Segment Information (Segment Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net Interest Income	$ 33,591	$ 25,610
Net Gains on Sales of Loans	981	650
Net Gains on Securities	155	270
Trust and Investment Product Fees	1,567	1,773
Insurance Revenues	3,205	2,930
Noncash Items:
Provision for Loan Losses	675	350
Depreciation and Amortization	2,010	1,199
Income Tax Expense (Benefit)	2,748	2,484
Segment Profit (Loss)	15,067	11,813
Segment Assets	3,895,524		$ 3,929,090
Operating Segments | Core Banking
Segment Reporting Information [Line Items]
Net Interest Income	34,135	25,790
Net Gains on Sales of Loans	981	650
Net Gains on Securities	155	270
Trust and Investment Product Fees	1	2
Insurance Revenues	3	1
Noncash Items:
Provision for Loan Losses	675	350
Depreciation and Amortization	1,927	1,115
Income Tax Expense (Benefit)	2,655	2,244
Segment Profit (Loss)	14,499	10,762
Segment Assets	3,888,904		3,926,242
Operating Segments | Trust and Investment Advisory Services
Segment Reporting Information [Line Items]
Net Interest Income	2	3
Net Gains on Sales of Loans	0	0
Net Gains on Securities	0	0
Trust and Investment Product Fees	1,566	1,771
Insurance Revenues	21	2
Noncash Items:
Provision for Loan Losses	0	0
Depreciation and Amortization	1	1
Income Tax Expense (Benefit)	76	136
Segment Profit (Loss)	215	385
Segment Assets	2,963		2,658
Operating Segments | Insurance
Segment Reporting Information [Line Items]
Net Interest Income	5	2
Net Gains on Sales of Loans	0	0
Net Gains on Securities	0	0
Trust and Investment Product Fees	0	0
Insurance Revenues	3,181	2,927
Noncash Items:
Provision for Loan Losses	0	0
Depreciation and Amortization	18	19
Income Tax Expense (Benefit)	357	321
Segment Profit (Loss)	1,090	939
Segment Assets	8,771		11,368
Other
Segment Reporting Information [Line Items]
Net Interest Income	(551)	(185)
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	64	64
Income Tax Expense (Benefit)	(340)	(217)
Segment Profit (Loss)	(737)	$ (273)
Segment Assets	$ (5,114)		$ (11,178)