Consolidated Statement of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Interest income
Loans and leases, including fees	$ 647,179	$ 645,222
Deposits at banks	3,118us-gaap_InterestIncomeDomesticDeposits	1,884us-gaap_InterestIncomeDomesticDeposits
Federal funds sold	24us-gaap_InterestIncomeFederalFundsSold	16us-gaap_InterestIncomeFederalFundsSold
Trading account	491	427
Investment securities
Fully taxable	85,957us-gaap_InterestIncomeSecuritiesTaxable	73,899us-gaap_InterestIncomeSecuritiesTaxable
Exempt from federal taxes	1,318	1,504
Total interest income	738,087	722,952
Interest expense
NOW accounts	311	297
Savings deposits	10,219us-gaap_InterestExpenseSavingsDeposits	11,601us-gaap_InterestExpenseSavingsDeposits
Time deposits	3,740us-gaap_InterestExpenseTimeDeposits	3,940us-gaap_InterestExpenseTimeDeposits
Deposits at Cayman Islands office	147us-gaap_InterestExpenseForeignDeposits	208us-gaap_InterestExpenseForeignDeposits
Short-term borrowings	34	32
Long-term borrowings	64,048us-gaap_InterestExpenseLongTermDebt	50,441us-gaap_InterestExpenseLongTermDebt
Total interest expense	78,499us-gaap_InterestExpense	66,519us-gaap_InterestExpense
Net interest income	659,588us-gaap_InterestIncomeExpenseNet	656,433us-gaap_InterestIncomeExpenseNet
Provision for credit losses	38,000us-gaap_ProvisionForLoanAndLeaseLosses	32,000us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for credit losses	621,588	624,433
Other income
Mortgage banking revenues	101,601	80,049
Service charges on deposit accounts	102,344	104,198
Trust income	123,734	121,252
Brokerage services income	15,461us-gaap_BrokerageCommissionsRevenue	16,500us-gaap_BrokerageCommissionsRevenue
Trading account and foreign exchange gains	6,231us-gaap_TradingGainsLosses	6,447us-gaap_TradingGainsLosses
Loss on bank investment securities	(98)us-gaap_GainLossOnSaleOfSecuritiesNet
Equity in earnings of Bayview Lending Group LLC	(4,191)	(4,454)
Other revenues from operations	95,121	96,115
Total other income	440,203us-gaap_NoninterestIncome	420,107us-gaap_NoninterestIncome
Other expense
Salaries and employee benefits	389,893us-gaap_LaborAndRelatedExpense	371,326us-gaap_LaborAndRelatedExpense
Equipment and net occupancy	66,470us-gaap_OccupancyNet	71,167us-gaap_OccupancyNet
Printing, postage and supplies	9,590us-gaap_SuppliesAndPostageExpense	10,956us-gaap_SuppliesAndPostageExpense
Amortization of core deposit and other intangible assets	6,793us-gaap_AmortizationOfIntangibleAssets	10,062us-gaap_AmortizationOfIntangibleAssets
FDIC assessments	10,660	15,488
Other costs of operations	202,969us-gaap_OtherNoninterestExpense	211,235us-gaap_OtherNoninterestExpense
Total other expense	686,375us-gaap_NoninterestExpense	690,234us-gaap_NoninterestExpense
Income before taxes	375,416	354,306
Income taxes	133,803us-gaap_IncomeTaxExpenseBenefit	125,289us-gaap_IncomeTaxExpenseBenefit
Net income	241,613us-gaap_NetIncomeLoss	229,017us-gaap_NetIncomeLoss
Net income available to common shareholders
Basic	218,830	211,720
Diluted	$ 218,837	$ 211,731
Net income per common share
Basic	$ 1.66us-gaap_EarningsPerShareBasic	$ 1.63us-gaap_EarningsPerShareBasic
Diluted	$ 1.65us-gaap_EarningsPerShareDiluted	$ 1.61us-gaap_EarningsPerShareDiluted
Cash dividends per common share	$ 0.70	$ 0.70
Average common shares outstanding
Basic	132,049	130,212
Diluted	132,769	131,126

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