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Investment (Held-to-Maturity) Securities (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Amortized Cost $ 494,493,000 $ 427,594,000  
Investments Securities, Carrying Value 499,534,000 [1] 439,236,000 [2]  
Investment securities, fair value 528,458,000 462,657,000  
Investment Securities, Gross Unrealized Gain 29,427,000 [3] 25,193,000 [3]  
Investment Securities, Gross Unrealized Loss (503,000) [3] (1,772,000) [3]  
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]      
Investment Securities, Debt Maturities, Net Carrying Value 499,534,000    
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, Fair Value 528,458,000    
Investment Securities, Debt Maturities, Nominal Yield [Abstract]      
Investment Securities, Debt Maturities, Nominal Yield 3.88%    
Investment Securities, Pledged as Collateral [Abstract]      
Investment Securities, Pledged as Collateral, Carrying Value 117,346,000 197,192,000  
Investment Securities, Pledged as Collateral, Fair Value 121,647,000 200,006,000  
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 93,649,000 93,050,000  
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0  
Investment Securities, Continuous Unrealized Loss Position, Fair Value 93,649,000 93,050,000  
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 503,000 1,772,000  
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 0  
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses 503,000 1,772,000  
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 67 6  
Other than Temporary Impairment Losses, Investment Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Lowest Current Credit Rating [Abstract]      
Investment Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Carrying Value 82,767,000 [4]    
Investment Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 85,943,000 [4]    
Investment Securities, Portfolio Concentration Rated AAA to AA, Carrying Value 329,661,000    
Investment Securities, Portfolio Concentration Rated AAA to AA, Fair Value 352,856,000    
Investment Securities, Portfolio Concentration Rated A to BBB, Carrying Value 24,115,000    
Investment Securities, Portfolio Concentration Rated A to BBB, Fair Value 24,655,000    
Investment Securities, Portfolio Concentration Rated Below Investment Grade, Carrying Value 0    
Investment Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 0    
Investment Securities, Portfolio Concentration Not Rated, Carrying Value 62,991,000    
Investment Securities, Portfolio Concentration Not Rated, Fair Value 65,004,000    
Fixed Maturity Securities [Member]
     
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]      
Investment Securities, Debt Maturities, Next Rolling Twelve Months, Net Carrying Value 36,514,000    
Investment Securities, Debt Maturities, Rolling Year Two Through Five, Net Carrying Value 154,020,000    
Investment Securities, Debt Maturities, Rolling Year Six Through Ten, Net Carrying Value 114,700,000    
Investment Securities, Debt Maturities, Rolling after Ten Years, Net Carrying Value 111,533,000    
Investment Securities, Debt Maturities, Net Carrying Value 416,767,000    
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value 36,768,000    
Investment Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value 156,836,000    
Investment Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value 118,728,000    
Investment Securities, Debt Maturities, Rolling after Ten Years, Fair Value 130,183,000    
Investment Securities, Debt Maturities, Fair Value 442,515,000    
Investment Securities, Debt Maturities, Nominal Yield [Abstract]      
Investment Securities, Debt Maturities, Next Rolling Twelve Months, Nominal Yield 4.24%    
Investment Securities, Debt Maturities, Rolling Year Two Through Five, Nominal Yield 3.06%    
Investment Securities, Debt Maturities, Rolling Year Six Through Ten, Nominal Yield 3.41%    
Investment Securities, Debt Maturities, Rolling after Ten Years, Nominal Yield 6.25%    
Investment Securities, Debt Maturities, Nominal Yield 4.11%    
Investment Securities, Debt Maturities, Weighted Average Maturity 6.32 [5]    
Municipal and Other Tax-exempt Securities [Member]
     
