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Securities - Securities, with Unrealized Losses Segregated by Length of Impairment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014
Schedule of Available-for-Sale Securities [Line Items] |
Held to Maturity, Less than 12 Months, Estimated Fair Value | $ 916,127
Held to Maturity, Less than 12 Months, Unrealized Losses | 20,193
Held to Maturity, More than 12 Months, Estimated Fair Value | 1,338,645
Held to Maturity, More than 12 Months, Unrealized Losses | 46,986
Held to Maturity, Total Estimated Fair Value | 2,254,772
Held to Maturity, Total Unrealized Losses | 67,179
Available for Sale, Less than 12 Months, Estimated Fair Value | 648,406
Available for Sale, Less than 12 Months, Unrealized Losses | 4,447
Available for Sale, More than 12 Months, Estimated Fair Value | 2,745
Available for Sale, More than 12 Months, Unrealized Losses | 232
Available for Sale, Total Estimated Fair Value | 651,151
Available for Sale, Total Unrealized Losses | 4,679
Residential mortgage- backed securities [Member] |
Schedule of Available-for-Sale Securities [Line Items] |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 6,967
Held to Maturity, Less than 12 Months, Unrealized Losses | 58
Held to Maturity, More than 12 Months, Estimated Fair Value | 0
Held to Maturity, More than 12 Months, Unrealized Losses | 0
Held to Maturity, Total Estimated Fair Value | 6,967
Held to Maturity, Total Unrealized Losses | 58
Available for Sale, Less than 12 Months, Estimated Fair Value | 14,598
Available for Sale, Less than 12 Months, Unrealized Losses | 804
Available for Sale, More than 12 Months, Estimated Fair Value | 2,745
Available for Sale, More than 12 Months, Unrealized Losses | 232
Available for Sale, Total Estimated Fair Value | 17,343
Available for Sale, Total Unrealized Losses | 1,036
States and political subdivisions [Member] |
Schedule of Available-for-Sale Securities [Line Items] |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 909,160
Held to Maturity, Less than 12 Months, Unrealized Losses | 20,135
Held to Maturity, More than 12 Months, Estimated Fair Value | 1,338,645
Held to Maturity, More than 12 Months, Unrealized Losses | 46,986
Held to Maturity, Total Estimated Fair Value | 2,247,805
Held to Maturity, Total Unrealized Losses | 67,121
Available for Sale, Less than 12 Months, Estimated Fair Value | 332,824
Available for Sale, Less than 12 Months, Unrealized Losses | 2,190
Available for Sale, More than 12 Months, Estimated Fair Value | 0
Available for Sale, More than 12 Months, Unrealized Losses | 0
Available for Sale, Total Estimated Fair Value | 332,824
Available for Sale, Total Unrealized Losses | 2,190
U.S. Treasury [Member] |
Schedule of Available-for-Sale Securities [Line Items] |
Available for Sale, Less than 12 Months, Estimated Fair Value | 300,984
Available for Sale, Less than 12 Months, Unrealized Losses | 1,453
Available for Sale, More than 12 Months, Estimated Fair Value | 0
Available for Sale, More than 12 Months, Unrealized Losses | 0
Available for Sale, Total Estimated Fair Value | 300,984
Available for Sale, Total Unrealized Losses | $ 1,453

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