Fair Value Measurements Fair Value Measurements, Financial Instruments, Quantitative Information (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Time Deposits [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	0.02%	0.02%
Contractual Yield, Maximum	9.65%	5.50%
Repricing (in years)	1 year 350 days	1 year 285 days
Discount Rate, Minimum	1.57%	1.11%
Discount Rate, Maximum	2.00%	1.57%
Other borrowings [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	0.25%	0.25%
Contractual Yield, Maximum	3.50%	3.40%
Repricing (in years)	1 day	1 day
Discount Rate, Minimum	0.55%	0.20%
Discount Rate, Maximum	3.22%	2.89%
Subordinated debentures [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	5.38%	1.05%
Contractual Yield, Maximum	5.38%	1.05%
Repricing (in years)	16 years 314 days	1 year 135 days
Discount Rate, Minimum	5.38%	2.12%
Discount Rate, Maximum	5.38%	2.12%
Commercial [Member] | Loans [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	0.38%	0.25%
Contractual Yield, Maximum	30.00%	30.00%
Repricing (in years)	256 days	226 days
Discount Rate, Minimum	0.64%	0.52%
Discount Rate, Maximum	4.60%	4.34%
Commercial Real Estate [Member] | Loans [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	0.38%	0.38%
Contractual Yield, Maximum	18.00%	18.00%
Repricing (in years)	259 days	266 days
Discount Rate, Minimum	0.94%	0.95%
Discount Rate, Maximum	4.27%	3.93%
Residential Mortgage [Member] | Loans [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	1.74%	1.67%
Contractual Yield, Maximum	18.00%	18.00%
Repricing (in years)	2 years 99 days	2 years 153 days
Discount Rate, Minimum	1.71%	0.86%
Discount Rate, Maximum	4.26%	4.25%
Personal [Member] | Loans [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	0.25%	0.38%
Contractual Yield, Maximum	21.00%	21.00%
Repricing (in years)	146 days	135 days
Discount Rate, Minimum	1.03%	1.19%
Discount Rate, Maximum	4.59%	4.11%