Fair Value Measurements Financial Instruments, Quantitative Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Time deposits [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	0.02%	0.02%	0.02%
Contractual Yield, Maximum	10.00%	9.64%	5.50%
Repricing (in years)	2 years 18 days	1 year 288 days	1 year 285 days
Discount Rate, Minimum	1.15%	0.78%	1.11%
Discount Rate, Maximum	1.47%	1.24%	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	0.80%	4.78%	3.40%
Repricing (in years)	1 day	7 days	1 day
Discount Rate, Minimum	0.25%	0.06%	0.20%
Discount Rate, Maximum	2.89%	2.64%	2.89%
Subordinated debentures [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	1.31%	0.92%	1.05%
Contractual Yield, Maximum	1.31%	5.00%	1.05%
Repricing (in years)	1 year 44 days	1 year 157 days	1 year 135 days
Discount Rate, Minimum	2.13%	2.11%	2.12%
Discount Rate, Maximum	2.13%	2.11%	2.12%
Commercial [Member] | Loans Receivable [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	0.38%	0.18%	0.25%
Contractual Yield, Maximum	30.00%	30.00%	30.00%
Repricing (in years)	267 days	252 days	226 days
Discount Rate, Minimum	0.46%	0.49%	0.52%
Discount Rate, Maximum	3.92%	4.15%	4.34%
Commercial Real Estate [Member] | 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	303 days	266 days
Discount Rate, Minimum	0.85%	1.03%	0.95%
Discount Rate, Maximum	3.60%	3.63%	3.93%
Residential Mortgage [Member] | Loans Receivable [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	1.68%	1.20%	1.67%
Contractual Yield, Maximum	18.00%	18.00%	18.00%
Repricing (in years)	2 years 26 days	2 years 77 days	2 years 153 days
Discount Rate, Minimum	1.23%	0.70%	0.86%
Discount Rate, Maximum	3.73%	3.84%	4.25%
Personal [Member] | Loans Receivable [Member]
Fair Value Inputs, Financial Instruments, Quantitative Information [Line Items]
Contractual Yield, Minimum	0.38%	0.38%	0.38%
Contractual Yield, Maximum	21.00%	21.00%	21.00%
Repricing (in years)	135 days	157 days	135 days
Discount Rate, Minimum	0.78%	0.99%	1.19%
Discount Rate, Maximum	4.01%	3.88%	4.11%