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Securities, Available-for-sale (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Available-for-sale securities, continuous unrealized loss position [Abstract]              
Investments with an Unrealized Loss of less than 12 months, Fair Value $ 142,581,000       $ 142,581,000 $ 49,017,000  
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses 1,176,000       1,176,000 367,000  
Investments with an Unrealized Loss of 12 months or longer, Fair Value 0       0 19,031,000  
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses 0       0 35,000  
Total Investments with an Unrealized Loss, Fair Value 142,581,000       142,581,000 68,048,000  
Total Investments with an Unrealized Loss, Unrealized Losses 1,176,000       1,176,000 402,000  
Available-for-sale securities, gross realized gain (loss) [Abstract]              
Fair Value of securities sold 153,166,000 [1] 2,791,000 [2] 18,273,000 [3] 14,360,000 [4]      
Realized gain 2,068,000 7,000 99,000 148,000      
Realized loss 0 0 0 0      
Net 2,068,000 7,000 99,000 148,000 2,150,605 960,763 2,623,674
Other-than-temporary impairment 80,000 [5] 57,000 [2] 0 34,000 [6]      
Recognized gain on the sale of securities, net 1,988,000 (50,000) 99,000 114,000      
Debt, Weighted Average Interest Rate       0.50%      
Number of securities deemed other-than-temporarily impaired   1 2        
Number of bonds sold based on their relative underperformance compared to expectations 30            
U.S. Government Agency Securities [Member]
             
Available-for-sale securities, continuous unrealized loss position [Abstract]              
Investments with an Unrealized Loss of less than 12 months, Fair Value 78,899,000       78,899,000 5,452,000  
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses 414,000       414,000 9,000  
Investments with an Unrealized Loss of 12 months or longer, Fair Value 0       0 0  
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses 0       0 0  
Total Investments with an Unrealized Loss, Fair Value 78,899,000       78,899,000 5,452,000  
Total Investments with an Unrealized Loss, Unrealized Losses 414,000       414,000 9,000  
Mortgage-backed Securities [Member]
             
Available-for-sale securities, continuous unrealized loss position [Abstract]              
Investments with an Unrealized Loss of less than 12 months, Fair Value 40,988,000       40,988,000 41,598,000  
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses 623,000       623,000 341,000  
Investments with an Unrealized Loss of 12 months or longer, Fair Value 0       0 17,826,000  
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses 0       0 30,000  
Total Investments with an Unrealized Loss, Fair Value 40,988,000       40,988,000 59,424,000  
Total Investments with an Unrealized Loss, Unrealized Losses 623,000       623,000 371,000  
Available-for-sale securities, gross realized gain (loss) [Abstract]              
Number of securities deemed other-than-temporarily impaired 4            
State and Municipal Securities [Member]
             
Available-for-sale securities, continuous unrealized loss position [Abstract]              
Investments with an Unrealized Loss of less than 12 months, Fair Value 5,179,000       5,179,000 1,967,000  
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses 126,000       126,000 17,000  
Investments with an Unrealized Loss of 12 months or longer, Fair Value 0       0 1,205,000  
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses 0       0 5,000  
Total Investments with an Unrealized Loss, Fair Value 5,179,000       5,179,000 3,172,000  
Total Investments with an Unrealized Loss, Unrealized Losses 126,000       126,000 22,000  
Asset-backed Securities [Member]
             
Available-for-sale securities, continuous unrealized loss position [Abstract]              
Investments with an Unrealized Loss of less than 12 months, Fair Value 17,353,000       17,353,000    
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses 9,000       9,000    
Total Investments with an Unrealized Loss, Fair Value 17,353,000       17,353,000    
Total Investments with an Unrealized Loss, Unrealized Losses 9,000       9,000    
Available-for-sale securities, gross realized gain (loss) [Abstract]              
Recognized gain on the sale of securities, net   7,000          
Number of securities deemed other-than-temporarily impaired     4 4      
Corporate Notes [Member]
             
Available-for-sale securities, continuous unrealized loss position [Abstract]              
Investments with an Unrealized Loss of less than 12 months, Fair Value 162,000       162,000 0  
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses 4,000       4,000 0  
Investments with an Unrealized Loss of 12 months or longer, Fair Value 0       0 0  
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses 0       0 0  
Total Investments with an Unrealized Loss, Fair Value 162,000       162,000 0  
Total Investments with an Unrealized Loss, Unrealized Losses $ 4,000       $ 4,000 $ 0  
[1] During the fourth quarter of 2012, Pinnacle Financial decided to sell thirty bonds based on their relative underperformance compared to expectations.
[2] During the third quarter of 2012, Pinnacle Financial determined one security was OTTI due to its distinct underperformance relative to the interest rate environment. Pinnacle Financial recognized approximately $57,000 in OTTI and the bond was subsequently sold for a gain of approximately $7,000.
[3] During the second quarter of 2012, Pinnacle Financial sold the four securities previously identified as OTTI in the first quarter. Additionally, two securities issued by municipalities in the state of California, which management believed could be adversely affected by state budgetary issues, were also sold during the second quarter.
[4] During the first quarter of 2012, Pinnacle Financial sold these securities due to their relatively short terms until maturity and a weighted average coupon of 0.50%.
[5] During the fourth quarter, Pinnacle Financial determined four mortgage-backed securities were OTTI because of management's intent to sell them in the fourth quarter. The decision to sell was based on their relative underperformance compared to expectations.
[6] During the first quarter of 2012, Pinnacle Financial determined four mortgage-backed securities were OTTI because of management's intent to sell them in the second quarter of 2012. The decision to sell was based on their relative underperformance compared to expectations.