Derivatives - Summary of Fair Value and Location for Rate-Lock and Forward Loan Sale Commitments (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative assets:	$ 13,350	$ 8,766
Derivative liabilities:	13,338	8,785
Mortgage Banking Derivatives
Derivative [Line Items]
Derivative assets:		232
Derivative liabilities:		105
Other assets
Derivative [Line Items]
Derivative assets:	407
Other assets | Total mortgage derivative commitments
Derivative [Line Items]
Derivative assets:	377	210
Other assets | Mortgage loan commitments best efforts
Derivative [Line Items]
Derivative assets:	206	210
Other assets | Mortgage loan commitments mandatory delivery
Derivative [Line Items]
Derivative assets:	171	0
Other assets | Total forward loan sale commitments
Derivative [Line Items]
Derivative assets:	30	22
Other assets | Forward loan sale commitments best efforts
Derivative [Line Items]
Derivative assets:	30	22
Other assets | Forward loan sale commitments mandatory delivery
Derivative [Line Items]
Derivative assets:	0	0
Other liabilities
Derivative [Line Items]
Derivative liabilities:	137
Other liabilities | Total mortgage derivative commitments
Derivative [Line Items]
Derivative liabilities:	16	36
Other liabilities | Mortgage loan commitments best efforts
Derivative [Line Items]
Derivative liabilities:	16	36
Other liabilities | Mortgage loan commitments mandatory delivery
Derivative [Line Items]
Derivative liabilities:	0	0
Other liabilities | Total forward loan sale commitments
Derivative [Line Items]
Derivative liabilities:	121	69
Other liabilities | Forward loan sale commitments best efforts
Derivative [Line Items]
Derivative liabilities:	66	69
Other liabilities | Forward loan sale commitments mandatory delivery
Derivative [Line Items]
Derivative liabilities:	$ 55	$ 0