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Securities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
item
Dec. 31, 2012
Securities available-for-sale:    
Amortized Cost - Securities available-for-sale $ 337,180 $ 356,106
Gross Unrealized Gains 9,863 11,892
Gross Unrealized Losses (243) (86)
Estimated Fair Value 346,800 367,912
Securities held-to-maturity:    
Amortized Cost - Securities held-to-maturity 68,283 51,472
Gross Unrealized Gains 7 82
Gross Unrealized Losses (2,631) (590)
Estimated Fair Value 65,659 50,964
Additional information    
Number of securities held 320 269
Number of available-for-sale securities held 169 168
Number of held to maturity securities held 151 101
Number of securities with fair values below amortized cost 143 70
Number of securities carried with an unrealized loss for over twelve months 0 0
Agency mortgage-backed securities
   
Securities available-for-sale:    
Amortized Cost - Securities available-for-sale 262,710 281,598
Gross Unrealized Gains 8,444 9,668
Gross Unrealized Losses (77) (22)
Estimated Fair Value 271,077 291,244
Securities held-to-maturity:    
Amortized Cost - Securities held-to-maturity 15,185 16,659
Gross Unrealized Gains 6 2
Gross Unrealized Losses (298) (177)
Estimated Fair Value 14,893 16,484
Additional information    
Holdings of securities as percentage of shareholders' equity, considered as threshold for disclosure purpose 10.00%  
Number of securities held 0  
Corporate bonds
   
Securities available-for-sale:    
Amortized Cost - Securities available-for-sale 53,681 53,739
Gross Unrealized Gains 1,269 1,849
Gross Unrealized Losses (58)  
Estimated Fair Value 54,892 55,588
Trust preferred securities
   
Securities available-for-sale:    
Amortized Cost - Securities available-for-sale 20,789 20,769
Gross Unrealized Gains 150 375
Gross Unrealized Losses (108) (64)
Estimated Fair Value 20,831 21,080
Municipals - Tax exempt
   
Securities held-to-maturity:    
Amortized Cost - Securities held-to-maturity 53,098 34,813
Gross Unrealized Gains 1 80
Gross Unrealized Losses (2,333) (413)
Estimated Fair Value $ 50,766 $ 34,480