Regulatory and Capital Matters (Details) - Narrative - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash reserve balance	$ 85,400,000	$ 66,900,000
Adjustment to available dividends	32,800,000
Regulatory capital requirements under banking regulations, inclusion of trust-preferred securities in Tier One capital calculation (less than)	15,000,000,000
Trust-preferred securities included in Tier 1 capital	$ 50,700,000
Tier 1 risk based capital conservation buffer initial requirements phasing duration	4 years
Implementation of deductions and other adjustments to CET1, percentage			40.00%
Implementation of deductions and other adjustments to CET1 additional, percentage	20.00%
Risk weighted threshold of items deducted from CET1 capital	10.00%
Aggregate risk weighted threshold of items deducted from CET1	15.00%
Minimum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Risk-weighting	0.00%
Maximum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Risk-weighting	600.00%
January 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum ratio of CET1 to risk-weighted assets	4.50%
Capital conservation buffer	2.50%
Resulting minimum ratio of CET1 to risk-weighted assets after capital conversion buffer	7.00%
Minimum ratio of Tier 1 capital to risk-weighted assets	6.00%
Minimum ratio of Tier 1 capital to risk-weighted assets, adjusted	8.50%
Minimum ratio of Total capital to risk-weighted assets	8.00%
Minimum ratio of Total capital to risk-weighted assets, adjusted	10.50%
Minimum leverage ratio	4.00%