Income Taxes (Reconciliation of Expected Income Tax Benefit Computed Using Federal Statutory Income Tax Rate) (Details) - USD ($) $ in Thousands		3 Months Ended										12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	[2]	Dec. 31, 2015	[3]	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Computed tax expense												$ 20,139	$ 10,801	$ 12,604
Tax exempt income												(1,312)	(1,092)	(704)
Income from life insurance												(908)	(588)	(503)
Effective income tax reconciliation, share based awards	[1]											(701)	0	0
State taxes, net of federal benefit												565	373	328
Low income housing credits												(376)	(359)	(286)
Effective interest rate reconciliation non-deductible acquisition costs												0	467	0
Other												65	305	1
Income tax expense		$ 4,730	$ 5,042	$ 4,258	$ 3,442		$ 716		$ 3,127	$ 3,341	$ 2,723	17,472	9,907	11,440
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		$ 15,632	$ 15,945	$ 13,874	$ 12,088		$ 2,408		$ 9,583	$ 10,534	$ 8,334	$ 57,539	$ 30,859	$ 36,010
Income tax rate used for calculations												30.40%	32.10%	31.80%

[1] (1) Prior to the adoption of ASU 2016-09, the Company accounted for its windfall tax benefits or shortfalls generated upon exercise of a non-qualified stock option or a disqualifying incentive stock option, or upon vesting of its restricted shares through shareholders' equity (or as income tax expense to the extent the Company did not have a windfall tax benefit surplus). Upon adoption, the Company has accounted for its windfall tax benefits and shortfalls generated within income tax expense on the consolidated statements of income as a discrete period item in the quarter generated.

[2] (1)In the second quarter of 2016, the Company adopted ASU 2016-09 effective as of January 1, 2016. As such, first quarter 2016 financial results have been restated from previously reported within Form 10-Q.

[3] On October 16, 2015, the Company completed its acquisition of SBM. Fourth quarter 2015 results of operations include revenues and expenses incurred as a combined organization from the acquisition date through December 31, 2015. The decrease in basic and diluted EPS in the fourth quarter of 2015 was due to acquisition costs and the issuance of 4.1 million shares of Company common stock (as adjusted for the three-for-two common stock split effective September 30, 2016) in connection with the acquisition. Refer to Note 2 for additional details of the acquisition