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Loans and Allowance for Loan Losses - Summary of Consumer Loans by Payment Status (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Credit Quality [Line Items]
Loans, net of unearned income	$ 9,943,136	$ 9,506,094
Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	79,423	77,453
Direct Installment [Member]
Credit Quality [Line Items]
Loans, net of unearned income	1,467,558	1,467,236
Direct Installment [Member] \| Performing [Member]
Credit Quality [Line Items]
Performing Loans	1,374,893	1,377,418
Direct Installment [Member] \| Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	12,047	10,577
Residential Mortgages [Member]
Credit Quality [Line Items]
Loans, net of unearned income	1,135,790	1,086,739
Residential Mortgages [Member] \| Performing [Member]
Credit Quality [Line Items]
Performing Loans	674,077	664,214
Residential Mortgages [Member] \| Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	13,961	14,013
Indirect Installment [Member]
Credit Quality [Line Items]
Loans, net of unearned income	678,918	655,587
Indirect Installment [Member] \| Performing [Member]
Credit Quality [Line Items]
Performing Loans	672,948	648,499
Indirect Installment [Member] \| Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	1,399	1,202
Consumer Lines of Credit [Member] \| Performing [Member]
Credit Quality [Line Items]
Performing Loans	847,961	832,071
Consumer Lines of Credit [Member] \| Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	922	597
Other [Member]
Credit Quality [Line Items]
Loans, net of unearned income	59,212	45,183
Other [Member] \| Performing [Member]
Credit Quality [Line Items]
Performing Loans	59,212	45,183
Other [Member] \| Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans
Originated Loans [Member]
Credit Quality [Line Items]
Loans, net of unearned income	8,344,398	8,154,765
Originated Loans [Member] \| Direct Installment [Member]
Credit Quality [Line Items]
Loans, net of unearned income	1,386,940	1,387,995
Originated Loans [Member] \| Residential Mortgages [Member]
Credit Quality [Line Items]
Loans, net of unearned income	688,038	678,227
Originated Loans [Member] \| Indirect Installment [Member]
Credit Quality [Line Items]
Loans, net of unearned income	674,347	649,701
Originated Loans [Member] \| Consumer Lines of Credit [Member]
Credit Quality [Line Items]
Loans, net of unearned income	848,883	832,668
Originated Loans [Member] \| Other [Member]
Credit Quality [Line Items]
Loans, net of unearned income	$ 59,212	$ 45,183