Regulatory Matters - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2016	Jan. 01, 2016
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
CET1 capital ratio, for capital adequacy purposes ratio	4.50%
CET1 leverage ratio, to be well-capitalized under prompt corrective action provisions ratio	6.50%
Capital buffer against risk weighted assets percentage		0.625%
Capital buffer against risk weighted assets increasing percentage annually	0.625%
Capital buffer against risk weighted assets cumulative	2.50%
FFB
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
CET1 capital ratio, to be well-capitalized amount	$ 127.5
Tier 1 leverage ratio, to be well-capitalized amount	109.3
Tier 1 risk-based capital ratio, to be well-capitalized amount	94.1
Excess total risk-based capital ratio, to be well-capitalized amount	$ 65.5