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Investment securities and impairment of investment securities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Amortized cost    
Total $ 1,084,596 $ 1,053,122
Gross unrealized holding gains    
Total 23,546 30,279
Gross unrealized holding losses    
Total (15,343) (4,327)
Fair value    
Total 1,092,799 1,079,074
Non-agency CMOs
   
Fair value    
Total 4,953  
Debt issued by the U.S. government and agencies
   
Amortized cost    
Due in one year or less 34 40
Fair value    
Due in one year or less 34 40
Debt issued by government sponsored enterprises
   
Amortized cost    
Due in one year or less 2,000 1,999
Due in one year - five years 223,122 140,352
Due in five years - ten years 101,190 95,602
Gross unrealized holding gains    
Due in one year or less 1 5
Due in one year - five years 268 183
Due in five years - ten years   460
Gross unrealized holding losses    
Due in one year - five years (3,270) (22)
Due in five years - ten years (2,198) (265)
Fair value    
Due in one year or less 2,001 2,004
Due in one year - five years 220,120 140,513
Due in five years - ten years 98,992 95,797
Equity securities
   
Amortized cost    
Total 15,527 13,301
Gross unrealized holding gains    
Total 10,838 6,025
Gross unrealized holding losses    
Total (37) (22)
Fair value    
Total 26,328 19,304
Municipal securities
   
Amortized cost    
Due in one year or less 435  
Due in one year - five years 9,344 9,629
Due in five years - ten years 14,582 17,355
Due after ten years 82,994 100,644
Gross unrealized holding gains    
Due in one year or less 12  
Due in one year - five years 156 233
Due in five years - ten years 360 668
Due after ten years 1,581 5,679
Gross unrealized holding losses    
Due after ten years (217)  
Fair value    
Due in one year or less 447  
Due in one year - five years 9,500 9,862
Due in five years - ten years 14,942 18,023
Due after ten years 84,358 106,323
Corporate debt issues
   
Amortized cost    
Due after ten years 21,853 24,911
Gross unrealized holding gains    
Due after ten years 718 483
Gross unrealized holding losses    
Due after ten years (1,839) (2,691)
Fair value    
Due after ten years 20,732 22,703
Residential mortgage-backed securities
   
Amortized cost    
Total 613,515 649,289
Gross unrealized holding gains    
Total 9,612 16,543
Gross unrealized holding losses    
Total (7,782) (1,327)
Fair value    
Total 615,345 664,505
Fixed rate | Pass-through
   
Amortized cost    
Total 88,960 85,134
Gross unrealized holding gains    
Total 3,539 6,266
Gross unrealized holding losses    
Total (995)  
Fair value    
Total 91,504 91,400
Fixed rate | Non-agency CMOs
   
Amortized cost    
Total 4,123 5,700
Gross unrealized holding gains    
Total 153 156
Gross unrealized holding losses    
Total   (236)
Fair value    
Total 4,276 5,620
Fixed rate | Agency CMOs
   
Amortized cost    
Total 278,308 227,608
Gross unrealized holding gains    
Total 1,555 3,462
Gross unrealized holding losses    
Total (6,509) (744)
Fair value    
Total 273,354 230,326
Variable rate | Pass-through
   
Amortized cost    
Total 84,278 104,591
Gross unrealized holding gains    
Total 3,685 5,314
Gross unrealized holding losses    
Total (15) (6)
Fair value    
Total 87,948 109,899
Variable rate | Non-agency CMOs
   
Amortized cost    
Total 696 873
Gross unrealized holding losses    
Total (19) (20)
Fair value    
Total 677 853
Variable rate | Agency CMOs
   
Amortized cost    
Total 157,150 225,383
Gross unrealized holding gains    
Total 680 1,345
Gross unrealized holding losses    
Total (244) (321)
Fair value    
Total $ 157,586 $ 226,407