Summary of Significant Accounting Policies - Intangible assets, Transfer of financial assets (Details 5) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Intangible Assets
Impairment Charges	$ 0
Transfer of Financial Assets
Term of fixed-rate mortgage loans	30 years
Minimum
Intangible Assets
Estimated useful lives of intangibles	2 years
Maximum
Intangible Assets
Estimated useful lives of intangibles	15 years
Core deposit intangibles | Minimum
Intangible Assets
Estimated useful lives of intangibles	7 years
Core deposit intangibles | Maximum
Intangible Assets
Estimated useful lives of intangibles	13 years
Noncompete intangibles | Minimum
Intangible Assets
Estimated useful lives of intangibles	2 years
Noncompete intangibles | Maximum
Intangible Assets
Estimated useful lives of intangibles	3 years
Client list intangibles
Intangible Assets
Estimated useful lives of intangibles	15 years