Securities Available-for-sale - Unrealized Gains (Losses) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Total unrealized gains/(losses) on securities available for sale, Gross Unrealized Gains	$ 16,250	$ 12,647
Total unrealized gains/(losses) on securities available for sale, Gross Unrealized Losses	(457)	(1,837)
Total unrealized gains/(losses) on securities available for sale, Net Unrealized Gains/(Losses)	15,793	10,810
Income Tax expense/(benefit), Gross Unrealized Gains	5,688	4,426
Income Tax expense/(benefit), Gross Unrealized Losses	(160)	(643)
Income Tax expense/(benefit), Net Unrealized Gains/ (Losses)	5,528	3,783
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Gains	10,562	8,221
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Losses	(297)	(1,194)
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Net Unrealized Gains/ (Losses)	$ 10,265	$ 7,027