Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Available-for-sale
Available-for-sale, Amortized Cost	$ 1,005,308	$ 998,291
Available-for-sale, Gross unrealized Gains	18,993	19,700
Available-for-sale, Gross Unrealized Losses	(1,177)	(1,651)
Available-for-sale securities, Total	1,023,124	1,016,340
Held-to-maturity
Held-to-maturity, Amortized Cost	572,671	592,925
Held-to-maturity, Gross Unrealized Gains	34,928	28,773
Held-to-maturity, Gross Unrealized Losses	(567)	(226)
Held-to-maturity securities, fair value	607,032	621,472
Total securities, amortized cost	1,577,979	1,591,216
Total securities, gross unrealized gains	53,921	48,473
Total securities, gross unrealized losses	(1,744)	(1,877)
Total securities, estimated fair value	1,630,156	1,637,812
Other Government Agencies [Member]
Available-for-sale
Available-for-sale, Amortized Cost	95,897	197,898
Available-for-sale, Gross unrealized Gains	348	834
Available-for-sale, Gross Unrealized Losses	(175)	(12)
Available-for-sale securities, Total	96,070	198,720
Residential mortgage-backed securities and collateralized mortgage obligations of government agencies [Member]
Available-for-sale
Available-for-sale, Amortized Cost	707,814	579,430
Available-for-sale, Gross unrealized Gains	8,400	9,244
Available-for-sale, Gross Unrealized Losses	(488)	(582)
Available-for-sale securities, Total	715,726	588,092
Held-to-maturity
Held-to-maturity, Amortized Cost	198,870	247,938
Held-to-maturity, Gross Unrealized Gains	7,444	7,223
Held-to-maturity, Gross Unrealized Losses	(58)	(87)
Held-to-maturity securities, fair value	206,256	255,074
Other residential collateralized mortgage obligations [Member]
Held-to-maturity
Held-to-maturity, Amortized Cost	451	783
Held-to-maturity, Gross Unrealized Gains	11	9
Held-to-maturity, Gross Unrealized Losses	0	(1)
Held-to-maturity securities, fair value	462	791
Obligations of States and Political Subdivisions [Member]
Available-for-sale
Available-for-sale, Amortized Cost	158,105	171,782
Available-for-sale, Gross unrealized Gains	9,139	8,664
Available-for-sale, Gross Unrealized Losses	(63)	(13)
Available-for-sale securities, Total	167,181	180,433
Held-to-maturity
Held-to-maturity, Amortized Cost	373,350	342,752
Held-to-maturity, Gross Unrealized Gains	27,473	21,459
Held-to-maturity, Gross Unrealized Losses	(509)	(138)
Held-to-maturity securities, fair value	400,314	364,073
Corporate Debt Securities [Member]
Available-for-sale
Available-for-sale, Amortized Cost	38,745	45,002
Available-for-sale, Gross unrealized Gains	276	107
Available-for-sale, Gross Unrealized Losses	(451)	(1,043)
Available-for-sale securities, Total	38,570	44,066
Held-to-maturity
Held-to-maturity, Amortized Cost		1,452
Held-to-maturity, Gross Unrealized Gains		82
Held-to-maturity, Gross Unrealized Losses
Held-to-maturity securities, fair value		1,534
Debt Securities [Member]
Available-for-sale
Available-for-sale, Amortized Cost	1,000,561	994,112
Available-for-sale, Gross unrealized Gains	18,163	18,849
Available-for-sale, Gross Unrealized Losses	(1,177)	(1,650)
Available-for-sale securities, Total	1,017,547	1,011,311
Equity Securities [Member]
Available-for-sale
Available-for-sale, Amortized Cost	4,747	4,179
Available-for-sale, Gross unrealized Gains	830	851
Available-for-sale, Gross Unrealized Losses		(1)
Available-for-sale securities, Total	$ 5,577	$ 5,029

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

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