Securities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of securities available for sale portfolio
Amortized cost	$ 1,065,447	$ 1,091,497
Unrealized gains	55,144	50,704
Unrealized losses	(9,815)	(12,085)
Fair value, Securities	1,110,776	1,130,116
Trust preferred securities [Member]
Schedule of securities available for sale portfolio
Amortized cost	45,894	45,894
Unrealized gains	367	265
Unrealized losses	(8,234)	(8,615)
Fair value, Securities	38,027	37,544
Municipal securities [Member]
Schedule of securities available for sale portfolio
Amortized cost	177,414	174,288
Unrealized gains	13,717	10,427
Unrealized losses	(244)	(230)
Fair value, Securities	190,887	184,485
Equity securities [Member]
Schedule of securities available for sale portfolio
Amortized cost	1,142	1,754
Unrealized gains	676	351
Unrealized losses		(2)
Fair value, Securities	1,818	2,103
Corporate bonds [Member]
Schedule of securities available for sale portfolio
Amortized cost	219,700	165,923
Unrealized gains	7,186	1,784
Unrealized losses	(1,091)	(2,928)
Fair value, Securities	225,795	164,779
U.S. sponsored entities [Member]
Schedule of securities available for sale portfolio
Amortized cost	617,158	694,674
Unrealized gains	33,021	37,636
Unrealized losses	(246)	(8)
Fair value, Securities	649,933	732,302
Private label [Member]
Schedule of securities available for sale portfolio
Amortized cost	4,139	8,964
Unrealized gains	177	241
Unrealized losses		(302)
Fair value, Securities	4,316	8,903
Subtotal mortgage-backed securities [Member]
Schedule of securities available for sale portfolio
Amortized cost	621,297	703,638
Unrealized gains	33,198	37,877
Unrealized losses	(246)	(310)
Fair value, Securities	$ 654,249	$ 741,205

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

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 14

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References+ Details

- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details