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

12 Months Ended

Dec. 31, 2020

Broker-Dealer, Net Capital Requirement, SEC Regulation [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, 2020 and 2019:

			December 31, 2020				December 31, 2019
(Dollars in thousands)	Requirements to be well-capitalized		Amount		Ratio		Amount		Ratio
BancShares
Total risk-based capital	10.00	%	$	4,577,212	13.81	%	$	3,731,501	12.12	%
Tier 1 risk-based capital	8.00		3,856,086		11.63		3,344,305		10.86
Common equity Tier 1	6.50		3,516,149		10.61		3,344,305		10.86
Leverage capital	5.00		3,856,086		7.86		3,344,305		8.81
FCB
Total risk-based capital	10.00		4,543,496		13.72		3,837,670		12.46
Tier 1 risk-based capital	8.00		4,276,870		12.92		3,554,974		11.54
Common equity Tier 1	6.50		4,276,870		12.92		3,554,974		11.54
Leverage capital	5.00		4,276,870		8.72		3,554,974		9.38