Investment Securities (Narrative) (Details) shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($) security financial_institution shares	Dec. 31, 2009 USD ($)	Dec. 31, 2015 USD ($) shares
Schedule of Available-for-sale Securities [Line Items]
Restricted stock	$ 6,000		$ 3,300
Federal Home Loan Bank, stock	$ 5,900		$ 3,200
Bankers Bank Stock | shares	65		65
Other than temporary impairment		$ 865
Other than temporary impairment loss, portion recognized in earnings		364
Other than temporary impairment loss, portion in other comprehensive loss		$ 501
Trust preferred debt securities – single issuer [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of corporate trust preferred securities issued | security	4
Number of issuers of corporate trust preferred securities | financial_institution	2
Trust preferred debt securities-pooled [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of issuers of corporate trust preferred securities | financial_institution	2