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, 2015	[1]	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Computed tax expense										$ 10,801	$ 12,604	$ 12,220
Tax exempt income										(1,092)	(704)	(510)
Income from life insurance										(588)	(503)	(459)
Effective interest rate reconciliation non-deductible acquisition costs										467	0	0
State taxes, net of federal benefit										373	328	260
Low income housing credits										(359)	(286)	(299)
Goodwill impairment										0	0	991
Other										305	1	(71)
Income tax expense	$ 716		$ 3,127	$ 3,341	$ 2,723	$ 2,523	$ 3,154	$ 3,001	$ 2,762	$ 9,907	$ 11,440	$ 12,132
Income tax rate used for calculations										32.10%	31.80%	34.70%

[1] 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 2.7 million shares of Company common stock in connection with the acquisition. Refer to Note 2 and 3 for additional details of the acquisition