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Securities (Securities Pooled Trust Preferred Unrealized Losses (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Amortized Cost Basis $ 309,421   $ 309,421   $ 363,408
Available for sale debt securities fair value 316,714   316,714    
Available for sale securities unrealized losses (6,531)   (6,531)   (9,119)
Additional increases to the amount of credit-related impairment loss on debt securities for which other-than-temporary impairment was previously recognized 0 0 2,772 209  
Trust preferred securities: Collateralized debt obligations [Member]
         
Schedule of Available-for-sale Securities [Line Items]          
Available for sale debt securities amortized cost 1,264   1,264   4,036
Available for sale debt securities fair value 397   397   843
Available for sale securities unrealized losses (867)   (867)   (3,193)
Nonaccrual Investment Security [Member] | Trust preferred securities: Collateralized debt obligations [Member]
         
Schedule of Available-for-sale Securities [Line Items]          
Available for sale debt securities amortized cost 1,264 [1]   1,264 [1]   4,036 [1]
Available for sale debt securities fair value 397   397   843
Available for sale securities unrealized losses (867)   (867)   (3,193)
Tropic CDO1, tranche A4L [Member] | Nonaccrual Investment Security [Member] | Trust preferred securities: Collateralized debt obligations [Member]
         
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Amortized Cost Basis 0 [1]   0 [1]   2,772 [1]
Securities available for sale 0   0   613
Available for sale securities unrealized losses 0   0   (2,159)
Additional increases to the amount of credit-related impairment loss on debt securities for which other-than-temporary impairment was previously recognized     2,772    
Other Than Temporary Impairment Credit Losses Previously Recognized In Earnings     2,096    
Preferred Term Security [PreTSL] XXV, tranche C1 [Member] | Nonaccrual Investment Security [Member] | Trust preferred securities: Collateralized debt obligations [Member]
         
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Amortized Cost Basis 1,264 [1]   1,264 [1]   1,264 [1]
Securities available for sale 397   397   230
Available for sale securities unrealized losses (867)   (867)   (1,034)
Other Than Temporary Impairment Credit Losses Previously Recognized In Earnings     $ 1,200    
[1] Net of other-than-temporary impairment losses recognized in earnings.