Securities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Available-for-sale
Available-for-sale, Amortized Cost	$ 973,752	$ 1,000,505
Available-for-sale, Gross Unrealized Gains	20,225	21,363
Available-for-sale, Gross Unrealized Losses	(707)	(624)
Available-for-sale, Estimated Fair Value	993,270	1,021,244
Held-to-maturity
Held-to-maturity, Amortized cost	592,033	602,509
Held-to-maturity, Gross Unrealized Gains	34,456	37,673
Held-to-maturity, Gross Unrealized Losses	(1,862)	(909)
Held-to-maturity securities, Fair value	624,627	639,273
Total securities, Amortized Cost	1,565,785	1,603,014
Total securities, Gross Unrealized Gains	54,681	59,036
Total securities, Gross Unrealized Losses	(2,569)	(1,533)
Total securities, Estimated Fair Value	1,617,897	1,660,517
Other government agencies [Member]
Available-for-sale
Available-for-sale, Amortized Cost	65,281	96,257
Available-for-sale, Gross Unrealized Gains	199	411
Available-for-sale, Gross Unrealized Losses	(31)	(56)
Available-for-sale, Estimated Fair Value	65,449	96,612
Residential mortgage-backed securities and collateralized mortgage obligations of government agencies [Member]
Available-for-sale
Available-for-sale, Amortized Cost	729,647	721,824
Available-for-sale, Gross Unrealized Gains	9,822	10,690
Available-for-sale, Gross Unrealized Losses	(527)	(304)
Available-for-sale, Estimated Fair Value	738,942	732,210
Held-to-maturity
Held-to-maturity, Amortized cost	133,186	152,872
Held-to-maturity, Gross Unrealized Gains	5,626	6,421
Held-to-maturity, Gross Unrealized Losses	(69)	(80)
Held-to-maturity securities, Fair value	138,743	159,213
Other residential collateralized mortgage obligations [Member]
Held-to-maturity
Held-to-maturity, Amortized cost	305	353
Held-to-maturity, Gross Unrealized Gains	7	8
Held-to-maturity, Gross Unrealized Losses
Held-to-maturity securities, Fair value	312	361
Obligations of state and political subdivisions [Member]
Available-for-sale
Available-for-sale, Amortized Cost	130,913	139,511
Available-for-sale, Gross Unrealized Gains	8,754	9,133
Available-for-sale, Gross Unrealized Losses	(47)	(9)
Available-for-sale, Estimated Fair Value	139,620	148,635
Held-to-maturity
Held-to-maturity, Amortized cost	458,542	449,284
Held-to-maturity, Gross Unrealized Gains	28,823	31,244
Held-to-maturity, Gross Unrealized Losses	(1,793)	(829)
Held-to-maturity securities, Fair value	485,572	479,699
Corporate debt securities [Member]
Available-for-sale
Available-for-sale, Amortized Cost	37,959	32,706
Available-for-sale, Gross Unrealized Gains	239	213
Available-for-sale, Gross Unrealized Losses	(62)	(234)
Available-for-sale, Estimated Fair Value	38,136	32,685
Debt securities [Member]
Available-for-sale
Available-for-sale, Amortized Cost	963,800	990,298
Available-for-sale, Gross Unrealized Gains	19,014	20,447
Available-for-sale, Gross Unrealized Losses	(667)	(603)
Available-for-sale, Estimated Fair Value	982,147	1,010,142
Equity securities [Member]
Available-for-sale
Available-for-sale, Amortized Cost	9,952	10,207
Available-for-sale, Gross Unrealized Gains	1,211	916
Available-for-sale, Gross Unrealized Losses	(40)	(21)
Available-for-sale, Estimated Fair Value	$ 11,123	$ 11,102

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

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