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Securities - Narrative (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]      
Balance at beginning of period $ 17,911,000 $ 19,736,000 $ 19,736,000
Securities Transferred From Available for Sale to Held to Maturity 0   157,100,000
Unrealized gain (loss) on securities transferred from AFS to HTM     (10,200,000)
Unrealized gain (loss) on securities transferred from AFS to HTM, net of tax     (6,700,000)
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]      
Net realized gain on AFS securities 247,000 3,200,000  
Realized gains 3,600,000 3,700,000  
Realized losses 3,300,000 551,000  
Held-to-maturity Securities, Other Disclosure Items [Abstract]      
Sales from HTM portfolio 0 $ 0  
Carrying value of investment securities pledged as collateral $ 1,210,000,000   $ 1,500,000,000