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SECURITIES (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
item
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
item
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Available for sale securities          
Amortized Cost $ 886,036   $ 886,036   $ 846,982
Gross Unrealized Gains 24,646   24,646   25,427
Gross Unrealized Losses (1,184)   (1,184)   (4,649)
Fair Value 909,498   909,498   867,760
Available for Sale, Amortized Cost          
Within one year 16,091   16,091    
One through five years 49,709   49,709    
Six through ten years 129,057   129,057    
After ten years 140,663   140,663    
Equity securities 4,689   4,689    
Total available for sale securities 886,036   886,036   846,982
Available for Sale, Fair Value          
Within one year 16,238   16,238    
One through five years 51,860   51,860    
Six through ten years 136,194   136,194    
After ten years 147,592   147,592    
Equity securities 4,689   4,689    
Fair Value 909,498   909,498   867,760
Available for sale securities          
Gross proceeds from sales of securities 57,208 $ 0 139,547 $ 21,972  
Gross gains realized on sales 203 0 1,515 542  
Gross losses realized on sales 158 $ 0 1,155 $ 546  
Securities in a continuous unrealized loss position with unrealized losses presented by length of time          
Less than 12 months, Fair Value 60,436   60,436   63,481
Less than 12 months, Unrealized Losses (343)   (343)   (313)
12 months or longer, Fair Value 60,624   60,624   195,975
12 months or longer, Unrealized Losses (841)   (841)   (4,336)
Total Fair Value 121,060   121,060   259,456
Total Unrealized Losses $ (1,184)   $ (1,184)   (4,649)
Other-Than-Temporary-Impairment          
Number of general segments segregated in investment securities portfolio | item     2    
Number of security in the portfolio | item     977    
Number of portfolio security in unrealized loss position | item 83   83    
Decline in fair value of security attributable to change in interest rates and illiquidity     $ 2    
U. S. government agency          
Available for sale securities          
Amortized Cost $ 533   533   652
Gross Unrealized Gains 10   10   10
Gross Unrealized Losses         (1)
Fair Value 543   543   661
Available for Sale, Amortized Cost          
Total available for sale securities 533   533   652
Available for Sale, Fair Value          
Fair Value 543   543   661
Securities in a continuous unrealized loss position with unrealized losses presented by length of time          
Less than 12 months, Fair Value         122
Less than 12 months, Unrealized Losses         (1)
Total Fair Value         122
Total Unrealized Losses         (1)
State and municipal          
Available for sale securities          
Amortized Cost 332,462   332,462   316,048
Gross Unrealized Gains 16,613   16,613   18,603
Gross Unrealized Losses (259)   (259)   (353)
Fair Value 348,816   348,816   334,298
Available for Sale, Amortized Cost          
Total available for sale securities 332,462   332,462   316,048
Available for Sale, Fair Value          
Fair Value 348,816   348,816   334,298
Securities in a continuous unrealized loss position with unrealized losses presented by length of time          
Less than 12 months, Fair Value 31,492   31,492   16,659
Less than 12 months, Unrealized Losses (234)   (234)   (147)
12 months or longer, Fair Value 309   309   13,340
12 months or longer, Unrealized Losses (25)   (25)   (206)
Total Fair Value 31,801   31,801   29,999
Total Unrealized Losses (259)   (259)   (353)
Mortgage-backed securities-residential (Government Sponsored Entity)          
Available for sale securities          
Amortized Cost 299,294   299,294   178,534
Gross Unrealized Gains 4,553   4,553   4,071
Gross Unrealized Losses (2)   (2)   (433)
Fair Value 303,845   303,845   182,172
Available for Sale, Amortized Cost          
Debt securities without single maturity date 299,294   299,294    
Total available for sale securities 299,294   299,294   178,534
Available for Sale, Fair Value          
Debt securities without single maturity date 303,845   303,845    
Fair Value 303,845   303,845   182,172
Securities in a continuous unrealized loss position with unrealized losses presented by length of time          
Less than 12 months, Fair Value 4,949   4,949   24,925
Less than 12 months, Unrealized Losses (2)   (2)   (51)
12 months or longer, Fair Value         32,541
12 months or longer, Unrealized Losses         (382)
Total Fair Value 4,949   4,949   57,466
Total Unrealized Losses (2)   (2)   (433)
Collateralized mortgage obligations (Government Sponsored Entity)          
Available for sale securities          
Amortized Cost 246,533   246,533   344,556
Gross Unrealized Gains 3,470   3,470   2,743
Gross Unrealized Losses (923)   (923)   (3,862)
Fair Value 249,080   249,080   343,437
Other than temporary impairment on available for sale securities     0    
Available for Sale, Amortized Cost          
Debt securities without single maturity date 246,533   246,533    
Total available for sale securities 246,533   246,533   344,556
Available for Sale, Fair Value          
Debt securities without single maturity date 249,080   249,080    
Fair Value 249,080   249,080   343,437
Securities in a continuous unrealized loss position with unrealized losses presented by length of time          
Less than 12 months, Fair Value 23,995   23,995   21,775
Less than 12 months, Unrealized Losses (107)   (107)   (114)
12 months or longer, Fair Value 60,315   60,315   150,094
12 months or longer, Unrealized Losses (816)   (816)   (3,748)
Total Fair Value 84,310   84,310   171,869
Total Unrealized Losses (923)   (923)   (3,862)
Equity securities          
Available for sale securities          
Amortized Cost 4,689   4,689   4,689
Fair Value 4,689   4,689   4,689
Available for Sale, Amortized Cost          
Total available for sale securities 4,689   4,689   4,689
Available for Sale, Fair Value          
Fair Value 4,689   4,689   4,689
Other securities          
Available for sale securities          
Amortized Cost 2,525   2,525   2,503
Fair Value 2,525   2,525   2,503
Available for Sale, Amortized Cost          
Total available for sale securities 2,525   2,525   2,503
Available for Sale, Fair Value          
Fair Value $ 2,525   $ 2,525   $ 2,503