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

12 Months Ended

Dec. 31, 2018

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, 2018 and 2017:

	December 31, 2018						December 31, 2017
(Dollars in thousands)	Amount		Ratio		Requirements to be well-capitalized		Amount		Ratio		Requirements to be well-capitalized
BancShares
Tier 1 risk-based capital	$	3,463,307	12.67	%	8.00	%	$	3,287,364	12.88	%	8.00	%
Common equity Tier 1	3,463,307		12.67		6.50		3,287,364		12.88		6.50
Total risk-based capital	3,826,626		13.99		10.00		3,626,789		14.21		10.00
Leverage capital	3,463,307		9.77		5.00		3,287,364		9.47		5.00
FCB
Tier 1 risk-based capital	3,315,742		12.17		8.00		3,189,709		12.54		8.00
Common equity Tier 1	3,315,742		12.17		6.50		3,189,709		12.54		6.50
Total risk-based capital	3,574,561		13.12		10.00		3,422,634		13.46		10.00
Leverage capital	3,315,742		9.39		5.00		3,189,709		9.22		5.00