Shareholders' Equity, Dividends Restrictions and Other Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2016

Regulatory Capital Requirements [Abstract]

Schedule of Compliance with Regulatory Capital Requirements

Following is an analysis of capital ratios under Basel III guidelines for BancShares and FCB as of December 31, 2016 and 2015:

	December 31, 2016						December 31, 2015
(Dollars in thousands)	Amount		Ratio		Requirements to be well-capitalized		Amount		Ratio		Requirements to be well-capitalized
BancShares
Tier 1 risk-based capital	$	2,995,557	12.42	%	8.00	%	$	2,831,242	12.65	%	8.00	%
Common equity Tier 1	2,995,557		12.42		6.50		2,799,163		12.51		6.50
Total risk-based capital	3,339,986		13.85		10.00		3,140,212		14.03		10.00
Leverage capital	2,995,557		9.05		5.00		2,831,242		8.96		5.00
FCB
Tier 1 risk-based capital	2,942,829		12.25		8.00		2,821,475		12.64		8.00
Common equity Tier 1	2,942,829		12.25		6.50		2,821,475		12.64		6.50
Total risk-based capital	3,172,757		13.21		10.00		3,038,070		13.61		10.00
Leverage capital	2,942,829		8.94		5.00		2,821,475		8.95		5.00