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Fair Value Measurement (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount for selling costs (in hundredths) 10.00%  
Available-for-sale Securities [Abstract]    
Available-for-sale securities $ 387,786 $ 424,617 [1]
Financial Assets [Abstract]    
Securities available-for-sale 387,786 424,617 [1]
Carrying Value [Member]
   
Available-for-sale Securities [Abstract]    
Available-for-sale securities 387,786 424,617
Financial Assets [Abstract]    
Cash and cash equivalents 118,009 73,573
Time deposits held in banks   881
Securities available-for-sale 387,786 424,617
Securities held-to-maturity 167,617 153,524
Other investments 10,017 8,310
Loans, net 1,030,402 1,039,570
Cash surrender value of life insurance policies 13,242 13,183
Financial liabilities [Abstract]    
Non-interest-bearing deposits 390,774 380,577
Interest-bearing deposits 1,169,352 1,171,347
Securities sold under agreements to repurchase 48,557 41,447
Notes payable 28,772 29,128
Junior subordinated debentures 29,384 29,384
Minimum [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Period when new appraisals are received (in weeks) 4  
Maximum [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Period when new appraisals are received (in weeks) 6  
Level 1 [Member] | Fair Value [Member]
   
Available-for-sale Securities [Abstract]    
Available-for-sale securities 0 0
Financial Assets [Abstract]    
Cash and cash equivalents 118,009 73,573
Time deposits held in banks   0
Securities available-for-sale 0 0
Securities held-to-maturity 0 0
Other investments 10,017 8,310
Loans, net 0 0
Cash surrender value of life insurance policies 0 0
Financial liabilities [Abstract]    
Non-interest-bearing deposits 0 0
Interest-bearing deposits 0 0
Securities sold under agreements to repurchase 48,557 41,447
Notes payable   0
Junior subordinated debentures 0 0
Level 2 [Member] | Fair Value [Member]
   
Available-for-sale Securities [Abstract]    
Available-for-sale securities 387,786 424,617
Financial Assets [Abstract]    
Cash and cash equivalents 0 0
Time deposits held in banks   0
Securities available-for-sale 387,786 424,617
Securities held-to-maturity 170,177 156,924
Other investments 0 0
Loans, net 0 0
Cash surrender value of life insurance policies 13,242 13,183
Financial liabilities [Abstract]    
Non-interest-bearing deposits 390,774 380,557
Interest-bearing deposits 899,237 859,183
Securities sold under agreements to repurchase 0 0
Notes payable   0
Junior subordinated debentures 22,167 22,167
Level 3 [Member] | Fair Value [Member]
   
Available-for-sale Securities [Abstract]    
Available-for-sale securities 0 0
Financial Assets [Abstract]    
Cash and cash equivalents 0 0
Time deposits held in banks   883
Securities available-for-sale 0 0
Securities held-to-maturity 0 0
Other investments 0 0
Loans, net 1,036,325 1,046,495
Cash surrender value of life insurance policies 0 0
Financial liabilities [Abstract]    
Non-interest-bearing deposits 0 0
Interest-bearing deposits 271,799 314,783
Securities sold under agreements to repurchase 0 0
Notes payable 28,772 29,128
Junior subordinated debentures 7,588 7,776
Fair Value, Measurements, Recurring [Member]
   
Available-for-sale Securities [Abstract]    
U.S. Government sponsored enterprises 13,186 13,424
Obligations of state and political subdivisions 77,179 87,421
GSE mortgage-backed securities 167,320 178,819
Other asset-backed securities 12,628  
Collateralized mortgage obligations: residential 87,253 101,986
Collateralized mortgage obligations: commercial 29,693 29,761
Other asset-backed securities   12,742
Collateralized debt obligation 527 464
Available-for-sale securities 387,786 424,617
Financial Assets [Abstract]    
Securities available-for-sale 387,786 424,617
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
   
Available-for-sale Securities [Abstract]    
U.S. Government sponsored enterprises 0 0
Obligations of state and political subdivisions 0 0
GSE mortgage-backed securities 0 0
Other asset-backed securities 0  
Collateralized mortgage obligations: residential   0
Collateralized mortgage obligations: commercial 0  
Other asset-backed securities   0
Collateralized debt obligation 0 0
Available-for-sale securities 0 0
Financial Assets [Abstract]    
Securities available-for-sale 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
   
Available-for-sale Securities [Abstract]    
U.S. Government sponsored enterprises 13,186 13,424
Obligations of state and political subdivisions 77,179 87,421
GSE mortgage-backed securities 167,320 178,819
Other asset-backed securities 12,628  
Collateralized mortgage obligations: residential 87,253 101,986
Collateralized mortgage obligations: commercial 29,693 29,761
Other asset-backed securities   12,742
Collateralized debt obligation 527 464
Available-for-sale securities 387,786 424,617
Financial Assets [Abstract]    
Securities available-for-sale 387,786 424,617
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
   
Available-for-sale Securities [Abstract]    
U.S. Government sponsored enterprises 0 0
Obligations of state and political subdivisions 0 0
GSE mortgage-backed securities 0 0
Other asset-backed securities 0  
Collateralized mortgage obligations: residential   0
Collateralized mortgage obligations: commercial 0  
Other asset-backed securities   0
Collateralized debt obligation 0 0
Available-for-sale securities 0 0
Financial Assets [Abstract]    
Securities available-for-sale 0 0
Fair Value, Measurements, Nonrecurring [Member]
   
Assets and Liabilities Measured on Nonrecurring Basis    
Acquired loans with deteriorated credit quality 4,254 4,521
Other real estate 7,552 7,496
Impaired loans, excluding acquired loans 1,943 2,245
Total 13,749 14,262
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
   
Assets and Liabilities Measured on Nonrecurring Basis    
Acquired loans with deteriorated credit quality 0 0
Other real estate 0 0
Impaired loans, excluding acquired loans 0  
Total 0 0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]
   
Assets and Liabilities Measured on Nonrecurring Basis    
Acquired loans with deteriorated credit quality 0 0
Other real estate 7,552 7,496
Impaired loans, excluding acquired loans 1,943 2,245
Total 9,495 9,741
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
   
Assets and Liabilities Measured on Nonrecurring Basis    
Acquired loans with deteriorated credit quality 4,254 4,521
Other real estate 0 0
Impaired loans, excluding acquired loans 0 0
Total $ 4,254 $ 4,521
[1] Derived from audited financial statements