Other Real Estate Owned (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) branch property	Dec. 31, 2014 USD ($) property	Dec. 31, 2013 USD ($)	Oct. 16, 2015	Oct. 16, 2015 USD ($)	Oct. 16, 2015 branch	Oct. 16, 2015 property
Other Real Estate [Roll Forward]
Balance at beginning of year	$ 1,587,000	$ 2,195,000	$ 1,313,000
Other Real Estate, Additions	2,904,000	1,337,000	1,958,000
Disposals	(2,957,000)	(1,759,000)	(906,000)
Write-downs	230,000	(186,000)	(170,000)
Balance at end of year	$ 1,304,000	$ 1,587,000	2,195,000
Number of Properties | property	9	17
Real Estate Acquired Through Foreclosure	$ 1,304,000	$ 1,587,000
Number of Branches | branch	64
Gains (Losses) on Sales of Other Real Estate	$ (132,000)	$ (29,000)	$ 40,000
Residential Real Estate [Member]
Other Real Estate [Roll Forward]
Number of Properties | property	2	11
Real Estate Acquired Through Foreclosure	$ 241,000	$ 575,000
Commercial Real Estate [Member]
Other Real Estate [Roll Forward]
Number of Properties | property	7	6
Real Estate Acquired Through Foreclosure	$ 1,063,000	$ 1,012,000
SBM Financial, Inc. [Member]
Other Real Estate [Roll Forward]
Real Estate Acquired Through Foreclosure					$ 401,000
Number of Branches				4		64
SBM Financial, Inc. [Member] | Commercial Real Estate [Member]
Other Real Estate [Roll Forward]
Number of Properties | property							6
Real Estate Acquired Through Foreclosure	$ 729,000
Branches To Be Disposed Of [Member] | SBM Financial, Inc. [Member]
Other Real Estate [Roll Forward]
Number of Branches				2