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Amortized Cost 232,700,000 128,697,000  
Investments Securities, Carrying Value 232,700,000 [1] 128,697,000 [2]  
Investment securities, fair value 235,940,000 133,670,000  
Investment Securities, Gross Unrealized Gain 3,723,000 [3] 4,975,000 [3]  
Investment Securities, Gross Unrealized Loss (483,000) [3] (2,000) [3]  
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]      
Investment Securities, Debt Maturities, Next Rolling Twelve Months, Net Carrying Value 26,827,000    
Investment Securities, Debt Maturities, Rolling Year Two Through Five, Net Carrying Value 123,489,000    
Investment Securities, Debt Maturities, Rolling Year Six Through Ten, Net Carrying Value 79,569,000    
Investment Securities, Debt Maturities, Rolling after Ten Years, Net Carrying Value 2,815,000    
Investment Securities, Debt Maturities, Net Carrying Value 232,700,000    
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value 27,066,000    
Investment Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value 125,263,000    
Investment Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value 80,574,000    
Investment Securities, Debt Maturities, Rolling after Ten Years, Fair Value 3,037,000    
Investment Securities, Debt Maturities, Fair Value 235,940,000    
Investment Securities, Debt Maturities, Nominal Yield [Abstract]      
Investment Securities, Debt Maturities, Next Rolling Twelve Months, Nominal Yield 4.25% [6]    
Investment Securities, Debt Maturities, Rolling Year Two Through Five, Nominal Yield 2.51% [6]    
Investment Securities, Debt Maturities, Rolling Year Six Through Ten, Nominal Yield 2.45% [6]    
Investment Securities, Debt Maturities, Rolling after Ten Years, Nominal Yield 6.57% [6]    
Investment Securities, Debt Maturities, Nominal Yield 2.74% [6]    
Investment Securities, Debt Maturities, Weighted Average Maturity 4.01 [5]    
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 92,768,000 479,000  
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0  
Investment Securities, Continuous Unrealized Loss Position, Fair Value 92,768,000 479,000  
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 483,000 2,000  
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 0  
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses 483,000 2,000  
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 53 1  
Other than Temporary Impairment Losses, Investment Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Lowest Current Credit Rating [Abstract]      
Investment Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Carrying Value 0 [4]    
Investment Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 0 [4]    
Investment Securities, Portfolio Concentration Rated AAA to AA, Carrying Value 155,088,000    
Investment Securities, Portfolio Concentration Rated AAA to AA, Fair Value 155,945,000    
Investment Securities, Portfolio Concentration Rated A to BBB, Carrying Value 23,515,000    
Investment Securities, Portfolio Concentration Rated A to BBB, Fair Value 24,055,000    
Investment Securities, Portfolio Concentration Rated Below Investment Grade, Carrying Value 0    
Investment Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 0    
Investment Securities, Portfolio Concentration Not Rated, Carrying Value 54,097,000    
Investment Securities, Portfolio Concentration Not Rated, Fair Value 55,940,000    
Other Debt Securities [Member]
     
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Amortized Cost 184,067,000 188,835,000  
Investments Securities, Carrying Value 184,067,000 [1] 188,835,000 [2]  
Investment securities, fair value 206,575,000 208,451,000  
Investment Securities, Gross Unrealized Gain 22,528,000 [3] 19,616,000 [3]  
Investment Securities, Gross Unrealized Loss (20,000) [3] 0 [3]  
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]      
Investment Securities, Debt Maturities, Next Rolling Twelve Months, Net Carrying Value 9,687,000    
Investment Securities, Debt Maturities, Rolling Year Two Through Five, Net Carrying Value 30,531,000    
Investment Securities, Debt Maturities, Rolling Year Six Through Ten, Net Carrying Value 35,131,000    
Investment Securities, Debt Maturities, Rolling after Ten Years, Net Carrying Value 108,718,000    
Investment Securities, Debt Maturities, Net Carrying Value 184,067,000    
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value 9,702,000    
Investment Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value 31,573,000    
Investment Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value 38,154,000    
Investment Securities, Debt Maturities, Rolling after Ten Years, Fair Value 127,146,000    
Investment Securities, Debt Maturities, Fair Value 206,575,000    
Investment Securities, Debt Maturities, Nominal Yield [Abstract]      
Investment Securities, Debt Maturities, Next Rolling Twelve Months, Nominal Yield 4.22%    
Investment Securities, Debt Maturities, Rolling Year Two Through Five, Nominal Yield 5.30%    
Investment Securities, Debt Maturities, Rolling Year Six Through Ten, Nominal Yield 5.57%    
Investment Securities, Debt Maturities, Rolling after Ten Years, Nominal Yield 6.24%    
Investment Securities, Debt Maturities, Nominal Yield 5.85%    
Investment Securities, Debt Maturities, Weighted Average Maturity 9.24 [5]    
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 881,000    
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0    
Investment Securities, Continuous Unrealized Loss Position, Fair Value 881,000    
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 20,000    
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0    
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses 20,000    
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 14    
Other than Temporary Impairment Losses, Investment Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Lowest Current Credit Rating [Abstract]      
Investment Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Carrying Value 0 [4]    
Investment Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 0 [4]    
Investment Securities, Portfolio Concentration Rated AAA to AA, Carrying Value 174,573,000    
Investment Securities, Portfolio Concentration Rated AAA to AA, Fair Value 196,911,000    
Investment Securities, Portfolio Concentration Rated A to BBB, Carrying Value 600,000    
Investment Securities, Portfolio Concentration Rated A to BBB, Fair Value 600,000    
Investment Securities, Portfolio Concentration Rated Below Investment Grade, Carrying Value 0    
Investment Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 0    
Investment Securities, Portfolio Concentration Not Rated, Carrying Value 8,894,000    
Investment Securities, Portfolio Concentration Not Rated, Fair Value 9,064,000    
U.S. Agency Residential Mortgage-backed Securities [Member]
     
