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SECURITIES (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
item
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
item
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Available for sale securities          
Amortized Cost $ 842,952   $ 842,952   $ 846,982
Gross Unrealized Gains 20,464   20,464   25,427
Gross Unrealized Losses (3,680)   (3,680)   (4,649)
Fair Value 859,736   859,736   867,760
Available for Sale, Amortized Cost          
Within one year 15,187   15,187    
One through five years 52,997   52,997    
Six through ten years 136,512   136,512    
After ten years 133,554   133,554    
Equity securities 4,689   4,689    
Total available for sale securities 842,952   842,952   846,982
Available for Sale, Fair Value          
Within one year 15,330   15,330    
One through five years 54,926   54,926    
Six through ten years 142,797   142,797    
After ten years 139,361   139,361    
Equity securities 4,689   4,689    
Fair Value 859,736   859,736   867,760
Available for sale securities          
Gross proceeds from sales of securities 43,497 $ 21,972 82,339 $ 21,972  
Gross gains realized on sales 1,060 542 1,312 542  
Gross losses realized on sales 997 $ 546 997 $ 546  
Securities in a continuous unrealized loss position with unrealized losses presented by length of time          
Less than 12 months, Fair Value 185,837   185,837   63,481
Less than 12 months, Unrealized Losses (2,139)   (2,139)   (313)
12 months or longer, Fair Value 68,143   68,143   195,975
12 months or longer, Unrealized Losses (1,541)   (1,541)   (4,336)
Total Fair Value 253,980   253,980   259,456
Total Unrealized Losses $ (3,680)   $ (3,680)   (4,649)
Other-Than-Temporary-Impairment          
Number of general segments segregated in investment securities portfolio | item     2    
Number of security in the portfolio | item     999    
Number of portfolio security in unrealized loss position | item 188   188    
Decline in fair value of security attributable to change in interest rates and illiquidity     $ 580    
U. S. government agency          
Available for sale securities          
Amortized Cost $ 573   573   652
Gross Unrealized Gains 8   8   10
Gross Unrealized Losses (1)   (1)   (1)
Fair Value 580   580   661
Available for Sale, Amortized Cost          
Total available for sale securities 573   573   652
Available for Sale, Fair Value          
Fair Value 580   580   661
Securities in a continuous unrealized loss position with unrealized losses presented by length of time          
Less than 12 months, Fair Value 769   769   122
Less than 12 months, Unrealized Losses (1)   (1)   (1)
Total Fair Value 769   769   122
Total Unrealized Losses (1)   (1)   (1)
State and municipal          
Available for sale securities          
Amortized Cost 335,150   335,150   316,048
Gross Unrealized Gains 15,404   15,404   18,603
Gross Unrealized Losses (1,247)   (1,247)   (353)
Fair Value 349,307   349,307   334,298
Available for Sale, Amortized Cost          
Total available for sale securities 335,150   335,150   316,048
Available for Sale, Fair Value          
Fair Value 349,307   349,307   334,298
Securities in a continuous unrealized loss position with unrealized losses presented by length of time          
Less than 12 months, Fair Value 66,024   66,024   16,659
Less than 12 months, Unrealized Losses (1,163)   (1,163)   (147)
12 months or longer, Fair Value 1,630   1,630   13,340
12 months or longer, Unrealized Losses (84)   (84)   (206)
Total Fair Value 67,654   67,654   29,999
Total Unrealized Losses (1,247)   (1,247)   (353)
Mortgage-backed securities-residential (Government Sponsored Entity)          
Available for sale securities          
Amortized Cost 233,746   233,746   178,534
Gross Unrealized Gains 2,198   2,198   4,071
Gross Unrealized Losses (580)   (580)   (433)
Fair Value 235,364   235,364   182,172
Available for Sale, Amortized Cost          
Debt securities without single maturity date 233,746   233,746    
Total available for sale securities 233,746   233,746   178,534
Available for Sale, Fair Value          
Debt securities without single maturity date 235,364   235,364    
Fair Value 235,364   235,364   182,172
Securities in a continuous unrealized loss position with unrealized losses presented by length of time          
Less than 12 months, Fair Value 71,000   71,000   24,925
Less than 12 months, Unrealized Losses (580)   (580)   (51)
12 months or longer, Fair Value         32,541
12 months or longer, Unrealized Losses         (382)
Total Fair Value 71,000   71,000   57,466
Total Unrealized Losses (580)   (580)   (433)
Collateralized mortgage obligations (Government Sponsored Entity)          
Available for sale securities          
Amortized Cost 266,267   266,267   344,556
Gross Unrealized Gains 2,854   2,854   2,743
Gross Unrealized Losses (1,852)   (1,852)   (3,862)
Fair Value 267,269   267,269   343,437
Other than temporary impairment on available for sale securities     0    
Available for Sale, Amortized Cost          
Debt securities without single maturity date 266,267   266,267    
Total available for sale securities 266,267   266,267   344,556
Available for Sale, Fair Value          
Debt securities without single maturity date 267,269   267,269    
Fair Value 267,269   267,269   343,437
Securities in a continuous unrealized loss position with unrealized losses presented by length of time          
Less than 12 months, Fair Value 48,044   48,044   21,775
Less than 12 months, Unrealized Losses (395)   (395)   (114)
12 months or longer, Fair Value 66,513   66,513   150,094
12 months or longer, Unrealized Losses (1,457)   (1,457)   (3,748)
Total Fair Value 114,557   114,557   171,869
Total Unrealized Losses (1,852)   (1,852)   (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 2,527   2,527   2,503
Fair Value 2,527   2,527   2,503
Available for Sale, Amortized Cost          
Total available for sale securities 2,527   2,527   2,503
Available for Sale, Fair Value          
Fair Value $ 2,527   $ 2,527   $ 2,503