Regulatory Matters - Narrative (Details)	Sep. 30, 2015	Jan. 01, 2015	Dec. 31, 2014
Banking and Thrift [Abstract]
Tier 1 capital (to risk weighted assets), for capital adequacy purposes ratio	6.00%		4.00%
Tier 1 capital (to risk weighted assets), to be well capitalized under prompt corrective action provisions ratio	8.00%
Capital conservation buffer, excess of minimum capital ratio		2.50%
Capital conservation buffer to risk weighted assets, year one	0.625%
Capital conservation buffer to risk weighted assets, year two	1.25%
Capital conservation buffer to risk weighted assets, year three	1.875%
Capital conservation buffer to risk weighted assets, year four and thereafter	2.50%