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Securities Part 1 (Details) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Trading Securities [Abstract]   
Fair Value, trading securities$ 109,659,000$ 55,467,000$ 82,247,000
Held-to-Maturity [Abstract]   
Carrying Value452,652,000[1]  
Amortized Cost439,653,000339,553,000343,748,000
Investments securities, fair value483,234,000346,105,000358,340,000
Not Recognized in OCI Gross Unrealized Gain30,801,0008,417,000[2]14,735,000[2]
Not Recognized in OCI Gross Unrealized Loss(219,000)[3](1,865,000)[3](143,000)[3]
Net Unrealized Gain (Loss) on Securities transferred from Available for Sale securities portfolio to the Investment securities portfolio13,000,000  
Fair Value of Securities transferred from Available for Sale securities portfolio to the Investment securities portfolio131,000,000  
Amortized cost of Securities transferred from Available for Sale securities portfolio to the Investment securities portfolio118,000,000  
Trading Securities [Member]
   
Trading Securities [Abstract]   
Fair Value, trading securities109,659,00055,467,00082,247,000
Net Unrealized Gain (Loss)(241,000)59,000(233,000)
Trading Securities [Member] | Municipal And Other Tax Exempt Securities [Member]
   
Trading Securities [Abstract]   
Fair Value, trading securities57,431,00023,396,00043,438,000
Net Unrealized Gain (Loss)(100,000)(214,000)(290,000)
Trading Securities [Member] | Obligations of the U. S. Government [Member]
   
Trading Securities [Abstract]   
Fair Value, trading securities1,839,0003,873,00016,220,000
Net Unrealized Gain (Loss)(43,000)(17,000)(19,000)
Trading Securities [Member] | Other trading securities [Member]
   
Trading Securities [Abstract]   
Fair Value, trading securities888,000927,0004,219,000
Net Unrealized Gain (Loss)(1,000)(2,000)23,000
Trading Securities [Member] | US Government Agencies Debt Securities [Member]
   
Trading Securities [Abstract]   
Fair Value, trading securities49,501,00027,271,00018,370,000
Net Unrealized Gain (Loss)(97,000)292,00053,000
Municipal And Other Tax Exempt Securities [Member]
   
Held-to-Maturity [Abstract]   
Carrying Value133,394,000[1]  
Amortized Cost133,394,000184,898,000187,608,000
Investments securities, fair value138,461,000188,577,000194,051,000
Not Recognized in OCI Gross Unrealized Gain5,067,000[2]3,912,000[2]6,443,000[2]
Not Recognized in OCI Gross Unrealized Loss0[3](233,000)[3]0[3]
Residential Mortgage Backed Securities [Member]
   
Held-to-Maturity [Abstract]   
Carrying Value130,668,000[1]  
Amortized Cost117,669,00000
Investments securities, fair value130,614,00000
Not Recognized in OCI Gross Unrealized Gain165,00000
Not Recognized in OCI Gross Unrealized Loss(219,000)[3]0[3]0[3]
Other Debt Obligations [Member]
   
Held-to-Maturity [Abstract]   
Carrying Value188,590,000[1]  
Amortized Cost188,590,000154,655,000156,140,000
Investments securities, fair value214,159,000157,528,000164,289,000
Not Recognized in OCI Gross Unrealized Gain25,569,000[2]4,505,000[2]8,292,000[2]
Not Recognized in OCI Gross Unrealized Loss0[3](1,632,000)[3](143,000)[3]
Fixed Maturities Securities [Member]
   
Held-to-Maturity [Abstract]   
Amortized Cost321,984,000  
Investments securities, fair value$ 352,620,000  
[1]Carrying value includes $13 million of net unrealized gain which remains in Accumulated other comprehensive income ("AOCI") in the Consolidated Balance Sheets related to certain securities transferred from the Available for Sale securities portfolio to the Investment securities portfolio as discussed in greater detail following.
[2]Other Comprehensive income
[3]Gross unrealized gains and losses are not recognized in AOCI in the Consolidated Balance Sheets.