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]      
Investment Securities, Debt Maturities, Net Carrying Value 82,767,000    
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]      
Investment Securities, Debt Maturities, Fair Value 85,943,000    
Investment Securities, Debt Maturities, Nominal Yield [Abstract]      
Investment Securities, Debt Maturities, Nominal Yield 2.71% [7]    
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 3.4    
U.S. Agency Residential Mortgage-backed Securities [Member] | U.S. agency residental mortgage backed securities - Other [Member]
     
Schedule of Investment (Held-to-Maturity) Securities [Line Items]      
Investment Securities, Amortized Cost 77,726,000 110,062,000  
Investments Securities, Carrying Value 82,767,000 [1] 121,704,000 [2]  
Investment securities, fair value 85,943,000 120,536,000  
Investment Securities, Gross Unrealized Gain 3,176,000 [3] 602,000 [3]  
Investment Securities, Gross Unrealized Loss 0 [3] (1,770,000) [3]  
Investments Securities, Transfers [Abstract]      
Investment Securities, Transferred From Available For Sale Securities Portfolio, Fair Value     131,000,000
Investment Securities, Transferred From Available For Sale Securities Portfolio, Amortized Cost     118,000,000
Investment Securities, Transferred From Available For Sale Securities Portfolio, Net Unrealized Gain 5,000,000 12,000,000 13,000,000
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0 92,571,000  
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0  
Investment Securities, Continuous Unrealized Loss Position, Fair Value 0 92,571,000  
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]      
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 0 1,770,000  
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0 0  
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses 0 1,770,000  
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]      
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 0 5  
Other than Temporary Impairment Losses, Investment Securities, Portion Recognized in Earnings, Net, Qualitative Disclosures, Lowest Current Credit Rating [Abstract]      
Investment Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Carrying Value 82,767,000 [4]    
Investment Securities, Portfolio Concentration US Govt or GSE Securities Not Rated, Fair Value 85,943,000 [4]    
Investment Securities, Portfolio Concentration Rated AAA to AA, Carrying Value 0    
Investment Securities, Portfolio Concentration Rated AAA to AA, Fair Value 0    
Investment Securities, Portfolio Concentration Rated A to BBB, Carrying Value 0    
Investment Securities, Portfolio Concentration Rated A to BBB, Fair Value 0    
Investment Securities, Portfolio Concentration Rated Below Investment Grade, Carrying Value 0    
Investment Securities, Portfolio Concentration Rated Below Investment Grade, Fair Value 0    
Investment Securities, Portfolio Concentration Not Rated, Carrying Value 0    
Investment Securities, Portfolio Concentration Not Rated, Fair Value $ 0    
[1] Carrying value includes $5.0 million of net unrealized gain which remains in Accumulated other comprehensive income (“AOCI”) related to certain securities transferred from the Available for Sale securities portfolio to the Investment securities portfolio as discussed in greater detail following.
[2] Carrying value includes $12 million of net unrealized gain which remains in 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.
[3] Gross unrealized gains and losses are not recognized in AOCI in the Consolidated Balance Sheets.
[4] U.S. government and government sponsored enterprises are not rated by the nationally-recognized rating agencies as these securities are guaranteed by agencies of the U.S. government or government-sponsored enterprises.
[5] Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.
[6] Calculated on a taxable equivalent basis using a 39% effective tax rate.
[7] The nominal yield on residential mortgage-backed securities is based upon prepayment assumptions at the purchase date. Actual yields earned may differ significantly based upon actual prepayments. See Quarterly Financial Summary - Unaudited for current yields on the investment securities portfolio.