Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Jan. 01, 2019
Accounting Policies [Abstract]
Performance-based insurance commissions	$ 1.6	$ 1.5
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Capital	4.50%		4.50%
Common Equity Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.50%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	6.00%		6.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%		8.00%
Capital Conservation Buffer	0.625%		2.50%
Capital Conservation Buffer Annual Phase-In Amount	0.625%
Common Equity Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Under Capital Conservation Buffer			7.00%
Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Under Capital Conservation Buffer			8.50%
Capital Required for Capital Adequacy to Risk Weighted Assets Under Capital Conservation Buffer			10.50%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Capital	11.62%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	12.53%
Capital Required for Capital Adequacy to Risk Weighted Assets	13.32%
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Capital	13.10%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	13.41%
Capital Required for Capital Adequacy to Risk Weighted Assets	14.29%