Investment securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Other securities, Amortized Cost	$ 302,648	$ 366,886
Other securities, Gross Unrealized Gains
Other securities, Gross Unrealized Losses
Other securities, Estimated Fair Value	302,648	366,886
Investment securities, available for sale, amortized cost	4,643,070	6,312,423
Gross Unrealized Gains	253,619	210,001
Gross Unrealized Losses	157,252	293,864
Estimated Fair Value	4,739,437	6,228,560
Amortized cost for held to maturity	1,032,276	1,077,708
Gross unrealized gains for held to maturity	39,534	34,022
Gross unrealized losses for held to maturity	94,927	99,168
Estimated fair value for held to maturity	976,883	1,012,562
Total Amortized cost	5,977,994	7,757,017
Total for Gross unrealized gains	293,153	244,023
Total for Gross unrealized losses	252,179	393,032
Total for Estimated fair value	6,018,968	7,608,008
Collateralized debt obligations [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Investment securities, available for sale, amortized cost	43,228	43,834
Gross Unrealized Gains	19,663	11,154
Gross Unrealized Losses	1,022	2,488
Estimated Fair Value	61,869	52,500
Obligations of states and political subdivisions [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Investment securities, available for sale, amortized cost	20,375	39,518
Gross Unrealized Gains	534	771
Gross Unrealized Losses	8	20
Estimated Fair Value	20,901	40,269
Amortized cost for held to maturity	182,103	188,680
Gross unrealized gains for held to maturity	7,647	9,141
Gross unrealized losses for held to maturity	27	28
Estimated fair value for held to maturity	189,723	197,793
Mortgage-backed securities [Member] \| Government issued or guaranteed [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Investment securities, available for sale, amortized cost	3,163,210	4,344,116
Gross Unrealized Gains	208,060	177,392
Gross Unrealized Losses	229	275
Estimated Fair Value	3,371,041	4,521,233
Amortized cost for held to maturity	597,340	608,533
Gross unrealized gains for held to maturity	31,727	24,881
Estimated fair value for held to maturity	629,067	633,414
Mortgage-backed securities [Member] \| Privately issued [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Amortized cost for held to maturity	242,378	268,642
Gross unrealized gains for held to maturity	160
Gross unrealized losses for held to maturity	94,900	99,140
Estimated fair value for held to maturity	147,638	169,502
Mortgage-backed securities [Member] \| Privately issued residential [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Investment securities, available for sale, amortized cost	1,133,639	1,369,371
Gross Unrealized Gains	4,894	6,373
Gross Unrealized Losses	125,647	239,488
Estimated Fair Value	1,012,886	1,136,256
Mortgage-backed securities [Member] \| Privately issued commercial [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Investment securities, available for sale, amortized cost	8,648	17,679
Gross Unrealized Gains	2,378
Gross Unrealized Losses	26	2,650
Estimated Fair Value	11,000	15,029
Other debt securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Investment securities, available for sale, amortized cost	136,603	216,700
Gross Unrealized Gains	2,247	4,588
Gross Unrealized Losses	26,900	44,443
Estimated Fair Value	111,950	176,845
Amortized cost for held to maturity	10,455	11,853
Estimated fair value for held to maturity	10,455	11,853
U.S. Treasury and federal agencies [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Investment securities, available for sale, amortized cost	38,422	69,468
Gross Unrealized Gains	922	1,255
Estimated Fair Value	39,344	70,723
Equity securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]
Investment securities, available for sale, amortized cost	98,945	211,737
Gross Unrealized Gains	14,921	8,468
Gross Unrealized Losses	3,420	4,500
Estimated Fair Value	$ 110,446	$ 215,705

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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