Investment Securities - Narrative (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) security	Dec. 31, 2016 USD ($)
Investments, Debt and Equity Securities [Abstract]
Number of private-label collateralized mortgage obligations | security	2
Combined balance of private-label collateralized mortgage obligations	$ 15,000
AFS and HTM securities in unrealized loss positions qualitative disclosure number of positions | security	64
Unrealized losses as a percentage of individual securities amortized cost basis	1.96%
Unrealized losses as percentage of Company's total amortized cost basis	1.07%
Number of securities in an unrealized loss position for over 12 months | security	10
Amortized cost basis of securities in a continuous loss position	$ 23,100,000
Unrealized loss on securities in a continuous loss position	684,000
Impairment related to credit quality	$ 0
Securities sold, classified as available-for-sale | security	10
Number Of Held to Maturity Securities Sold | security	1
Available-for-sale securities, realized gain (loss)	$ (1,000)
Held-to-maturity Securities, Sold Security, Realized Gain (Loss)	$ 7,000
Number of available-for-sale securities sold with gains | security	7
Available-for-sale securities, gross realized gains	$ 108,000
Number of available-for-sale securities sold with losses | security	3
Available-for-sale securities, gross realized losses	$ 109,000
Securities pledged as collateral for public funding	$ 295,600,000	$ 293,400,000