Business Combinations Narrative (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) branch	Aug. 14, 2015 USD ($)
Business Acquisition [Line Items]
number of bank branches acquired | branch	12
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits		$ 453,647,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans		152,397,000
Business Acquisition Deposit Premium Rate On Core Deposits	0.036
Business Acquisition Deposit Premium on Core Deposits	$ 15,900,000
Business Combinations Fixed Deposit Premium For Municipal Deposits	500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	4,500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	2,700,000	279,468,000
Business Combination Cash Settlement	276,800,000
Acquired Book Value [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	453,000,000	452,810,000
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans	$ 156,000,000	155,774,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		$ 279,468,000