Business Combinations, Net Assets Acquired and Estimated Fair Value Adjustment (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Nov. 18, 2016 USD ($)	Dec. 31, 2016 USD ($) Premises $ / shares shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Fair Value Adjustments [Abstract]
DTA Carryforward		$ 1,135	$ 0
Bargain Purchase Gain		$ 1,832	$ 0	$ 0
Tax rate on purchase accounting adjustments		35.10%	38.20%	37.30%
Delta National Bancorp [Member]
Fair Value Adjustments [Abstract]
Loans	$ (1,063)
Reversal of Allowance for Loan Loss	588
Core Deposit Intangible Asset	959
Other Assets & Liabilities, net	1,610
Total Purchase Accounting Adjustments	2,094
Deferred Tax Asset (tax effect of purchase accounting adjustments at 42%)	(880)
DTA Carryforward	1,773
Less Merger Consideration	(9,179)
Bargain Purchase Gain	$ 1,832
Tax rate on purchase accounting adjustments	42.00%
Core deposit intangible assets, amortization period		10 years
Number of shares of common stock issued (in shares) | shares		11,932
Per share price of shares issued (in dollars per share) | $ / shares		$ 580
Delta National Bancorp [Member] | Branch Premises [Member]
Fair Value Adjustments [Abstract]
Number of properties | Premises		2
Ownership interest in properties		100.00%
Book Value [Member] | Delta National Bancorp [Member]
Business Acquisition [Line Items]
Net Assets Acquired	$ 8,024
Fair Value [Member] | Delta National Bancorp [Member]
Business Acquisition [Line Items]
Net Assets Acquired	$ 11,011