Summary of Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) Segment trust borrower shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares	Dec. 01, 2014
Accounting Policy [Line Items]
Number of Trust | trust	2
Number of operating segments | Segment	2
Maturity period of securities at acquisition	90 days
Threshold for nonperforming loans individually evaluated for impairment	$ 50,000
Loan loss history used	5 years
Average holding of purchased receivables	1 year
Marketing expense	$ 2,728,000	$ 2,059,000	$ 1,853,000
Anti-dilutive shares | shares	54,903	0	0
Commercial and construction loans	$ 449,000,000	$ 432,600,000
Large borrowing relationships | borrower	27
Unfunded commitments to large borrowers	$ 128,500,000
Lender Concentration Risk
Accounting Policy [Line Items]
Concentration risk, percent	41.00%
Buildings
Accounting Policy [Line Items]
Premises and equipment, useful life	39 years
Minimum | Furniture And Equipment
Accounting Policy [Line Items]
Premises and equipment, useful life	3 years
Minimum | Tenant Improvements
Accounting Policy [Line Items]
Premises and equipment, useful life	2 years
Maximum | Furniture And Equipment
Accounting Policy [Line Items]
Premises and equipment, useful life	7 years
Maximum | Tenant Improvements
Accounting Policy [Line Items]
Premises and equipment, useful life	15 years
RML
Accounting Policy [Line Items]
Voting interests acquired				76.50%