Fair Value - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) Region	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Nonfinancial Assets and Liabilities [Abstract]
Outstanding balances in impaired loans	$ 39,100		$ 27,100
Key market regions | Region	5
Foreclosed assets re-measured after initial recognition	$ 10,300	$ 12,200
Write-downs of allowance for foreclosed assets after initial recognition	1,500	1,100
Noninterest gain in Mortgage banking, net for changes in fair value of LHFS	3,600	2,800
Interest earned on LHFS included in Interest and fees on LHFS and LHFI	1,100	$ 867
GNMA optional repurchase loans	$ 38,900		$ 43,900
Maximum [Member]
Nonfinancial Assets and Liabilities [Abstract]
Estimated fair value of financial instruments with immediate and shorter-term maturities	90 days