Securities Available-for-sale - Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Total unrealized gains/(losses) on securities available for sale, Gross Unrealized Gains	$ 15,346	$ 12,647
Total unrealized gains/(losses) on securities available for sale, Gross Unrealized Losses	(214)	(1,837)
Total unrealized gains/(losses) on securities available for sale, Net Unrealized Gains/(Losses)	15,132	10,810
Income tax expense/(benefit), Gross Unrealized Gains	5,371	4,426
Income tax expense/(benefit), Gross Unrealized Losses	(75)	(643)
Income tax expense/(benefit), Net Unrealized Gains/ (Losses)	5,296	3,783
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Gains	9,975	8,221
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Losses	(139)	(1,194)
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Net Unrealized Gains/ (Losses)	$ 9,836	$ 7,027