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

12 Months Ended

Dec. 31, 2019

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, 2019 and 2018:

			December 31, 2019				December 31, 2018
(Dollars in thousands)	Requirements to be well-capitalized		Amount		Ratio		Amount		Ratio
BancShares
Tier 1 risk-based capital	8.00	%	$	3,344,305	10.86	%	$	3,463,307	12.67	%
Common equity Tier 1	6.50		3,344,305		10.86		3,463,307		12.67
Total risk-based capital	10.00		3,731,501		12.12		3,826,626		13.99
Leverage capital	5.00		3,344,305		8.81		3,463,307		9.77
FCB
Tier 1 risk-based capital	8.00		3,554,974		11.54		3,315,742		12.17
Common equity Tier 1	6.50		3,554,974		11.54		3,315,742		12.17
Total risk-based capital	10.00		3,837,670		12.46		3,574,561		13.12
Leverage capital	5.00		3,554,974		9.38		3,315,742		9.39