Shareholders' Equity, Dividends Restrictions and Other Regulatory Matters (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Risk Based Capital to Risk Weighted Assets	14.26%
Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	4.00%
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%
Leverage Capital Required Ratio To Tangible Assets	3.00%
Trust Preferred Securities	$ 93,500,000
Percent Of Trust Preferred Securities Excluded From Tier One Starting In 2013	75.00%
Proforma Tier 1 Leverage Ratio	9.38%
Proforma Tier 1 Risk Based Ratio	14.26%
Proforma Total Risk Based Ratio	15.76%
Tier 2 capital	25,000,000	50,000,000
Stock Repurchased During Period, Shares	0
Amount Available for Dividend Distribution without Prior Approval from Regulatory Agency	1,410,000,000
Maximum Undivided Profits Elgible For Dividend Payment Without Changing Well Capitalized Status	781,300,000
Average Required Maintence Of Non Interst Bearing Reserve Balance	313,400,000
Common Class A [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Votes per share of common stock	1
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	100,000	100,000
Stock Repurchased During Period, Shares		56,276
Class B Common Stock
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Votes per share of common stock	16
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	25,000	25,000
Stock Repurchased During Period, Shares	0	100
Stock Repurchased and Retired During Period, Shares		606,829
Class B Common Stock | Majority Shareholder [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Stock Repurchased and Retired During Period, Shares		593,954
BancShares [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital for Capital Adequacy	2,109,139,000	1,949,985,000
Capital Required for Capital Adequacy	2,320,792,000	2,179,370,000
Leverage Capital Required for Capital Adequacy	2,109,139,000	1,949,985,000
Tier 1 Risk Based Capital to Risk Weighted Assets	14.92%	14.27%
Capital to Risk Weighted Assets	16.42%	15.95%
Leverage Capital to Average Assets	9.82%	9.23%
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%	6.00%
Capital Required to be Well Capitalized	10.00%	10.00%
Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%
FCB [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Capital for Capital Adequacy	1,983,349,000	1,942,101,000
Capital Required for Capital Adequacy	2,184,461,000	2,163,034,000
Leverage Capital Required for Capital Adequacy	1,983,349,000	1,942,101,000
Tier 1 Risk Based Capital to Risk Weighted Assets	14.14%	14.37%
Capital to Risk Weighted Assets	15.57%	16.00%
Leverage Capital to Average Assets	9.36%	9.34%
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%	6.00%
Capital Required to be Well Capitalized	10.00%	10.00%
Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%
Parent [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Dividends from subsidiaries	$ 131,006,000	$ 179,588,000	$ 82,812,000