Acquisitions (Pro Forma Condensed Financial Information) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
		Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Business Acquisition [Line Items]
Net income			$ 17,704	$ 17,407		$ 21,030
Parent Company [Member]
Business Acquisition [Line Items]
Net income			$ 17,704	17,407		21,030
Bancshares [Member]
Business Acquisition [Line Items]
Interest Income				84,399	[1]	84,710
Interest expense				8,049	[1]	8,236
Net interest income				76,350	[1]	76,474
Provision for loan losses				(3,080)	[1]	(6,398)
Non-interest income				16,292	[1]	21,439
Non-interest expense	[2]			68,860	[1]	67,779
Income before taxes				26,862	[1]	36,532
Income taxes				9,601	[1]	13,646
Net income				17,261	[1]	22,886
Earnings allocated to participating securities				(258)	[1]	(253)
Numerator for earnings per common share				$ 17,003	[1]	$ 22,633
Earnings per share: Basic				$ 0.90	[1]	$ 1.10
Earnings per share: Diluted				$ 0.89	[1]	$ 1.09
Basic weighted average shares outstanding				18,975,450	[1]	20,631,471
Diluted weighted average shares outstanding				19,129,533	[1]	20,774,348
Revenues		$ 2,900
Costs and Expenses		1,200
Net income		1,100
Other Nonrecurring Expense		1,900
Nonrecurring Personnel Related Expense		500
Nonrecurring Data Processing Expenses		400
Nonrecurring Legal, Accounting And Investment Banker Expenses		500
Nonrecurring Marketing And Other Expenses		$ 500
Pro Forma Non-Recurring Expense				$ 2,500
Pro Forma Non-Recurring Expense, Employee Related Expense				700
Pro Forma Non-Recurring Expense, Legal Expenses				400
Pro Forma Non-Recurring Expense, Discount Loan Provision				$ 1,400

[1] Subsequent to the Bancshares Merger date, activity related to Bancshares contributed pre-tax revenues of $2.9 million and incurred pre-tax expenses of $1.2 million, resulting in $1.1 million total contribution to our net income. We incurred pre-tax non-recurring expenses totaling $1.9 million, including: $0.5 million in personnel related expenses, $0.4 million in data processing expenses, $0.5 million in legal, accounting and investment banker expenses, and $0.5 million in marketing and other expenses.

[2] The 2015 pro forma non-interest expense is adjusted to exclude $2.5 million of pre-tax non-recurring expenses incurred by Bancshares prior to the Bancshares Merger date attributed to the following: $0.7 million in employee related expenses, $0.4 million in legal expenses, and $1.4 million to discount a loan pursuant to a provision of the Bancshares Merger Agreement.