	1,426	698
Trust and Investment Product Fees	(6)	1	(3)	3
Insurance Revenues	6	8	14	19
Noncash Items:
Provision for Loan Losses	0	(500)	1,200	0
Depreciation and Amortization	1,065	980	3,129	3,045
Income Tax Expense (Benefit)	4,249	2,571	10,349	8,709
Segment Profit (Loss)	10,168	7,702	25,049	21,650
Segment Assets	2,972,622	2,367,296	2,972,622	2,367,296	2,367,296
Trust and Investment Advisory Services
Segment Reporting Information [Line Items]
Net Interest Income	0	0	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	1,205	1,053	3,446	2,974
Insurance Revenues	15	15	28	33
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	0	2	2	15
Income Tax Expense (Benefit)	51	(1)	115	(13)
Segment Profit (Loss)	69	(14)	152	(47)
Segment Assets	1,792	1,338	1,792	1,338	1,338
Insurance
Segment Reporting Information [Line Items]
Net Interest Income	2	2	5	4
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	1,640	1,729	5,951	5,760
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	10	27	61	81
Income Tax Expense (Benefit)	80	84	648	576
Segment Profit (Loss)	122	140	999	874
Segment Assets	7,842	7,022	7,842	7,022	7,022
Other
Segment Reporting Information [Line Items]
Net Interest Income	(163)	(104)	(482)	(300)
Net Gains on Sales of Loans	0	0	0	0
Net Gains on Securities	0	0	0	27
Trust and Investment Product Fees	(8)	(3)	(8)	(3)
Insurance Revenues	0	0	0	0
Noncash Items:
Provision for Loan Losses	0	0	0	0
Depreciation and Amortization	64	38	174	113
Income Tax Expense (Benefit)	(274)	(225)	(992)	(604)
Segment Profit (Loss)	(174)	(107)	(1,081)	(125)
Segment Assets	$ (2,716)	$ (1,955)	$ (2,716)	$ (1,955)	$ (1,955)