Derivatives and Hedging - Cash Flow Hedges (Details) - Derivatives designated as hedging instrument - Cash flow hedges - Interest Rate Swap - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedges not terminated, net fair value	$ (5,800,000)
Fair value hedges weighted average expected remaining term	1 year 3 months 35 days
Maximum length of time hedged in interest rate cash flow hedge	5 years 3 months 30 days
Interest Rate Cash Flow Hedges [Abstract]
Net change in amount recognized in other comprehensive income	$ 2,709,000	$ 2,059,000
Amount reclassified from accumulated other comprehensive income (loss) into net interest income	0	0
Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedge gain (loss) to be reclassified within twelve months	(678,000)
Interest Rate Cash Flow Hedges [Abstract]
Amount reclassified from accumulated other comprehensive income (loss) into net interest income	519,000	1,047,000
Amount of ineffectiveness recognized in net interest income	$ 0	$ 0