Fair Value Measurements Financial Instruments, Quantitative Information (Details)	9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Time deposits [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	0.03%	0.02%	0.02%
Contractual Yield, Maximum	9.65%	9.64%	5.50%
Repricing (in years)	2 years 37 days	1 year 274 days	1 year 285 days
Discount Rate, Minimum	1.37%	0.85%	1.11%
Discount Rate, Maximum	1.66%	1.25%	1.57%
Other borrowings [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	0.25%	0.25%	0.25%
Contractual Yield, Maximum	3.81%	3.34%	3.40%
Repricing (in years)	7 days	7 days	1 day
Discount Rate, Minimum	0.29%	0.07%	0.20%
Discount Rate, Maximum	2.99%	2.66%	2.89%
Subordinated debentures [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	5.38%	1.01%	1.05%
Contractual Yield, Maximum	5.38%	1.01%	1.05%
Repricing (in years)	18 years 135 days	1 year 230 days	1 year 135 days
Discount Rate, Minimum	5.38%	1.83%	2.12%
Discount Rate, Maximum	5.38%	1.83%	2.12%
Commercial | Loans Receivable [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	0.38%	0.19%	0.25%
Contractual Yield, Maximum	30.00%	30.00%	30.00%
Repricing (in years)	252 days	230 days	226 days
Discount Rate, Minimum	0.54%	0.47%	0.52%
Discount Rate, Maximum	3.93%	4.06%	4.34%
Commercial real estate | Loans Receivable [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	0.38%	0.38%	0.38%
Contractual Yield, Maximum	18.00%	18.00%	18.00%
Repricing (in years)	263 days	281 days	266 days
Discount Rate, Minimum	0.80%	0.92%	0.95%
Discount Rate, Maximum	3.90%	3.60%	3.93%
Residential mortgage | Loans Receivable [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	1.74%	1.25%	1.67%
Contractual Yield, Maximum	18.00%	18.00%	18.00%
Repricing (in years)	1 year 347 days	2 years 124 days	2 years 153 days
Discount Rate, Minimum	1.57%	0.86%	0.86%
Discount Rate, Maximum	3.55%	3.94%	4.25%
Personal | Loans Receivable [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	0.25%	0.38%	0.38%
Contractual Yield, Maximum	21.00%	21.00%	21.00%
Repricing (in years)	128 days	146 days	135 days
Discount Rate, Minimum	0.75%	0.89%	1.19%
Discount Rate, Maximum	4.15%	3.86%	4.11%