Loans and Allowance for Loan Losses - Changes in Accretable Yield and Nonaccretable Difference of Purchased Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accounts Notes And Loans Receivable [Line Items]
Accretable yield, Beginning balance			$ (1,637)
Accretable yield, Accretion			3,195
Accretable yield, Ending balance	$ (1,039)		(1,039)
Nonaccretable difference, Beginning balance			(8,369)
Nonaccretable difference, Ending balance	(6,058)		(6,058)
Beginning balance	(9,300)		(12,223)
Additions through acquisition		$ (12,514)		$ (12,514)
Charge-offs			472
Sale of credit card portfolio			70
Accretion	814		3,195
Ending balance	(8,486)	(12,514)	(8,486)	(12,514)
Purchased Credit Impaired
Accounts Notes And Loans Receivable [Line Items]
Accretable yield, Beginning balance	(1,248)		(1,637)
Accretable yield, Additions through acquisition		(1,991)		(1,991)
Accretable yield, Principal reductions/ pay-offs	(381)		(1,839)
Accretable yield, Accretion	590		2,437
Accretable yield, Ending balance	(1,039)	(1,991)	(1,039)	(1,991)
Nonaccretable difference, Beginning balance	(6,439)		(8,369)
Nonaccretable difference, Additions through acquisition		(8,508)		(8,508)
Nonaccretable difference, Principal reductions/ pay-offs	381		1,839
Nonaccretable difference, Charge-offs			472
Nonaccretable difference, Ending balance	(6,058)	(8,508)	(6,058)	(8,508)
Purchased Non-impaired
Accounts Notes And Loans Receivable [Line Items]
Accretable yield, Beginning balance	(1,613)		(2,147)
Accretable yield, Additions through acquisition		(1,945)		(1,945)
Accretable yield, Accretion	224		758
Accretable yield, Ending balance	$ (1,389)	(1,945)	(1,389)	(1,945)
Nonaccretable difference, Beginning balance			(70)
Nonaccretable difference, Additions through acquisition		(70)		(70)
Nonaccretable difference, Sale of credit card portfolio			$ 70
Nonaccretable difference, Ending balance		$ (70)		$ (70)