Investment Securities - Narrative (Details)	9 Months Ended
	Sep. 30, 2015 USD ($) security	Sep. 30, 2014 USD ($) security	Dec. 31, 2014 USD ($)
Investments, Debt and Equity Securities [Abstract]
Number of private-label collateralized mortgage obligations | security	2
Combined balance of private-label collateralized mortgage obligations	$ 34,000
AFS and HTM securities in unrealized loss positions qualitative disclosure number of positions | security	42
Unrealized losses as a percentage of individual securities amortized cost basis	1.21%
Unrealized losses as percentage of Company's total amortized cost basis	0.36%
Number of securities in an unrealized loss position for over 12 months | security	20
Unamortized cost basis of securities in a continuous loss position	$ 59,400,000
Unrealized loss on securities in a continuous loss position	1,200,000
Impairment related to credit quality	$ 0
Securities sold, classified as available-for-sale | security	21	4
Available-for-sale securities, realized gain (loss)	$ 1,200,000	$ 128,000
Number of available-for-sale securities sold with gains | security	11
Available-for-sale securities, gross realized gains	$ 1,400,000
Number of available-for-sale securities sold with losses | security	10
Available-for-sale securities, gross realized losses	$ 135,000
Securities pledged as collateral for public funding	$ 287,200,000		$ 279,800,000